3176B, C-10, C-12 & 3406E TRUCK ENGINES Caterpillar

Many programmable parameters affect 3176B, C-10, C-12, and 3406E Engine operation. These parameters may be changed using electronic service tools. The parameters are stored in the ECM, not the personality module. Any parameter can be read, however, passwords protect parameters from unauthorized changes.

Two categories contain various parameters, System Configuration Parameters and Customer Specified Parameters. System Configuration Parameters can be altered only with the proper factory passwords using an Electronic Control Analyzer Programmer (ECAP) or Caterpillar Electronic Technician (ET).

Customer Specified Parameters can be changed using an Electronic Service Tool only with the proper customer passwords. See the following section on passwords for more details on how to receive and use factory and customer passwords.

NOTE: For details on how to read and change parameters using an ECAP, refer to Special Instruction SEHS8886 (if using the NEXG4522 Truck Engine Functions Service Program Module set).

Connecting an Electronic Service Tool

The Electronic Control Analyzer Programmer (ECAP) and the Communications Adapter are powered by 12 volts DC from the vehicle battery. This permits operation beside the engine or in the cab of a truck, to allow use during vehicle operation.

Use the following procedures to connect the service tool to the engine.

1. Turn ignition key to the OFF position.

2. The Service Tool should be connected to the 3176B, C-10, C-12, and 3406E system through the Cab Data Link connector. Determine the necessary Adapter Harness Assembly (8-Pin Amp Connector 7X1403, 6-Pin Deutsch Connector 7X1686) from the tool list for the vehicle you are working with. Connect the appropriate adapter to the 8T5275 (or 139-4166) Breakout T harness connector cable.

3. Connect the opposite end of the Breakout T cable to the Service Tool.

4. Turn ignition key to the ON position to begin testing. The Service Tool will operate with the engine running, or with the engine OFF, ignition key ON. If the Tool does not communicate with the ECM, refer to "PB-23: ATA (SAE J1587/1708) Data Link Circuit Test" on page 209.

NOTE: The Service Tool may restart during engine cranking due to a voltage dip on the battery line.

System Configuration Parameters

System Configuration Parameters affect emissions or power of the engine. They are programmed at the factory and would normally never need to be changed through the life of the engine. System Configuration Parameters must be reprogrammed if an ECM is replaced, but not if the Personality Module is replaced (unless the engine rating changes). Proper values for these parameters are stamped on the engine information ratings plate located on the valve cover or intake manifold. Factory Passwords are required to change these parameters. The following is a description of the System Configuration Parameters.

Full Load Setting

Number representing fuel system adjustment made at the factory to "fine tune" the fuel system. The correct value for this parameter is stamped on the engine information ratings plate. A new ECM must have this parameter programmed to avoid generating a Diagnostic Code 253-02 Check Customer Or System Parameters (56).

Full Torque Setting

Similar to Full Load Setting. This parameter must be programmed or a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will be generated.

Personality Module Code

Code which prevents use of incorrect personality module for this engine. Each power family and emission certification has a different code associated with it.

When a personality module is replaced (either using a personality module chip or if flash programmed), this code (stored in the ECM) must match the one in the introduced personality module or the engine will only run at low idle and a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will also be generated.

When rerating the engine, programming this code to "0" will prompt the ECM to read and match its stored code to the Personality Module Code. This code does not need to be programmed when a personality module is replaced, as long as the new module is of the same family and emission year.

If the Personality Module is of a different family, then pistons, injectors, etc. may need to be changed and the engine information plate must also be changed to reflect the new rating.

Some vehicle systems, such as the cooling system or transmission may also require changes when uprating an engine. Please contact the local OEM dealer for further information.

Engine Serial Number

Should be programmed to match the engine serial number stamped on the ratings plate. A new ECM is delivered with the engine serial number programmed to 0XX00000.

Customer Specified Parameters

Customer Specified Parameters allow the truck owner to influence how a driver operates the vehicle. Some parameters may affect engine operation in ways an inadequately trained driver does not expect. These parameters may lead to power or performance complaints, even when the engine is performing to specification.

Customer parameters may be changed repeatedly as a customer changes his operation or as new drivers are assigned to a truck. Customer Passwords are required to change these parameters.

The following is a brief description of the Customer Specified Parameters. Along with each are the minimum and maximum values for the parameter and the default value. Parameter value shown in bold is programmed setting to disable a feature.

The tables show values in U.S. (or English) units (miles, mph, quarts), followed by an approximate range for its metric (kilometers, km/h, liters) units counterpart. The exact range of the parameter in metric units depends upon the Service Tool used because each Tool may use slightly different conversion factors.

Customer Parameter Name Changes

Many of the parameter names have changed. The new names are listed first followed by the old name in parentheses. Some of the parameters have changed names to reflect industry descriptions, others have changed to reflect changes in the parameter itself.

Customer Parameter Lockout

This parameter is available to restrict access to changing some available parameters. Locking out a parameter requires Customer Passwords (if used). Once a parameter is locked out, Factory Passwords are required to change the parameter or unlock the parameter.

This parameter is available in JAN95 or later Personality Modules.

If a "lockable" parameter is not locked out, Factory Passwords are not required. A locked out parameter restricts the parameter from being changed directly by the customer. This helps vehicle owners encountering problems with operators obtaining Customer Passwords and altering some of these parameters.

It also provides a trail to determine who changed the parameter and when. The following Customer Parameters are available for Lockout.

* Vehicle Speed Limit

* VSL Protection

* Vehicle Speed Calibration

* High Cruise Control Speed Set Limit

* Top Engine Limit

* Soft Vehicle Speed Limit

* A/C Pressure Switch Fan-On Time

* Multi-Function Output #2 (NOV95 and later Personality Modules)

* Multi-Function Output #3 (NOV95 and later Personality Modules)

* Multi-Function Output #4 (AUG96 and later Personality Modules)

* Engine Retarder Delay (AUG96 and later Personality Modules)

* Top Gear Ratio (AUG96 and later Personality Modules)

* Top Gear Minus One Ratio (AUG96 and later Personality Modules)

* Top Gear Minus Two Ratio (AUG96 and later Personality Modules)

* Transmission Style (AUG96 and later Personality Modules)

When an attempt to change a locked out parameter occurs, the Factory Password screen will come up. Follow the instructions on the Service Tool screen if changing the parameter is required.

Factory Passwords are also required to change a parameter from "locked" to "unlocked". If more than one parameter is locked out, and each one needs to be unlocked, one Factory Password is required.

Engine Power Rating Selection Number

Number of rating within power family. The Personality Module defines the power family (such as 325 hp, [242 kW]) and may contain only one or several ratings. The rating number defines which rating is used (such as 435 hp [324 kW] Governed Speed 1800 rpm or 435 hp [324 kW] Governed Speed 2100 rpm) within the family.

Both ratings will be displayed for Multi-Torque applications with FEB98 and later Personality Modules.

Vehicle ID

Identification of the vehicle assigned by the customer and used only for customer reference. Not required by the ECM.

Security Access Parameters

ECM Trip Data Transfer

This parameter determines if the ECM will transfer trip information over the data link through remote communications systems for customers. This parameter is available in OCT96 or later Personality Modules.

The parameter will default out of Caterpillar to no access. It can only be enabled by getting Factory Passwords. This feature can only be enabled after the truck has been delivered to the customer. For more information refer to "ECM Trip Data Transfer" on page 16.

Vehicle Speed Parameters

Vehicle Speed Calibration

Used by the ECM to scale the vehicle speed signal into miles per hour (or kilometers per hour). Programmed in pulses per mile (or per kilometer). This parameter must be programmed or a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will occur. Minimum value for JAN97 and earlier Personality Modules is 14000 PPM (8696 P/km). Minimum value for FEB97 and later Personality Modules is 4000 PPM (2485 P/km).

This parameter affects cruise control, progressive shifting, the ECM speedometer signal, and can affect PTO operation. For more information refer to "PB-14: Vehicle Speed Circuit Test" on page 112.

Vehicle Speed Limit (VSL)

Top vehicle speed the ECM will permit. The ECM will shut off fuel above this speed. An inexperienced driver may think something is wrong with the engine, preventing the engine from fuelling above this programmed vehicle speed. In NOV95 and later Personality Modules this vehicle speed can be exceeded using cruise control if the Cruise Control High Speed Set Limit is programmed to a higher value

NOTE: The Driver Incentive feature can be used to automatically adjust the VSL according to the drivers operating habits. This feature is available on FEB98 and later Personality Modules.

VSL Protection

(formerly- Engine RPM at Vehicle Speed Limit)

Maximum engine rpm when there is an ECM detected vehicle speed signal problem. The ECM limits to this rpm when it sees no vehicle speed signal, and the engine is loaded. This is a feature to deter tampering by running without a Vehicle Speed input to the ECM.

NOTE: When this parameter is programmed to 2120 rpm, diagnostic code 84-01 Loss Of Vehicle Speed Signal (31) and 84-10 Vehicle Speed Rate of Change (36) (for JAN95 Personality Modules and later) is disabled, and the VSL Protection can be exceeded by disconnecting the Vehicle Speed Sensor.

Tachometer Calibration

Used by the ECM to scale the engine speed signal into revolutions per minute for a tachometer. Programmed in pulses per revolution. For APR94 or later Personality Modules the programmable range is from 12.0 to 500.0 in 0.1 ppr increments. For Personality Modules earlier than APR94 the programmable range is 12 to 113 ppr.

Soft Vehicle Speed Limit

Operates in conjunction with the Vehicle Speed Limit. It limits the vehicle speed from 2.5 mph below the programmed Vehicle Speed Limit at full load, to 2.5 mph above the selected Vehicle Speed Limit at no load.

For example, the full load vehicle speed would be used going up a hill (2.5 mph [4 km/h] less than the programmed vehicle speed limit), and the no load vehicle speed limit used going down the hill (2.5 mph [4 km/h] above the programmed vehicle speed limit). Refer to "Illustration 10 - "SoftCruise Control and Soft Vehicle Speed Limit" on page 30.

Cruise Control Parameters

Low Cruise Control Speed Set Limit

The lowest MPH at which cruise control can be used. Programming this parameter to the default, 127 mph (204 km/h), disables cruise control.

High Cruise Control Speed Set Limit

The highest MPH at which cruise control can be set. If a driver attempts to set a vehicle speed higher than this as the cruise set speed, the High Cruise Control Speed Set Limit will be the cruise set speed. For JUN95 and earlier Personality Modules, if this parameter is programmed higher than the Vehicle Speed Limit, the VSL is the maximum cruise set speed. For NOV95 and later Personality Modules, if this parameter is programmed higher than the Vehicle Speed Limit, the High Cruise Control Speed Set Limit is the maximum cruise set speed.

Engine Retarder

Determines operation of Auxiliary Retarder Relay and Engine Retarder Solenoids while the cruise control On/Off switch is in the ON position, but the engine is not in cruise control. This does not determine, or allow engine retarder operation while the engine is in cruise control. Refer to Auto Retarder in Cruise.

Allowable options are COAST, LATCH or MANUAL. When programmed to COAST, the retarder is enabled only while the service brakes are being applied with the Cruise On/Off switch in the ON position. When programmed to LATCH, the retarder stays enabled after the service brakes are released with the Cruise On/Off switch in the ON position. A prompt pressure on the brake pedal latches the retarder ON. If programmed to MANUAL, the retarder operates the same with the cruise switch ON (but not in cruise control) as when it is OFF. This parameter option is available in APR94 or later Personality Modules. The default setting is COAST.

Illustration 8 - Coast and Latch Engine Retarder Mode

Refer to "PB-20: Retarder Solenoid Circuits Test" on page 183 and "PB-19: Auxiliary Brake, Engine Running Output, Shutdown Output Circuits Test" on page 175 for more detail on operation of the engine retarder solenoids and auxiliary retarder relay.

Engine Retarder Minimum Vehicle Speed Limit Type

Provides two options, a Hard Limit and Soft Limit for the Engine Retarder Minimum Vehicle Speed option. This parameter option is available in AUG96 or later Personality Modules. If programmed to Hard Limit, below the programmed Engine Retarder Minimum Vehicle Speed the ECM disables the Retarder. The Soft Limit option allows the Engine Retarder to initiate activation above the programmed Engine Retarder Minimum Vehicle Speed Limit (just like Hard Limit), but allows Retarder operation to continue below the programmed minimum Engine Retarder Minimum Vehicle Speed Limit. The Soft Limit will not allow the Engine Retarder to initiate operation below the Engine Retarder Minimum Vehicle Speed Limit.

The following diagram illustrates Engine Retarder operation for both Engine Retarder Minimum Vehicle Speed Limit Type options. Engine Retarder parameter is programmed to MANUAL and Engine Retarder Minimum Vehicle Speed parameter is programmed to 30 MPH.

Illustration 9 - Limit Type Engine Retarder Operation

If the Engine Retarder Minimum Vehicle Speed is programmed to 0 mph, programming this parameter has no affect on Engine Retarder Operation.

Engine Retarder Minimum Vehicle Speed

Determines the minimum vehicle speed limit for the engine retarder(s) to come ON or remain ON. Below this vehicle speed the ECM will not turn ON the retarder unless the vehicle is stationary (vehicle speed = 0). If the vehicle is not moving, or if vehicle speed is 0 mph (because of a lost vehicle speed signal) the retarder can still operate. If programmed to zero the Retarder will operate at all vehicle speeds. This parameter affects both the Engine Retarder Solenoids and any Auxiliary Retarder such as a BrakeSaver.

Auto Retarder in Cruise (0=OFF)

Auto Retarder in Cruise (0=OFF) determines the miles per hour (km/h) value above the cruise set speed the engine retarder (only the retarder driven through the Engine Harness) will come ON provided the engine retarder switch is ON and the vehicle speed exceeds the cruise set speed. Programming the parameter to zero disables this feature. This parameter applies while the engine is in cruise control. Auto Retarder in Cruise is available in JAN95 or later Personality Modules.

Actual braking level is limited by the retarder switch settings. For example, the retarder will not come ON if the retarder is switched OFF.

For JUN95 and earlier Personality Modules the Medium and High braking levels will come on at 2 mph (3 km/h) increments above the programmed Auto Retarder in Cruise value. For NOV95 and later Personality Modules the Medium and High braking levels will come on at the programmed Auto Retarder in Cruise Increment (see below) above the programmed Auto Retarder in Cruise value.

If SoftCruise Control is programmed to YES, the retarder will not come on until the vehicle speed is 3 mph (5 km/h) above the cruise set speed. An Electronic Service Tool will change an attempt to program 1 or 2 mph (2 or 3 km/h) for this parameter to 3 mph (5 km/h) if SoftCruise is programmed to YES.

Auto Retarder in Cruise Increment

Requires the Auto Retarder in Cruise parameter programmed above 0 (0=OFF). Auto Retarder in Cruise Increment determines the miles per hour (km/h) increment when the Medium and High Engine Retarder levels will activate. Programming the parameter to zero will allow the retarder to come ON in the High mode when the programmed Auto Retarder in Cruise speed (above the cruise set speed) is reached.

This parameter applies while the engine is in cruise control. Actual braking level is limited by the retarder switch settings. For example, the retarder will not come ON if the retarder is switched OFF.

Cruise/Idle/PTO Switch Configuration

Defines function of Set/Resume for ACCEL and DECEL modes. This parameter applies to cruise control, idle, and PTO modes.

SoftCruise Control

SoftCruise Control provides a 5 mph (8 km/h) operating range around the cruise control set speed to provide a smoother cruise control.

Illustration 10 - "SoftCruise Control and Soft Vehicle Speed Limit

It controls the cruise speed from 2.5 mph (4 km/h) below the set vehicle speed at full load to 2.5 mph (4 km/h) above the set vehicle speed at no load. For example, the full load cruise control set speed would be used going up a hill (2.5 mph [4 km/h] less than the cruise control set speed), and the no load cruise control set speed used going down the hill (2.5 mph [4 km/h] above the cruise control set speed).

Idle Parameters

Idle Vehicle Speed Limit

Maximum vehicle speed for setting or maintaining a set engine rpm in either idle or PTO mode. Idle mode is entered if the engine rpm is set using the cruise control On/Off switch along with Set/Resume, whereas PTO mode is entered if the PTO On/Off switch is ON (uses Multi-Function Input #1). If the vehicle speed signal exceeds this value, the engine will stop attempting to maintain the set engine rpm.

For NOV95 and later Personality Modules the Idle/PTO Vehicle Speed Limit has been separated into two parameters, Idle Vehicle Speed Limit (with range as below) and PTO Vehicle Speed Limit (refer to "PTO Vehicle Speed Limit" on page 32).

Idle RPM Limit

Maximum engine rpm in idle mode. Idle mode occurs if the engine rpm is set using the cruise On/Off switch and the Set/Resume switch. The actual upper limit of this parameter is determined by the programmed Top Engine Limit. The lower limit is determined by the programmed Low Idle Engine RPM.

Programming this parameter to 600 rpm will prevent the engine from idling at a constant rpm above the programmed Low Idle rpm.

Idle/PTO RPM Ramp Rate

Engine rpm rate of increase/decrease. This parameter determines Accel, Decel, and Resume Idle or PTO Engine rpm rates of increase/decrease. The parameter can be set to a value between 5 rpm and 1000 rpm inclusively in one rpm increments. Notice that the parameter applies to both idle control (rpm set using cruise control On/Off switch and Set/Resume) and PTO control (rpm set using PTO On/Off switch and Set/Resume).

Idle/PTO Bump RPM

Determines the RPM increment/decrement when the Accel/Decel switches are briefly toggled. It applies to both dedicated PTO and idle. If a PTO Engine RPM Set Speed has been programmed the Idle/PTO Bump RPM applies only to engine rpm control initiated using the Cruise On/Off circuit not the PTO On/Off circuit. This parameter is available in JAN95 or later Personality Modules.

Dedicated PTO Parameters

The Dedicated PTO Parameters require JAN95 or later Personality Modules. If a JAN95 Personality Module is installed in an ECM on an engine previously having an earlier Module, the Dedicated PTO Parameters defaults will not affect, nor require any wiring changes to the vehicle. If some of the new Dedicated PTO Parameters are programmed from their defaults, some wiring changes may be required.

A PTO Installation and Applications Special Instruction, SEHS9856, is available to further explain these features and how to install them.

PTO Configuration

Determines the use of the ECM Multi-Function inputs, if any, for PTO applications. OFF (default) indicates the application does not use PTO. The remaining PTO programmable options require a PTO On/Off circuit connected to ECM Vehicle Harness Connector J1/P1, pin-8. If programmed to Cab Switches the ECM will use the Cab Set (P1, pin-25) and Resume (P1, pin-15) switch inputs for PTO control as well as Cruise Control. If programmed to Remote Switches the ECM will monitor ECM Vehicle Harness Connector J1/P1, pin-32 for PTO Set and, pin-31 for PTO Resume, ignoring the Cab switches when the PTO On/Off circuit is ON.

If programmed to Remote Throttle the ECM will monitor ECM Vehicle Harness Connector J1/P1, pin-31 for a second PWM throttle position sensor input. This parameter is available in JAN95 or later Personality Modules.

PTO Top Engine Limit

The top engine limit available using a PTO On/Off circuit connected to pin-8 of ECM Connector J1/P1.

This parameter is programmable to 2120 maximum, and is NOT limited by the programmed Top Engine Limit (TEL) parameter.

For example, the Top Engine Limit could be set at 1800 rpm to match the driveline and provide optimum fuel economy over the road, and the PTO TEL set to 2120 rpm to provide necessary engine RPM for a PTO driven pump. PTO Configuration must be programmed to Cab Switches, Remote Switches, or Remote Throttle before this parameter can be programmed. This parameter is available in JAN95 or later Personality Modules.

PTO Engine RPM Set Speed

The engine speed the ECM will proceed to when the PTO On/Off circuit is ON and then the cruise control Set switch is toggled.

If the PTO to Set Speed parameter is programmed to YES, the engine will proceed to this speed whenever the PTO On/Off circuit is ON. PTO Configuration must be programmed to Cab Switches or Remote Switches for this parameter to take effect. This parameter is available in JAN95 or later Personality Modules.

This parameter must be programmed higher than the programmed Low Idle. If programmed to a higher value than the PTO Top Engine Limit, the Set Speed will be limited by the lower PTO Top Engine Limit.

For operation requiring a single rpm above low idle, (low idle and PTO Engine RPM Set Speed) the PTO Top Engine Limit should be programmed to the same RPM as the PTO Engine RPM Set Speed.

For two rpm set speeds above low idle, program this parameter to some intermediate value between the low idle and the PTO Top Engine Limit.

Place the PTO On/Off circuit switch to the ON position. Toggle the Set switch once to cause RPM to advance to the PTO Engine RPM Set Speed.

Toggle the Set switch again, and the engine advances to the PTO Top Engine Limit. Toggling the Resume switch decreases the engine speed to the previous set speed.

PTO to Set Speed

Causes the ECM to proceed to the programmed PTO Engine RPM Set Speed when the PTO On/Off circuit is ON. PTO Configuration must be programmed to Cab Switches or Remote Switches before this parameter can be programmed. This parameter is available in JAN95 or later Personality Modules.

PTO Cab Throttle RPM Limit

Determines the engine RPM limit of the Cab Throttle Position Sensor when PTO Control is programmed to Cab Switches and the PTO On/Off circuit is ON.

* If programmed to Low Idle, the Cab Throttle Position Sensor is ignored.

* If programmed to TEL, the engine will operate to the programmed Top Engine Limit.

* If programmed to PTO TEL, the engine will operate to the programmed PTO Top Engine Limit.

This parameter is intended to prevent engine overspeed while using dedicated PTO. PTO Configuration must be programmed to Cab Switches for this parameter to take effect. If PTO Configuration is programmed to Remote Switches or Remote Throttle, the ECM will always ignore the Cab Throttle Position Sensor when the PTO On/Off circuit is ON. This parameter is available in JAN95 or later Personality Modules.

PTO Vehicle Speed Limit

For NOV95 and later Personality Modules this parameter determines the maximum vehicle speed for setting or maintaining a set engine rpm in PTO mode. PTO mode is entered if the PTO On/Off switch is ON (uses Multi-Function Input #1). If the vehicle speed signal exceeds this value, the engine will no longer maintain the set engine rpm. For JUN95 and earlier Personality Modules the Idle/PTO Vehicle Speed Limit determines the maximum PTO Vehicle Speed (refer to "Idle Vehicle Speed Limit" on page 30).

NOTE: If updating an ECM from JAN95 or JUN95 Personality Modules to a NOV95 Personality Module, this parameter should be programmed to match the Idle/PTO Vehicle Speed Limit if Dedicated PTO Parameters are used and the Idle/PTO Vehicle Speed Limit is programmed above 1 mph (2 km/h).

Torque Limit

Torque limit of the engine applies when the PTO On/Off circuit is ON (Multi-Function Input #1), and the vehicle speed is less than the programmed Idle/PTO vehicle speed limit. The Torque Limit also applies if ECM Connector P1, pin-32 is connected to Sensor Common with the PTO On/Off circuit OFF regardless of the vehicle speed. This parameter is available in JAN95 or later Personality Modules.

Illustration 11 - Torque Limit Operation

The maximum value is the Rated Torque of the engine. Programmable in foot pounds (or N·m) of torque, programming a value higher than the Rated Torque is limited by the ECM to Rated Torque. The torque limit is indicated by the dashed line in the figure below. PTO Configuration must be programmed to Cab Switches, Remote Switches, or Remote Throttle for the Torque Limit to function.

PTO Shutdown Time

Time (in minutes) the engine will operate with the PTO On/Off circuit ON and no vehicle speed before shutting down. The ECM will only count this timer with no vehicle speed and the PTO On/Off circuit ON. The PTO Shutdown Timer will not begin counting if the engine is in Cold Mode. This parameter requires PTO Configuration programmed to Cab Switches, Remote Switches, or Remote Throttle for the timer to function. When the elapsed time equals the programmed value the engine will shut down regardless of load. Requires NOV95 or later Personality Modules.

NOTE: This feature does not shut down vehicle power, the ECM and vehicle remain powered.

PTO Activates Cooling Fan

Requires use of the ECM cooling fan circuit. The ECM will signal the cooling fan to continuous operation when the PTO On/Off circuit is ON to reduce changes in load while being used for dedicated PTO applications. Setting this parameter to Normal (default) indicates the fan will operate the same (dependent upon coolant temperature, etc.) with the PTO On/Off circuit ON or OFF. PTO Configuration must be programmed to Cab Switches, Remote Switches, or Remote Throttle before this parameter can be programmed. This parameter is available in JAN95 or later Personality Modules.

Engine/Gear Parameters

Lower Gears Engine RPM Limit

Engine rpm limited below "Lower Gears Engine RPM Limit". The engine will accelerate at a slower rate when this limit is exceeded under normal driving conditions. This is to encourage the driver to shift to the next highest gear.

Lower Gears Turn Off Speed (mph)

Vehicle Speed where "Lower Gears Engine RPM Limit" is shut off. This must be matched with "Low Gear #1 RPM Limit" to the specific drive train for best performance.

Intermediate Gears Engine RPM Limit

Similar to "Lower Gears Engine RPM Limit". The engine will accelerate at a slower rate when this limit is exceeded under normal driving conditions. Typically programmed to slightly higher rpm than Low Gears #1 RPM Limit.

Intermediate Gears Turn Off Speed (mph)

Similar to "Lower Gears Turn Off Speed". Typically programmed to a slightly higher vehicle speed than Low Gears #1 Turn Off Speed.

Gear Down Protection RPM Limit

Engine RPM Limit when vehicle speed is above "Gear Down Protection Turn On Speed". This is a "hard" limit, the ECM will not fuel the engine above this limit. This is to encourage the driver to shift up into overdrive or top gear.

Gear Down Protection Turn On Speed (mph)

Vehicle Speed where "Gear Down Protection RPM Limit" is ON. This must be matched to the specific drive train for best performance. Above this vehicle speed limit the engine rpm will be limited by the Gear Down Protection RPM Limit.

Top Engine Limit (TEL)

Maximum engine rpm when the engine is under load. The engine will still achieve Rated RPM under no load conditions.

Top Engine Limit With Droop

With the Top Engine Limit with Droop selected, the engine can exceed the TEL with a partial load. The "RPM Limit" increases as load decreases to 150 RPM above the selected limit for no load. Note the TEL+150 RPM is limited to 2120 RPM maximum

Low Idle Engine RPM

Minimum engine rpm.

Transmission Style

This parameter can be programmed to match the type of transmission in the vehicle, or to match the circuit connected to the Clutch Switch input. If a manual transmission is installed, this parameter should be programmed to Manual with a clutch switch installed at ECM Connector J1/P1, pin-24 (Clutch Sw). If an automatic is installed, this parameter can be programmed to Auto w/o 2 Brake Sw with the clutch switch open (the ECM will ignore the Clutch Switch Input). If this parameter is programmed to Auto w/2 Brake Sw, the clutch switch is replaced with a second service brake switch. This parameter can be programmed to Manual for an automatic transmission if the clutch switch input is jumpered from ECM Connector J1/P1, pin-24 (Clutch Sw) to pin-29 (Sensor Common). This parameter and associated circuits must be installed as outlined above to insure engine retarder equipped vehicles operate the retarder correctly. This parameter is available in JAN95 or later Personality Modules.

The Eaton Top 2 transmission is a manual transmission and requires a clutch switch. The ECM operates two solenoids to control shifting between the top two gears of an Eaton Top 2 transmission. A total of six parameters must be programmed for the system to operate correctly.

Eaton Top 2 option requires AUG96 or later Personality Modules.

The following table indicates what should be connected to the ECM Clutch Switch input (J1/P1, pin-24) for each of the parameter options.

Eaton Top 2 Override With Cruise Switch (MAR 98 and later Personality Modules)

If this parameter is programmed to YES the Cruise Control On/Off switch can be used to disable Top 2 mode. Turning the Cruise Control On/Off switch to the OFF position when the transmission is not in Top 2 mode will disable Top 2 mode (manual operation only). Turning the Cruise Control On/Off switch to the ON position will enable the Top 2 mode and allow for automatic shifting in the Top 2 gears. When operating in one of the Top 2 gears and Top 2 mode is enabled, switching the Cruise Control On/Off switch to the OFF position will place the transmission in Hold mode (will not shift out of currently selected gear). Returning the switch to the ON position will return to Top 2 mode. Depressing the Clutch while in Hold mode will result in Manual mode (Top 2 disabled).

Top Gear Ratio

Identifies the highest gear ratio for an Eaton Top 2 Transmission. For example, 10th gear for an Eaton Super 10 Top 2 transmission is the Top Gear. Programmable range is 0.000 to 3.750 in 0.001 increments. Default is 0.000. Refer to "Eaton Top 2 Transmission Gear Ratios Table" on page 35 for programmable values for each Eaton Top 2 transmission.

NOTE: This parameter must be precisely programmed to three decimal places to ensure proper operation of the Eaton Top 2 and Caterpillar engine drivetrain in the top two gears.

Top Gear Minus One Ratio

Identifies the next to highest gear ratio for an Eaton Top 2 Transmission. For example, 9th gear for an Eaton Super 10 Top 2 transmission is Top Gear Minus One. Programmable range is 0.000 to 3.750 in 0.001 increments. Default is 0.000. Refer to "Eaton Top 2 Transmission Gear Ratios Table" on page 35 for programmable values for each Eaton Top 2 transmission.

NOTE: This parameter must be precisely programmed to three decimal places to ensure proper operation of the Eaton Top 2 and Caterpillar engine drivetrain in the top two gears.

Top Gear Minus Two Ratio

Identifies the second to highest gear ratio for an Eaton Top 2 Transmission. For example, 8th gear for an Eaton Super 10 Top 2 transmission is Top Gear Minus Two. Programmable range is 0.000 to 3.750 in 0.001 increments. Default is 0.000. Refer to "Eaton Top 2 Transmission Gear Ratios Table" on page 35 for programmable values for each Eaton Top 2 transmission.

NOTE: This parameter must be precisely programmed to three decimal places to ensure proper operation of the Eaton Top 2 and Caterpillar engine drivetrain in the top two gears.

Eaton Top 2 Transmission Gear Ratios Table

NOTE: XX appearing in Transmission Model number refers to (x) 100 = Nominal Torque Capacity. For example, RTLO-14613A has a Nominal Torque Capacity of 14 (x) 100 or 1400 lb ft.

Transmission model designation and other transmission identification information are stamped on the transmission tag. The tag is located on the lower left side near the front of the transmission.

Timer Parameters

Idle Shutdown Time

Time (in minutes) the engine will idle before shutting down. The ECM will only shutdown with low engine load and no vehicle speed. The Idle Shutdown Timer will not begin counting if the engine is in Cold Mode. If this parameter is programmed to zero, this feature is disabled and the engine will idle until the key switch is in the OFF position. Maximum for JUN95 and earlier Personality Modules is 60 minutes, the maximum for NOV95 and later Personality Modules is 1440 minutes (24 hours).

NOTE: This feature does not shut down vehicle power, the ECM and vehicle remain powered.

Allow Idle Shutdown Override

Determines if the clutch or service brake can be used to override the idle shutdown timer during the driver alert (in the last 90 seconds when the Check Engine Lamp begins flashing). Requires Idle Shutdown Time (0=OFF) to be programmed to 3 or more minutes to take affect This parameter is available in APR94 or later Personality Modules. NOV95 and later Personality Modules also provide the Outside Temperature Based option for Allow Idle Shutdown Override. AUG96 and later Personality Modules provide another additional option, J1587 Outside Temperature Based for Allow Idle Shutdown Override.

If programmed to Outside Temperature Based or J1587 Outside Temperature Based, depressing the clutch or service brake in the last 90 seconds when the Check Engine Lamp begins flashing will override the timer (the engine will not shutdown) if the outside temperature is below the programmed Minimum Idle Shutdown Outside Temperature or above the Maximum Idle Shutdown Outside Temperature.

If the outside temperature is in between the Minimum Idle Shutdown Outside Temperature and the Maximum Idle Shutdown Outside Temperature the timer is not overridden and the engine will shutdown. If the Outside Temperature Based option is programmed, a Caterpillar Air Temperature Sensor part number 106-0735 must be installed to measure the outside temperature. If the sensor is not installed a 171-03 Outside Air Temperature Sensor Open Circuit diagnostic code will be active. If the J1587 Outside Temperature Based option is programmed and an active 171-11 No Ambient Air Temperature Data diagnostic code exists, the idle shutdown timer will be disabled.

Minimum Idle Shutdown Outside Temperature

Determines the lower outside temperature limit if the Allow Idle Shutdown Override parameter is programmed to Outside Temperature Based or J1587 Outside Temperature Based.

Illustration 12 - Allow Idle Shutdown Override Programmed to Outside Temperature Based or J1587 Outside Temperature Based

Maximum Idle Shutdown Outside Temperature

Determines the upper outside temperature limit if the Allow Idle Shutdown Override parameter is programmed to Outside Temperature Based or J1587 Outside Temperature Based. "Illustration 12 - Allow Idle Shutdown Override Programmed to Outside Temperature Based or J1587 Outside Temperature Based" on page 36 indicates the Idle Shutdown Override is allowed only during the final 90 seconds of timer counting with the outside temperature below the Minimum Idle Shutdown Outside Temperature or above the Maximum Idle Shutdown Outside Temperature.

A/C Pressure Switch Fan-On Time

An input to the ECM is available for connection of a normally closed high pressure A/C switch. The ECM has a timer built in to prevent excessive cycling of the cooling fan clutch due to successive cycling of the A/C switch input. Programming this parameter to zero disables this feature, the ECM will not monitor this input. Minimum for NOV95 and earlier Personality Modules is 30 seconds, the minimum for AUG96 and later Personality Modules is 1 second.

Fan with Engine Retarder in High Mode

Fan with Engine Retarder in High Mode determines if the Cooling Fan will come ON when the Engine Retarder has been active in High mode for at least two seconds. This parameter is available in APR94 or later Personality Modules.

Retarder Delay Time

Engine Retarder Delay parameter provides a programmable delay after conditions to turn the retarder or brake ON are met. This parameter is available in AUG96 or later Personality Modules.

Engine Monitoring Parameters

Engine Monitoring Mode

Determines the level of action taken by the ECM in response to a potentially engine damaging condition recognized by the Caterpillar Coolant Temperature, Oil Pressure, Intake Manifold Air Temperature, or OEM Coolant Level (if installed and enabled) Sensors.

NOTE: 3406E Personality Modules for use with a Caterpillar BrakeSaver do not have the Shutdown mode available.

Coolant Level Sensor (Enable/Disable)

Determines if the ECM monitors the Coolant Level Sensor inputs.

Maintenance Indicator Parameters

Maintenance Indicator Mode

The ECM records data related to vehicle maintenance. If Distance is selected (Manual - Distance or Automatic - Distance), then all maintenance indications (PM1, PM2, Coolant Flush/Fill) on the service tool will be displayed in Distance.

If Hours is selected (Manual - Hours or Automatic - Hours), then all maintenance indications (PM1, PM2, Coolant Flush/Fill) on the service tool will be in hours. The ECM provides PM1 maintenance interval and last maintenance information.

PM1 Interval

(for Manual Maintenance Indicator Mode)

PM1 Interval allows a user-specified PM1 maintenance interval. This parameter (PM1 Interval) must be programmed only if Maintenance Indicator Mode is programmed to Manual - Distance or Manual - Hours.

For Manual - Distance Miles (Kilometers)

For Manual - Hours

Engine Oil Capacity (quarts)

(of Automatic Maintenance Indicator Mode)

PM1 Interval can be determined from the ECM based on fuel usage. This parameter must be programmed only if Maintenance Indicator Mode is programmed to Automatic - Distance or Automatic - Hours. Sump Capacity influences the Maintenance Interval.

Trip Parameters

Fuel Correction Factor

The fuel correction factor is available to fine tune all fuel data stored in the future by the ECM. Caterpillar recommends this factor be changed only after a significant operating interval with a comparison of actual tank fuel economy compared to ECM recorded fuel economy. The operating interval should also reflect a typical route. The Factor is a percentage, programmable in 0.5 percent increments.

* Calculating Fuel Correction Factor

The following formula should be used to determine the new Fuel Correction Factor (NEW FCF).

Where OLD FCF is the Fuel Correction Factor currently in ECM, TANK is the actual fuel economy, and ECM is the fuel economy indicated in the ECM Trip Data.

Example

The Actual TANK fuel economy is determined to be 7.1 mpg, but the ECM Trip Data economy is 7.0 mpg over the same distance with an OLD FCF of -2.5.

Dash Display Access Parameters

The parameters Change Fuel Correction Factor, PM1 Reset, and Fleet Trip Reset establish security access for the Caterpillar Driver Information Display. These parameters require a Caterpillar Driver Information Display for access.

State Selection

Program to NO to disable this function of the Cat ID. The Cat ID will not show state selection as an option to the driver. If programmed to Yes (default) the Cat ID will provide the State Selection feature.

Programming this parameter to NO eliminates state crossing selection and therefore storage of State tagged trip data. This parameter requires AUG96 or later Personality Modules.

Change Fuel Correction Factor

Allows the driver to adjust the Fuel Correction Factor. An owner-operator would want driver access to this information, but a fleet operation might not. This parameter is available in APR94 or later Personality Modules.

PM1 Reset

Determines access for the driver to reset the PM1 Maintenance, when performed. Maintenance Indicator Mode cannot be programmed to OFF for the PM1 Reset parameter to take effect.

Fleet Trip Reset

Fleet Trip Reset sets access for the driver to reset the Fleet Trip Information. This parameter is available in APR94 or later Personality Modules.

Theft Deterrent System Control

When used with a Theft Deterrent Password prevents the engine from starting unless the password has been entered via the CAT ID dash display. The operator must first enter the password before the engine shuts off in order to enable the system, preventing engine starting without reentering the password on the next attempted start. This parameter is available in JAN95 or later Personality Modules.

Theft Deterrent Password

The password required by the ECM before the Theft Deterrent feature is enabled or prevents engine starting. This parameter is available in JAN95 or later Personality Modules.

Quick Stop Rate

Determines the rate of vehicle speed change the ECM uses to record a Quick Stop Event Code and Quick Stop Snapshot. Programmable from 0-15 mph/s (0-24 km/h/s, 0 = default = OFF). Each Quick Stop Snapshot contains 60 frames of information; frame 45 is the Quick Stop occurrence, 44 frames before, 15 frames following the code. Each frame is separated by 1.0 second. This parameter is available in NOV95 or later Personality Modules.

ECM Snapshot Frame Data

The most recent Quick Stop Snapshot is stored in the ECM memory. Each time another Quick Stop occurs the ECM replaces the old Snapshot with the new one. The ECM also logs a diagnostic event code (maximum of 255 occurrences stored) for each Quick Stop Occurrence.

NOTE: Programming the Quick Stop Rate too low will cause an excessive number of Quick Stop Event Codes. The vehicle will be able to stop much more quickly without a load or trailer than with a heavy load. If too many Quick Stop Event Codes are being logged, the Quick Stop Rate should be increased to better detect the exceptions when they occur.

ECM Date/Time Clock

For ECM's with serial numbers ending in "CG" or "CJ" a date and time clock is available in the ECM. This parameter is available in NOV95 or later Personality Modules in these ECM's only.

The ECM clock date, hours, minutes, and seconds can be programmed from an Electronic Service Tool.

Output Selections

These parameters are available in NOV95 or later Personality Modules.

Multi-Function Output #2

Determines the function of ECM Vehicle Harness Connector J1/P1 pin 40. The default is Auxiliary Brake for use with a BrakeSaver or other aftermarket braking devices. Options include Engine Running Output, Shutdown Output, and None. Refer to "PB- 19: Auxiliary Brake, Engine Running Output, Shutdown Output Circuits Test" on page 175, for a description of how these options work. This parameter is available in NOV95 or later Personality Modules.

Multi-Function Output #3

Determines the function of ECM Vehicle Harness Connector J1/P1 pin 34. The default is NONE. Options include Auxiliary Brake for use with a Brakesaver or other aftermarket braking devices, Engine Running Output, Shutdown Output, and Cooling Fan #2 Output on FEB98 and later Personality Modules. Refer to "PB- 19: Auxiliary Brake, Engine Running Output, Shutdown Output Circuits Test" on page 175, or "PB-18: Cooling Fan and A/C High Pressure Switch Circuits Test" on page 157, for descriptions of how these options work. This parameter is available in NOV95 or later Personality Modules.

Multi-Function Output #4

Determines the function of ECM Vehicle Harness Connector J1/P1 pin 28. The default is Cooling Fan. Options include Auxiliary Brake for use with a Brakesaver or other aftermarket braking devices, Engine Running Output, and Shutdown Output. Refer to "PB- 19: Auxiliary Brake, Engine Running Output, Shutdown Output Circuits Test" on page 175, for a description of how these options work. This parameter is available in AUG96 or later Personality Modules.

Fan Control Type

Determines if the ECM is used to operate the cooling fan relay (or solenoid). Options are On-Off (default), Three Speed Fan, or NONE. This parameter should be programmed to NONE if the ECM is not connected to or operating the cooling fan relay (or solenoid). If AUG96 or later Personality Module this parameter is dependent on Multi-Function Output #4 programmed to Cooling Fan.

The Three Speed Fan feature is available on FEB98 or later Personality Modules. This parameter is dependent on Multi-Function Output #3 and Multi-Function Output #4 programming. For a Horton Three Speed Fan or an On-Off type Fan, Multi-Function Output #4 must be programmed to Cooling Fan Output. For a Three Speed Fan, Multi-Function Output #3 must be programmed to Cooling Fan #2 Output. When programmed to NONE the service technician can use an Electronic Service Tool to determine the ECM is not connected to the fan circuit. The Fan Control Type parameter is available in NOV95 or later Personality Modules.

Data Link Parameters

The data link parameter Powertrain Data Link determines if the ECM will communicate to a powertrain device using either the SAE J1922, SAE J1939, or both SAE J1922 and SAE J1939 data links. If the vehicle is not using the data link for communication to the powertrain (traction control systems, anti-lock brake systems, electronically controlled transmissions) this parameter should be turned OFF.

Only an ECM equipped with the SAE J1939 Data Link will allow programming this parameter to either of the J1939 options.

NOTE: A diagnostic code 231-11 J1939 Data Link Fault (58) will occur if the Powertrain Data Link parameter is set to either SAE J1939 or SAE J1922 & SAE J1939 without a SAE J1939 powertrain component on the vehicle.

Injector Codes

Injector Codes are etched on each injector for 3406E injectors built APR94 or later. Injector Codes can be viewed/changed from an Electronic Service Tool under the Calibrate/Monitor Sensors screen. The injector code should match the code on its corresponding injector.

Injector Codes and Personality Modules with a Release Date After APR94

If an injector is replaced on an engine with serial number 5EK19731 and up or with serial number 6TS1 and up, program the Injector Code from the new Injector (etched on the Injector). The injector code should match the code on its corresponding injector.