DISC-FRICTION 4430663 - Caterpillar

Probable Causes
The probable root causes are listed in order below:
Active diagnostic codes
Soft cruise control
Poor electrical connections
Battery power or ground to the Engine Control Module (ECM)
Air inlet system (boost)
Accelerator pedal position sensor
Fuel supply
Vehicle speed circuit
Power train control
Torque limit switchRecommended Actions
Perform the following diagnostic procedures in order:
Certain diagnostic codes may cause poor performance. These diagnostic codes are intended to protect the engine.
Connect the Caterpillar Electronic Technician (ET) to the data link connector.
Check for active codes and/or logged codes. Troubleshoot any codes that are present before continuing with this procedure.
If the problem only occurs in cruise control, check the parameter for "Soft Cruise Control".
Disable the "Soft Cruise Control" parameter.
Verify that the problems do not return.
If the problems do not return, the problem was due to normal operation. Soft cruise control provides an 8 km/h (5 mph) operating range around the cruise control set speed in order to provide a smoother cruise control.
Enable the "Soft Cruise Control".
Check the vehicle harness and the connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Check the battery power and the ground circuit to the ECM.
Ensure that the following connectors have been installed correctly:
J1/P1 and J2/P2 ECM connectors
Valve cover connectors for the unit injectors
Primary engine speed/timing connectors
Secondary engine speed/timing connectors
Check for an electronic system problem.
Monitor the fuel position, the Rated Fuel Limit and the FRC Fuel Limit. While the vehicle is operating under full load, the parameters should meet the following conditions:
The fuel position is equal to the Rated Fuel Limit.
The fuel position is less than the FRC Fuel Limit.If the fuel position is equal to the Rated Fuel Limit and the fuel position is less than the FRC Fuel Limit, the Electronics are operating correctly. Go to Step 7.
If the fuel position is not equal to the Rated Fuel Limit and/or the fuel position is not less than the FRC Fuel Limit, perform the following tests in order:
Turn the keyswitch to the ON position. Check the boost pressure on the status screen on Cat ET. While the engine is not started, the boost pressure should be 0 kPa (0 psi).
Monitor the status of the accelerator pedal position sensor. Operate the engine at high idle with the vehicle in neutral. If the engine can not reach the programmed "Top Engine Limit", check the duty cycle of the accelerator pedal position in order to ensure that the signal is within calibration (75 to 90 Percent at high idle).If the accelerator pedal position is unstable, check the duty cycle of the accelerator pedal position. Check the duty cycle of the accelerator pedal position by slowly operating the accelerator pedal in order to verify that the accelerator pedal position sensor is within calibration. The accelerator pedal position sensor is within calibration when both of the following conditions are met:
10 to 22 percent at low idle
75 to 90 percent at high idleAlso, ensure that the duty cycle changes as the pedal position changes. If a problem with the accelerator pedal position sensor is suspected, refer to Troubleshooting, "Accelerator Pedal (Throttle) Position Sensor