The probable root causes are listed in order below:
- Electrical connections
- Engine Monitoring
- Battery power or ground to the ECM
- Electronic system
- Accelerator pedal position sensor
- Vehicle speed signal
- Power train data link
- Fuel supply
- Torque limit switch
- Low injection actuation pressure
Perform the following diagnostic procedures in order:
Check the vehicle harness and the connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
- Check the parameters for "Engine Monitoring".
- Connect the electronic service tool to the cab data link connector.
- Check for diagnostic codes that can derate the engine when "Engine Monitoring" is programmed to "Derate" or "Shutdown".
- 110-00 High Coolant Temperature Warning (61)
- 110-11 Very High Coolant Temperature (61)
- 111-11 Very Low Coolant Level (62)
- 110-00 High Coolant Temperature Warning (61)
Battery Power or Ground to the ECM
- Ensure that the following connectors have been installed correctly:
- ECM connectors (J1/P1 and J2/P2)
- Injector connector (J300/P300)
- Camshaft position sensor connector (J401/P401 and J402/P402)
- ECM connectors (J1/P1 and J2/P2)
- Use the electronic service tool to check for a diagnostic code 168-02 (Intermittent Battery Power to the ECM). Check the power connections for the ECM and the ground connections for the ECM. If a problem is suspected, wire a bypass. Refer to Troubleshooting, "Ignition Key Switch Circuit and Battery Supply Circuit - Test"(51).
- Connect the electronic service tool to the cab data link connector.
- 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 "Vehicle Speed Signal".
- The fuel position is equal to the rated fuel limit.
- 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, turn the ignition key switch to the ON position. Check the boost pressure on the electronic service tool status screen.
When the engine is off, the boost pressure should be 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 programmed 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. 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 idle
Also, 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".
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".
- Check the "Powertrain Data Link". Ensure that the SAE J1939 data link is not limiting the power.
- Connect the electronic service tool to the cab data link connector.
- Monitor the "Powertrain Data Link" status screen while the vehicle is experiencing problems.
If the "Powertrain Data Link" status screen indicates that the data link is limiting the power or the rpm, verify that the limit is not normal operation. If the limit is not normal operation, refer to the vehicle OEM for repairs.
- Monitor the exhaust for smoke while the engine is being cranked.
If no smoke is present, there may be a problem with the fuel quality or there may be a problem with the fuel supply.
- Check the fuel quality.
- Check the fuel pressure. Refer to Testing and Adjusting, "Fuel System Pressure - Test".
- Ensure that the fuel system has been primed. Refer to Testing and Adjusting, "Fuel System - Prime".
- Check for fuel supply lines that are restricted.
- Check the fuel filters.
- If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).
- Check for air in the fuel system. Refer to Testing and Adjusting, "Air in Fuel - Test".
- Connect the electronic service tool to the cab data link connector.
- Check the setting for the Customer Parameter for the "Torque Limit".
If the "Torque Limit" is programmed below 2712 N·m (2000 lb ft), check the status screen for the torque limit switch. Ensure that the status screen indicates that the torque limit switch is off. If the status of the torque limit switch is on and a "Torque Limit" is programmed, the system is operating correctly. If the switch that is connected to this signal input is not switching on and switching off, refer to Troubleshooting, "PTO Switch Circuit - Test".
Low Injection Actuation Pressure
- Check the engine oil level. Engine oil is used to activate the high pressure hydraulic pump.
- Ensure that the engine oil meets the recommendations of the engine manufacturer. Refer to Operation and Maintenance Manual for further details.
- Crank the engine and monitor the injection actuation pressure and the output of the injection actuation pressure control valve. The high-pressure oil system is operating properly if the pressure output is a minimum of 6 MPa (870 psi).
- Connect the electronic service tool to the cab data link connector and check for event code 164-11 injection actuation pressure system fault . If a 164-11 event code has been logged recently, refer to Troubleshooting, "Injection Actuation Pressure -Test".