3126B TRUCK ENGINE FOR FMTV MILITARY AP Caterpillar

Many programmable parameters affect 3126B HEUI Engine operation. These parameters may be changed using Electronic Service Tools. The parameters are stored in the ECM, not the Personality Module. Most parameters can be read. However, passwords protect parameters from unauthorized changes.

There are two categories containing 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. Refer to 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). For details on how to read and change parameters using a CAT ET, refer to the Caterpillar Electronic Technician, Getting Started Manual, included with the software.

System Configuration Parameters

System Configuration Parameters affect emissions or rated 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 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 (FLS)

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 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 (FTS)

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

This code prevents using an incorrect personality module for the engine. Each power rating family and emission certification has a different code associated with it.

When a personality module is replaced (using flash programming), this code (stored in the ECM) must match the one in the introduced personality module or the engine will only operate at low idle and a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will 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

This number should be programmed to match the engine serial number stamped on the Engine Information Plate.

Personality Module Release Date

This parameter is defined by the Personality Module and is not programmable. It is used to provide the version of the software. Customer parameters and software changes can be tracked by this date. The date is provided in month and year (MAY99), where MAY is the month (MAY) and 99 is the year (1999).

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 may be 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.

NOTE: Parameter value shown in bold is programmed setting to disable a feature.

The tables show values in metric (kilometers, km/h, liters) units followed by U.S. (or English) units (miles, mph, quarts). An approximate range is shown for metric units. 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 Lockout

This feature restricts access to changing some available parameters. Once a parameter is locked out, Factory Passwords are required to change the parameter or unlock the parameter.

If a "lockable" parameter is not locked out, Factory Passwords are not required to change or lock the parameter. 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

* Soft Vehicle Speed Limit

* A/C Switch Fan On-Time

* High Speed Range Axle Ratio

* Low Speed Range Axle Ratio

* Top Engine Limit (TEL)

* Transmission Style

* Input #6

When an attempt to change a locked out parameter occurs, the Service Tool will indicate the parameter is LOCKED. Go to the Parameter Lockout screen to UNLOCK the parameter.

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.

Rating Number

Rating number within a power family. The Personality Module defines the power family such as 224 kW (300 hp) and may contain only one or several ratings. The rating number defines which rating is used within the family.

Vehicle ID

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

Vehicle Speed Parameters

Vehicle Speed Calibration

The ECM uses this value to scale the vehicle speed signal into miles per hour. It is programmed in pulses per mile (PPM). This parameter must be programmed or a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will occur. 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 111.

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, because the engine will not fuel above this vehicle speed limit.

VSL Protection

Maximum engine rpm when there is an ECM detected vehicle speed signal problem. The ECM limits to this engine rpm when it senses 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 the TEL rpm, Diagnostic Codes 84-01 Loss Of Vehicle Speed Signal (31) and 84-10 Vehicle Speed Rate of Change (36) are disabled, and the VSL Protection can be exceeded by disconnecting the Vehicle Speed Sensor.

Tachometer Calibration

The ECM uses this value to scale the engine speed signal into revolutions per minute for a tachometer. It is programmed in pulses per revolution (ppr). Programmable range is from 12.0 to 500.0 in 0.1 ppr increments.

Soft Vehicle Speed Limit

This limit operates in conjunction with the Vehicle Speed Limit. It limits the vehicle speed from 4 km/h (2.5 mph) below the programmed Vehicle Speed Limit at full load, to 4 km/h (2.5 mph) above the selected Vehicle Speed Limit at no load.

Low Speed Range Axle Ratio

This parameter must be programmed when a 2-Speed Axle On/Off Switch is used by the ECM in order to adjust the vehicle speed calibration. When a two-speed axle is used, the change in gear ratios from the main drive axle ratio to the two-speed axle ratio alters the calibration of the vehicle speed limit, which requires a calibration adjustment to ensure the ECM driven speedometer and the ECM stored information correctly reflect the actual vehicle speed. This parameter should be programmed to the alternate drive axle ratio. If a two-speed axle is not used, the parameter does not require programming.

High Speed Range Axle Ratio

This parameter must be programmed when a 2-Speed Axle On/Off Switch is used by the ECM in order to adjust the vehicle speed calibration. When a two-speed axle is used, the change in gear ratios from the main drive axle ratio to the two-speed axle ratio alters the calibration of the vehicle speed limit, which requires a calibration adjustment to ensure the ECM driven speedometer and the ECM stored information correctly reflect the actual vehicle speed. This parameter should be programmed to the main drive axle ratio. If a two-speed axle is not used, the parameter does not require programming

Cruise Control Parameters

Low Cruise Control Speed Set Limit

The lowest vehicle speed at which cruise control can be used. Programming this parameter to the maximum value disables cruise control.

High Cruise Control Speed Set Limit

The highest vehicle speed 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.

Engine Brake Mode

Determines operation of the Engine Brake 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 brake operation while the engine is in cruise control.

Allowable options are COAST, LATCH or MANUAL. When programmed to COAST, the engine brake is enabled only while the service brakes are being applied. When programmed to LATCH, the engine brake stays enabled after the service brakes are released. A direct, immediate pressure on the brake pedal latches the engine brake ON.

If programmed to MANUAL, the engine brake operates the same with the cruise control switch ON (but not in Cruise) as when it is OFF.

Figure 3 - Coast and Latch Engine Brake Mode

Refer to PB-18: Exhaust Brake Relay And AT/MT/HT Transmission Relay Circuits Test on page 151 for details on operation of the engine brake.

Cruise/Idle/PTO Switch Configuration

The configuration defines the 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 8 km/h (5 mph) operating range around the cruise control set speed to provide a smoother cruise control.

It controls the cruise speed from 4 km/h (2.5 mph) below the set vehicle speed at full load to 4 km/h (2.5 mph) above the set vehicle speed at no load.

Figure 4 - SoftCruise Control and Soft Vehicle Speed Limit

Idle Parameters

Idle Vehicle Speed Limit

If the vehicle speed signal exceeds this value, the engine will not maintain the set engine rpm. Idle mode is entered if the engine rpm is set using the cruise control On/Off switch along with Set/Resume.

Idle RPM Limit

Maximum set engine rpm in idle mode. Idle mode occurs if the engine rpm is set using the cruise control On/Off switch and the Set/Resume switch. The actual 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 and 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.

NOTE: 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).

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 Control On/Off circuit not the PTO On/Off circuit.

Fast Idle RPM #1

Fast Idle RPM #1 determines the preset Fast Idle engine rpm as controlled using the Fast Idle Enable Switch. This rpm can be overridden within its programmable range by the operator. To override, depress the accelerator pedal until the desired rpm is reached, and then depress the Fast Idle Enable Switch. This rpm will be the Fast Idle RPM as long as the ECM is powered up.

Fast Idle RPM #2

Fast Idle RPM #2 determines the second preset Fast Idle engine rpm as controlled using the Fast Idle Enable Switch. This rpm preset is disabled by programming it to 0.

The Fast Idle RPM Customer Parameter range is 700 - TEL rpm. The Fast Idle RPM #2 Customer Parameter range is 700 - TEL rpm with 0 rpm as the default. Following engine start up, depressing/toggling the Fast Idle Enable switch ramps the engine to the programmed Fast Idle RPM. If Fast Idle RPM #2 is programmed to 0 depressing/toggling the Fast Idle Enable switch will cause the engine to return to Low Idle. Depressing/toggling the Fast Idle Enable switch with Fast Idle RPM #2 programmed to a value greater than 0 will cause the engine to ramp to the programmed Fast Idle RPM #2. Depressing/toggling the Fast Idle Enable switch a third time will cause the engine to return to low idle. The engine ramps to the Fast Idle RPM, Fast Idle RPM #2, and Low Idle at a rate independent of the programmed Idle/PTO Ramp Rate.

Dedicated PTO Parameters

PTO Installation and Application Manual is available to further explain these features and how to install them.

PTO Configuration

Determines the features available and inputs used for Dedicated 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 INPUT #1 (ECM Connector J1/P1, terminal-56). OUTPUT #1 (ECM Connector J1/P1, terminal- 30) can also be used as a PTO Switch On Lamp, or a lamp can be installed in parallel with the PTO On/Off Switch.

If programmed to Cab Switches the ECM will use the Cab SET (J1/P1, terminal- 35) and RESUME (J1/P1, terminal- 44) switch inputs for PTO control and Cruise Control.

If programmed to Remote Switches the ECM will monitor programmed inputs and ignore the cab controls when the PTO On/Off circuit is ON.

If programmed to Remote Throttle, the ECM will monitor INPUT #8 (J1/P1, terminal- 68) for the second, remote accelerator pedal position sensor. The ECM will monitor programmed inputs and ignore the cab controls when the PTO On/Off circuit is ON.

PTO Top Engine Limit

The top engine limit available using a PTO On/Off circuit connected to INPUT #1 (terminal-56 of ECM Connector J1/P1). This parameter is programmable to TEL rpm maximum, but is limited by the programmed Top Engine Limit (TEL) parameter.

NOTE: PTO Configuration must be programmed to Cab Switches, Remote Switches, or Remote Throttle before this parameter can be programmed.

PTO Engine RPM Set Speed

The engine rpm the ECM will allow the engine to proceed to when the PTO On/Off circuit is ON and then the 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 turned ON.

NOTE: PTO Configuration must be programmed to Cab Switches or Remote Switches for this parameter to function.

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 one rpm set speed operation 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 rpm to the previous set speed.

PTO to Set Speed

This parameter 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.

NOTE: The PTO to set speed parameter is not available for PTO Configuration Remote Throttle.

PTO Cab Throttle RPM Limit

Determines the engine rpm limit of the Cab Accelerator Pedal Position Sensor when PTO Configuration is programmed to Cab Switches and the PTO On/Off circuit is ON.

* If programmed to Low Idle, the Cab Accelerator Pedal 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.

NOTE: 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.

PTO Vehicle Speed Limit

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 INPUT #1). If the vehicle speed signal exceeds this value, the engine will no longer maintain the set engine rpm.

Torque Limit

Torque limit of the engine applies when the Torque Limit Switch is ON. This feature should only be used for temporary protection of equipment.

Figure 5 - Torque Limit Operation

The maximum value is the Rated Torque of the engine. Programmable to N·m (lb ft) 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 Figure 5. 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. Engine 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.

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. Fan Control Type must also be programmed to On-Off.

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

Vehicle Speed where "Lower Gears Engine RPM Limit" is shut off. This must be matched with "Lower Gears Engine 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 Lower Gears Engine RPM Limit.

Intermediate Gears Turn Off Speed

Similar to "Lower Gears Turn Off Speed". Typically programmed to a slightly higher vehicle speed than Lower Gears 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 allow fuel to the engine above this limit. This is to encourage the driver to shift into overdrive or top gear.

Gear Down Protection Turn On Speed

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.

Low Idle Engine RPM

Minimum engine rpm.

Idle Quality Calibration

This parameter should not be adjusted without first consulting a Caterpillar representative.

Transmission Style

Indicates to the ECM the type of transmission installed in the vehicle. It is also used by the ECM to determine how to read inputs (brake switch #2, clutch, and neutral switches) and whether the Allison AT/MT/HT transmission output (OUTPUT #7) is used. If an Allison AT/MT/HT (non-electronic) Transmission is installed, this parameter must be programmed to one of the AT/MT/HT Options (1-4). If any other automatic transmission, such as Allison WT, is installed, this parameter should be programmed to one of the Automatic Options (1-4).

Timer Parameters

Idle Shutdown Time

Time (in minutes) the engine will idle before shutting down. Engine will only shut down if the ECM senses 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 ignition key switch is in the OFF position.

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 to be programmed in the 3 to 1440 minute range to function (0=OFF).

A/C Switch Fan On-Time

Input #11 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 0 disables the function. Programming depends upon refrigerant and A/C system design as well use of the input. Program the timer to 1 second for connection of this input to another system also providing a time delay. This feature requires Fan Control Type programmed to On-Off.

Fan with Engine Brake On

Fan with Engine Brake On determines if the Cooling Fan will come ON when the Engine Brake has been active for at least two seconds. This feature requires the Fan Control Type programmed to On-Off with an On-Off fan installed in order to function.

Engine Monitoring Parameters

Engine Monitoring Mode

Determines the level of action taken by the ECM in response to a potential engine damaging condition. The ECM reads the Caterpillar Coolant Temperature Sensor, with Coolant Level a programmable option.

Coolant Level Sensor

Determines if the ECM monitors the Coolant Level Sensor inputs. This feature requires Engine Monitoring Mode programmed to Warning, Derate, or Shutdown

Engine Oil Pressure Sensor

An optional Engine Oil Pressure Sensor is sometimes installed on applications with an instrument cluster that requires engine oil pressure information. The 3126B engine does not require oil pressure monitoring for engine protection, because the HEUI fuel system will not allow the engine to run if oil pressure is not present. If the Engine Oil Pressure Sensor parameter is programmed to installed, the oil pressure information will be communicated over the ATA data link. If it is programmed to Not Installed (default), the ECM will not monitor the sensor input.

Maintenance 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.

PM1 Engine Oil Capacity (for Automatic Maintenance Indicator Mode)

PM1 Interval can be determined by 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

Dash - 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.

Dash - Customer Parameters

When programmed to YES, four parameters can be accessed and changed through a CAT ID Dash Display. These parameters are:

* SoftCruise

* Fast Idle RPM #1

* Fast Idle RPM #2

* Low Idle

Each parameter listed has a YES/NO option with NO as the default. In addition the CAT ID must have the EEPROM chip capable of supporting communication with 3126B HEUI engines, software version 1.3 or later. The version number is displayed initially on power-up of CAT ID.

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. If programmed to YES, 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.

Theft Deterrent Password

The password required by the ECM for the Theft Deterrent feature.

Input Selections

Input #4)

Input #4 to the ECM is available for connection of a Torque Limit Switch to limit torque when the PTO On/Off switch is in the ON or OFF position. The parameter must be programmed to Torque Limit Switch to enable this feature. This feature should only be used for temporary protection of equipment.

Input #5

Input #5 to the ECM is available for connection of a Brake/Clutch Disable Switch for applications requiring mobile use of the vehicle with a set engine rpm that does NOT require the Brake or Clutch to disengage the engine rpm set speed. The parameter must be programmed to Ignore Brake/Clutch switch to enable this feature.

Input #6

Input #6 to the ECM is available for connection of a 2-Speed Axle On/Off Switch. When a two-speed axle is used, the change in gear ratios from the main drive axle ratio alters the calibration of the vehicle speed signal. When the parameter is programmed to 2-Speed Axle Switch and the switch is in the ON position, the ECM will automatically adjust the vehicle speed calibration. This will ensure the ECM driven speedometer and the ECM stored information correctly reflect the actual vehicle speed.

Output Selections

Output #9

If Fast Idle operation is used, Output #9 will turn on a Fast Idle Enabled Lamp during Fast Idle operation, if Output #9 is programmed to Fast Idle Lamp (default). This requires the Fast Idle RPM #1 and optional Fast Idle RPM #2 parameters to be programmed to a value above low idle and a momentary switch to be installed on Input #18 (Fast Idle Enable Switch). If the Output #9 parameter is programmed to Wait to Start Lamp, the output is used to turn on a lamp when the Intake Air Heater is ON and the engine is not running.

Fan Control Type

If the ECM is used to operate the cooling fan relay (or solenoid) this parameter must be programmed to On-Off. Options are NONE (default) and On-Off for an On-Off type fan drive. This parameter should be programmed to NONE if the ECM is not connected to/operating the cooling fan relay (or solenoid). When programmed to NONE the service technician can use an Electronic Service Tool to determine the ECM is not connected to the fan circuit.

Data Link Parameters

Powertrain Data Link

The data link parameter Powertrain Data Link determines if the ECM will communicate to a powertrain device using the SAE J1939 data link. 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 programmed to NONE.

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 without a SAE J1939 powertrain component ECM on the vehicle to communicate with the engine ECM.