| Exceeding road speed governor set speed down hills |
Cruise control or road speed governor lower droop is set too high. |
Change the cruise control or road speed governor lower droop to a lower value. If the problem continues, change the cruise control engine brake activation to lower value. |
| Poor acceleration up hills |
Cruise control and/or road speed governor upper droop is set too high. |
Change the cruise control or road speed governor upper droop to a lower value. |
| Cruise control turns on automatically |
Cruise control auto-resume feature is enabled. |
Turn off the cruise control auto-resume feature. |
| Exhaust brakes turn on automatically |
Cruise control auto engine brake feature is enabled or exhaust brake switch has failed close. |
Turn off the cruise control auto engine brake feature or repair the switch. |
| Unable to obtain maximum vehicle speed |
Gear-down protection feature is enabled. |
Turn off or adjust the gear-down protection parameters. |
| Poor clutch engagement |
The low idle speed is set too low for the application. |
Increase the low-idle speed using the idle adjust switch. Refer to Procedure
019-052. Increase the low-idle speed parameter. |
Speedometer on the dashboard is
not correct or vehicle exceeding road speed governor set speed |
Vehicle speed parameters
not correct. |
Make sure the following are correct: tire size, rear axle ratio, vehicle speed sensor type, and gear teeth per revolution. |
Trip information mileage readings are
not correct |
The tire size parameter was changed without resetting the trip information system. |
Set the trip information system again whenever the tire size parameter is changed. |
Can
not obtain maximum vehicle speed with semiautomatic transmission |
The gear-down protection parameters are
not correct. |
Change the top gear ratio parameter to be equal to the first gear-down ratio,
not the top gear ratio. For example, on a transmission with a 0.75, 0.87, and 1.0 ratio set, the top gear ratio parameter
must be set to 0.87. |
| Engine won’t start |
Antitheft password active. |
Enter antitheft personal identification number (PIN) using RoadRelay™ or delete password with Zap-It. |
| Low power in lower gears or top gear |
Power train protection parameters set too low. |
Change power train protection torque limits to match torque capability of the vehicle’s transmission. |
Semiautomatic transmission will
not shift into top gear |
Top gear ratio setting does
not match top gear of transmission. |
Using INSITE™ electronic service tool, set the proper top gear ratio. |
| Centinel™ feature has been turned on but vehicle has a Spicer Top 2™ transmission. |
Turn off the Centinel™ feature and turn on the Top 2 feature using INSITE™ electronic service tool. |
Engine recently started overheating because the fan will
not turn on |
Fan control feature is
not set properly. |
Verify all fan control feature parameters are properly set for the vehicle. |
Fan will
not turn off |
Fan control feature is
not set properly. |
Verify all fan control feature parameters are properly set for the vehicle. |
Fan control switch will
not turn on the fan |
Fan control 1 accessory switch control is turned off. |
Turn on fan control 1 accessory switch control using INSITE™ electronic service tool. |
| Unable to obtain maximum vehicle speed |
Cruise control maximum vehicle speed or accelerator maximum vehicle speed
not set high enough. |
Verify or change settings using INSITE™ electronic service tool. |
| Driver reward system is penalizing the driver with reduced top vehicle speed or cruise control maximum speed for poor fuel economy or extended idle time. |
Explain feature to the driver or change parameter settings to more appropriate values. |
| Accelerator pedal has no effect on engine speed |
Vehicle is in PTO mode and PTO accelerator override is turned on in the ECM. |
Turn off PTO accelerator override using INSITE™ electronic service tool. |
| Vehicle has a multiplexed throttle pedal and the multiplexing feature has been turned off. |
Verify that the throttle pedal is multiplexed. Turn on the multiplexing feature for the throttle pedal using INSITE™ electronic service tool. |
| Remote accelerator control has no effect on engine speed |
Remote accelerator feature has been turned off. |
Turn on the remote accelerator feature using INSITE™ electronic service tool. |
| Vehicle has a multiplexed remote accelerator control and the multiplexing feature has been turned off. |
Verify that the remote accelerator control is multiplexed. Turn on the multiplexing feature for the remote throttle control using INSITE™ electronic service tool. |
Lamps do
not operate |
5 A or 15 A Power fuse in engine harness blown. |
Check fuses and verify the ECM is getting power on the keyswitch wire. |
| Vehicle has multiplexed lamps and the multiplexing feature has been turned off. |
Verify that the lamps are multiplexed. Turn on the multiplexing feature for the lamps using INSITE™ electronic service tool. |
Engine brakes do
not operate |
Vehicle has multiplexed engine brake switches and the multiplexing feature has been turned off. |
Verify that the engine brake switches are multiplexed. Turn on the multiplexing feature for the engine brake switches using INSITE™ electronic service tool. |
Engine will
not respond to one or all of the operator’s switch(es) |
Vehicle has multiplexed switches and the multiplexing feature has been turned off. |
Verify that the switches are multiplexed. Turn on the multiplexing feature for the switches using INSITE™ electronic service tool. |
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