WHEEL ASSEM. (Not Serviced) 8V6392 - Caterpillar

Illustration 1 g02075095
Schematic of the +5 v Sensor Supply from the Machine ECMThis diagnostic code is associated with the Machine ECM 5 v sensor power supply. The 5 v sensor power supply provides power to the Counterbalance Pressure Sender.The CID 0262 FMI 03 diagnostic code is activated when the Machine ECM detects that the voltage of the 5 v power supply circuit is higher than normal.Note: The Machine ECM is located inside the Center Console.The following conditions could cause this diagnostic code:
The power supply circuit is shorted to a higher voltage source.
The ECM has failed. This situation 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, secure, and 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 problem has been corrected. Verify that the CID 0262 FMI 03 is active before performing this procedure.System Response:Components connected to the controller will not log faults.Test Step 1. CHECK THE POWER SUPPLY AT THE MACHINE ECM
Turn the disconnect switch and the key start switch to the OFF position.
At the Machine ECM connector J1, remove the +5V supply socket at contact J1-11. Remove the return socket at contact J1-21. The Machine ECM Harness connector J1 remains connected to the ECM.
Turn the disconnect switch and the key switch to the ON position.
Use the multimeter probes in order to make contact on the Machine ECM connector pins. Measure the voltage at the ECM between the power supply contact J1-11 and the return contact J1-21.Expected Result:The voltage measurement is 5.0 0.4 DCV.Results:
OK - The voltage measurement is 5.0 0.4 DCV. The voltage is correct. The ECM power supply is correct. Turn the key start switch and the disconnect switch to the OFF position. Install the wires and sockets that were removed from the J1 connector back into the original locations. Proceed to Test Step 2.
NOT OK - The voltage measurement is less than 5.0 0.4 DCV. The ECM power supply is not correct.Repair: Prior to replacing an ECM, always contact the Technical Communicator from your dealer 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".STOPTest Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation caused by excessive heat, corrosion, or chafing.
Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 0262 FMI 03 diagnostic