TUBE 2303862 - Caterpillar

Probable Causes
Diagnostic codes
Electrical connections
Engine monitoring
Electronic system
Accelerator pedal position sensor
Vehicle speed signal
Power train data link
Fuel supply
Torque limit switch
Low injection actuation pressureRecommended Actions
Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the data link connector.
Check for active diagnostic codes. Repair any diagnostic codes that are present before continuing with this procedure. Electrical Connectors
Check the connectors for the Engine Control Module (ECM). Also check the vehicle harness connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Ensure that the following connectors have been installed correctly:
J1/P1 ECM connector
J2/P2 ECM connector
J300/P300 injector connector
J401/P401 primary engine speed/timing sensor connector
J402/P402 secondary engine speed/timing sensor connectorEngine Monitoring
Check the "Engine Monitoring Mode" parameter.
Verify that the "Engine Monitoring Mode" parameter is programmed to the desired option:
"Warning"
"Derate"
"Shutdown"Electronic System
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. Proceed to "Fuel Supply".
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:
When the engine is off, place the keyswitch in the ON position. Check the boost pressure on the status screen. When the engine is off, the correct boost pressure is 0 kPa (0 psi).Accelerator Pedal Position Sensor
Monitor the status of the accelerator pedal position sensor. Operate the engine at high idle with the vehicle in neutral.If the engine cannot reach the top engine limit, check the duty cycle of the accelerator pedal position sensor in order to ensure that the duty cycle 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 sensor. Check the duty cycle of the accelerator pedal position sensor 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 Circuit - Test".Vehicle Speed Signal
Monitor the vehicle speed signal. Ensure the accuracy of the vehicle speed signal by comparing the vehicle speed signal to the actual vehicle speed.If the vehicle speed is greater than the "VSL", the power is limited. If a problem is discovered, refer to Troubleshooting, "Vehicle Speed and Speedometer Circuit - Test".Power Train Data Link
Check the "Powertrain Data Link". Ensure that the power train data link is not limiting the power.
Monitor the "Powertrain Data Link" status screen while the vehicle is experiencing problems.