CONTROL GP-ENGINE ELECTRONIC 3482393 - Caterpillar

Illustration 1 g01432450
System Voltage connections
This diagnostic code is recorded when the system voltage is below 22.0 VDC. When this code is active, the ECM will apply the brake and will shift the transmission into NEUTRAL. The possible causes of this diagnostic code are listed below:
The Machine ECM fuse is open.
The wiring in the machine harness has failed.
A charging system component has failed.
The ECM has failed. This is unlikely. Test Step 1. CHECK THE BATTERY VOLTAGE
Start the engine and run at high idle for several minutes.
Measure the battery voltage at the battery posts. Expected Result:Battery voltage should be greater than 22.0 VDC. Results:
OK - Battery voltage is greater than 22.0 VDC. Battery voltage is correct. Proceed to Test Step 2.
NOT OK - Battery voltage is less than 22.0 VDC.Repair: The charging system is not correct. Check the charging system. See System Operation, SENR2947, "Starting and Charging System".STOPTest Step 2. CHECK THE SYSTEM VOLTAGE AT THE ECM
The engine must still be running at high idle.
DO NOT DISCONNECT the machine harness from the ECM. At connector "J1" of the ECM, prepare to make a voltage measurement by using the 7X-1710 Multimeter Probe.
The + battery power connects to the ECM at four contacts on the J1 connector. Refer to the connection diagram at the beginning of this procedure. At the machine harness connector J1 for the ECM, insert the probes into the back of one of the contacts for wire 140-RD(Red) and J1-13 (202-BK(Black)). Measure the voltage (VDC). Expected Result:Voltage should be greater than 22.0 VDC. Results:
OK - Voltage is greater than 22.0 VDC. Battery voltage is correct. Proceed to Test Step 3.
NOT OK - Voltage is less than 22.0 VDC.Repair: The machine harness is not correct. Refer to the Electrical System Schematic for your machine that is in the Service Manual. Ensure that the Machine ECM fuse is not open. Check all machine harness connectors that are involved in the circuit for tight connections or corrosion. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Remove connectors "J1" and "J2" from the ECM. Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the key start switch to the ON position.
Enter service mode of the Caterpillar Monitoring System and clear all inactive diagnostic codes.
Operate the machine.
Determine if CID 0168 FMI 04 is present. Expected Result:CID 0168 FMI 04 is present. Results:
YES - CID 0168 FMI 04 is present. Repair: Exit this procedure and perform the diagnostic code procedure again. If the problem persists, the ECM may have failed. Prior to replacing an ECM, always contact your dealership's 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. See the Troubleshooting, "Electronic Control Module (ECM) - Replace".STOP
NO - CID 0168 FMI 04 is not present.Repair: The diagnostic code is NOT present. The problem does not exist at this time. The initial problem was