CAMSHAFT GP 3367516 - Caterpillar

Illustration 1 g02145600
Connections of the 8 VDC power supply
This diagnostic code is associated with the 8 VDC power supply. The FMI 03 is recorded when the ECM reads the voltage of the supply circuit as higher than the normal voltage.The possible causes of this diagnostic code are listed:
The voltage supply is shorted to a higher voltage source.
A component that uses the supply has failed.
The ECM has failed. An ECM failure is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0041 - FMI 03 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. Check the Sensors
One at a time, disconnect each sensor from the machine harness.
Check if the Diagnostic Code remains active. Expected Result:The Diagnostic Code is not active when a sensor is disconnected.Results:
YES - The Diagnostic Code is not active when a sensor is disconnected. This sensor has failed.Repair: Replace the sensor.STOP
NO - The Diagnostic Code remains active. Proceed to Test Step 2.Test Step 2. Check the supply voltage at the ECM
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the J1 machine harness connector from the ECM.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Insert multimeter probes into the back of the ECM at contact J1-44 and contact J1-45. Measure the voltage that is supplied by the ECM. Expected Result:The voltage is 8 0.5 VDC.Results:
YES - The voltage is 8 0.5 VDC. The sensor supply voltage is correct. Proceed to Test Step 3.
NO - The voltage is greater than 8 0.5 VDC. The voltage that is supplied by the ECM is not correct.Repair: Prior to replacing an ECM, always contact your technical communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the cause of the diagnostic code is not found, replace the ECM. Refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".STOPTest Step 3. Check the supply voltage at each sensor
Connect the J1 machine harness connector to the ECM.
Turn the disconnect switch and the key start switch to the ON position.
At the machine harness connector for each sensor, measure the voltage from the power supply (wire C985-BU(Blue)) to the power return (wire J766-PU(Purple)). Measure the voltage from power supply (wire C985-BU(Blue)) to frame ground. Expected Result:Both voltage measurements are 8 0.5 VDC.Results:
YES - Both voltage measurements are 8 0.5 VDC. The voltage is correct. Proceed to Test Step 4.
NO - The machine harness has failed in the circuit that does not read 8 0.5 VDC.Repair: Refer to Electrical System Schematic, KENR8916. Examine all of the connection points in the return circuit for the sensor. Ensure that all of the connections are clean and secure. Make sure that the connections are in good condition. Repair the machine harness or