STRIKER AS 8T4157 - Caterpillar

Illustration 1 g01142799
Schematic of the Auxiliary Pedal Position Sensor (attachment)This diagnostic code is associated with the auxiliary pedal position sensor. The FMI 04 means that the ECM has determined that the voltage of the signal circuit for the position sensor is below .25 VDC. The possible causes of this diagnostic code are listed below:
The signal circuit for the sensor is shorted to ground.
The sensor has failed.
The ECM has failed. This is unlikely. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1130 FMI 04 is active before performing this procedure. System Response:When the CID 1130 FMI 04 diagnostic code is active, the machine response will be:
The warning indicator on the Monitor will illuminate.
The attachment that is controlled by the left attachment pedal will not operate.Test Step 1. CHECK THE SENSOR
Turn the disconnect switch and the key start switch to the ON position.
Observe the status of the diagnostic code. Disconnect the sensor from the machine harness.Expected Result:The CID 1130 FMI 04 remains active. The FMI 04 code has not changed and is still active.Results:
OK - The diagnostic code remains active. The sensor is correct. Proceed to Test Step 2.
NOT OK - The diagnostic code is no longer active. The sensor has failed.Repair: Replace the auxiliary pedal position sensor. Stop.Test Step 2. CHECK THE WIRING HARNESS OF THE SENSOR FOR A SHORT TO GROUND.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the sensor.
Disconnect the machine harness connectors from the ECM.
At the machine harness connector for the ECM, measure the resistance from the signal contact J1-62 (wire M955-BR) to all other ECM connector ground contacts. The ground contacts on connector J2 are J2-2, J2-12, J2-13, J2-22, J2-36, J2-37, J2-46, J2-49, J2-52, J2-56, J2-59 and J2-69. The ground contact on connector J1 is J1-9.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - One or more resistance measurements is not correct. There is a short in the machine harness. Repair: The short is between signal contact J1-62 (wire M955-BR) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness. Stop.Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the contacts of the harness connectors and clean the contacts.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 1130 FMI 04.Expected Result:The CID 1130 FMI 04 is active. Results:
YES - The CID 1130 FMI 04 is active. The diagnostic code has not been corrected. The ECM may have failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. See