PUMP GP-FUEL INJECTION 2803893 - Caterpillar

Illustration 1 g02173953
Schematic for the "Right Side Auxiliary" pedal sensor
This diagnostic code is associated with the Right Side Auxiliary pedal sensor. An FMI 04 diagnostic code means the Machine ECM has determined the signal output voltage of the sensor is below normal. Possible causes of this diagnostic code are:
The sensor may have failed.
The sensor output signal circuit may be shorted to ground.
The Machine ECM may have failed, but is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes now, but clear those codes after the original diagnostic code has been corrected. Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all of the harness connectors involved in the circuit. Verify that all of the connections in the circuit are clean, secure, and in good condition. If a problem is found with any of the connections: correct the problem and verify that diagnostic code CID 1129 FMI 04 is still active, before performing the following procedures. Test Step 1. CHECK THE SENSOR, THE ECM, AND THE CIRCUIT CONNECTIONS IN THE MACHINE HARNESS.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the Right Side Auxiliary pedal sensor.
Turn the key start switch and the disconnect switch to the ON position. Do not start the engine.
Observe the status of the diagnostic code. Expected Result:The CID 1129 FMI 04 diagnostic code remains active. Results:
YES - The CID 1129 FMI 04 diagnostic code remains active. Disconnecting the sensor did not change the code. The sensor is NOT the cause of the problem. Repair: The machine harness has failed, or the ECM may have failed.Go to Test Step 2.
NO - The CID 1129 FMI 04 diagnostic code is no longer active, and has been replaced by an active CID 1129 FMI 03 diagnostic code. The ECM has detected a valid diagnostic code. Repair: The ECM, and the harness, are correct. The sensor has failed. Replace the sensor. Go to Test Step 3Test Step 2. CHECK THE SENSOR OUTPUT SIGNAL FOR A SHORT TO GROUND.
Turn the disconnect switch and the key start switch to the OFF position.
At the Machine ECM, disconnect the J1 and J2 machine harness connectors from the ECM.
The harness connector remains disconnected from the Right Side Auxiliary pedal sensor.
At the J1 harness connector for the ECM, measure the resistance between contact J1-54 (N795-WH(White)) and all of the other contacts used in the ECM harness connectors. Expected Result:Each resistance is more than 5000 ohms.Results:
YES - Each resistance is more than 5000 ohms. The sensor output signal circuit is not shorted to ground. Go to Test Step 3.
NO - One of the resistance measurements is NOT more than 5000 ohms. There is a short in the harness. The short is between the sensor output signal wire and the wire with the low resistance. Repair, or replace, the harness. Go to Test Step 3. Test Step 3. CHECK IF THE DIAGNOSTIC CODE IS