HEAD 4J5668 - Caterpillar

Illustration 1 g01322917
Connections of the position sensor for the brake and decelerator pedalThis diagnostic code is associated with the position sensor of the brake and decelerator pedal. This diagnostic code is recorded when the ECM reads the sensor signal as being below normal.The possible causes of this diagnostic code are listed:
The wire to the sensor supply is open.
The signal circuit is shorted to ground.
The sensor has failed.
The ECM has failed. This is unlikely. Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean. Verify that all connections in the circuit are secure. Verify that all connections in the circuit are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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 CID 2305 FMI 04 is active before performing this procedure.System Response:A level 2 warning will be generated. The functionality is lost and maximum machine speed is limited. The ECM will force the machine in neutral interlock and the ECM will restrict any machine movement if the brake pedal switch has an active diagnostic code.Test Step 1. CHECK THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Ensure that the diagnostic code is active.
Disconnect the sensor from the machine harness.
Observe the status of the diagnostic code. Expected Result:The diagnostic code will remain active.Results:
OK - The diagnostic code remains active. The sensor has not failed. The machine harness may have failed or the ECM may have failed. Proceed to test step 2.
NOT OK - The diagnostic code is NO longer active. The sensor has failed.Repair: Replace the sensor. Recalibrate the sensor, if necessary. Refer to Testing and Adjusting, KENR6172, "Calibration" procedure. Verify that the new sensor corrects the problem.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND.
The sensor remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the J1 and J2 machine harness connector from the ECM.
At the J1 machine harness connector, measure the resistance from contact J2-24 (wire M730-YL) to all contacts that are used in the machine harness connectors for the ECM.Expected Result:The resistance is greater than 5000 ohms for each measurement.Results:
OK - The resistance is greater than 5000 ohms for each measurement.Repair: Check the circuit again. It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".STOP
NOT OK - The resistance is less than 5000 ohms for