Usage:
Customer Specified Parameters allow a customer to restrict how a driver operates the vehicle. Some parameters may affect engine operation in ways that the Inadequately trained driver does not expect. These parameters may lead to power or performance complaints, even when the engine is performing to specification.
For detailed instructions on how to program a 3176 for optimum performance and fuel economy, refer to LEKT8587, Developing Parameters For The 3176 Diesel Truck Engine.
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. The parameter value shown in BOLD is the programmed setting if the feature is not used.
Vehicle Speed Cal:
Used by the ECM to scale vehicle speed reading into miles per hour. Programmed in pulses per mile. Incorrect programming of this parameter will cause the Engine Control and Speedometer to interpret the vehicle speed sensor signal differently. This would cause Cruise Control operation malfunctions.
Minimum 14,000 PPM
Maximum 65,535 PPM
Default 14,000 PPM
Vehicle Speed Limit (VSL):
Top vehicle speed the ECM will permit. The ECM will shut off fuel above this speed. This could be misinterpreted by the driver as an engine power problem if misunderstood.
Minimum 30 mph
Maximum 127 mph and/or gear limit of truck
Default 127 mph
Engine RPM at VSL:
Maximum rpm that the engine will operate at when the vehicle speed signal reaches the programmed Vehicle Speed Limit (VSL), or when there is an ECM detected vehicle speed signal problem.
Minimum 1300 rpm
Maximum 3000 rpm
Default 3000 rpm
Low Cruise Limit:
The lowest mph at which cruise can be engaged. The ECM will ignore attempts to set Cruise speed below the value of this parameter.
Minimum 15 mph
Maximum 127 mph
Default 127 mph
High Cruise Limit:
The highest mph at which cruise can be engaged. The ECM will ignore attempts to set Cruise speed above the value of this parameter.
Minimum 30 mph
Maximum 127 mph
Default 127 mph
Cruise Switch Configuration:
Defines operation of the SET/RESUME switch while it is held in position. This feature affects the action of the ECM to "holding" or "bumping" the SET/RESUME Switch in the SET or RESUME position.
Default SET/ACCEL - RESUME/DECEL
Alternative SET/DECEL - RESUME/ACCEL
NOTE: This feature is not available on Personality Modules dated before October 1991.
Engine Retarder Mode:
Defines operation of "Retarder Enable" signal while the Cruise ON/OFF switch is ON. Allowable options are: COAST or LATCH. When programmed to Coast, the retarder is enabled only while the service brakes are being applied. When programmed to Latch, the retarder stays enabled after the service brakes are released (a quick press of the brake pedal latches the retarder ON). The default setting is Coast.
PTO Mode Speed Limit:
Maximum mph for PTO mode. If the ECM interprets the vehicle is exceeding this parameter, the vehicle will either not allow the vehicle to use PTO mode, or if in PTO mode it will cause the ECM to kick out of PTO mode
Minimum 1 mph
Maximum 15 mph
Default 1 mph
PTO Mode RPM Limit:
Maximum engine rpm in PTO mode. The ECM will ignore attempts to set a PTO engine rpm above this parameter value. If the parameter were set to or below the Low Idle parameter value, PTO would not operate.
Minimum 600 rpm
Maximum 3000 rpm
Default 3000 rpm
Progressive Shifting Parameters
Low Gears #1 RPM Limit:
Engine rpm limited below "Low Gear #1 Turn Off". 3176 will hesitate at this rpm, then allow slow acceleration up to Top Engine Limit. This is to encourage the driver to shift to the next highest gear.
Minimum 1100 rpm
Maximum 3000 rpm
Default 3000 rpm
Low Gears #1 Turn Off:
Vehicle Speed where "Low Gears #1 RPM Limit" turns off. This must be matched with "Low Gear #1 RPM Limit" to the specific drive train for best performance.
Minimum 3 mph
Maximum 30 mph
Default 3 mph
Low Gears #2 RPM Limit:
Similar to "Low Gears #1 RPM Limit". Typically programmed to slightly higher rpm.
Minimum 1100 rpm
Maximum 3000 rpm
Default 3000 rpm
Low Gears #2 Turn Off:
Similar to "Low Gears #1 Turn Off". Typically programmed to a slightly higher vehicle speed.
Minimum 0 mph
Maximum 50 mph
Default 50 mph
High Gear RPM Limit:
Engine RPM Limit when vehicle speed is above "High Gear Turn On Speed". This is a "hard" limit: 3176 will not power the engine above this limit. This is to encourage the driver to shift up into overdrive or top gear. It could be misinterpreted into a power complaint.
Maximum 3000 rpm
Minimum 1300 rpm
Default 3000 rpm
High Gear Turn On Speed:
Vehicle Speed where "High Gear RPM Limit" turns on. This must be matched to the specific drive train for best performance.
Maximum 127 mph
Minimum 30 mph
Default 127 mph
Rating Number:
Number of rating within horsepower family. The Personality Module defines the horsepower family (such as 325 hp) and may contain several ratings within that family. The rating number defines which rating is used (such as 325 hp @ 1900 rpm or 325 hp @ 2100 rpm) within the family.
Top Engine Limit:
Maximum engine rpm when the engine is under load. The engine will still achieve Rated rpm under no load conditions. NOTE: TEL is dependent upon the RATING number, with some RATING numbers allowing no or little variation as specified below.
Minimum 1300 rpm
Maximum 3000 rpm
Default 1820 rpm
Low Idle RPM:
Minimum engine rpm.
Minimum 600 rpm
Maximum 750 rpm
Default 700 rpm
Idle Shutdown Time:
Time (in minutes) that engine will idle before shutting down. Engine will only shutdown if 3176 sees no engine load, no vehicle speed, and the parking brake is set. If this parameter is programmed to zero, this feature is disabled and the engine will idle until the key switch is turned OFF. (Note: this feature does not shut down vehicle power- the ECM and vehicle remain powered.)
Minimum 3 min.
Maximum 60 min.
Default 0 min.
Vehicle ID:
Identification of the vehicle assigned by the customer. Used only for customer reference: not required by the ECM.
Engine Protection 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, or OEM Coolant Level (if installed and enabled) Sensors. The Caterpillar Engine Protection System operates only when the engine is running.
Default WARNING
Alternative OFF
Alternative DERATE
Alternative SHUTDOWN
Coolant Level Sensor Enable/Disable:
Determines if the ECM monitors the Coolant Level Sensor inputs.
Default ENABLED
Alternative DISABLED