GLASS 9R1819 - Caterpillar

Illustration 1 g02644377
Connections of Supply Voltage Circuit for Implement ECM
The CID 0168 diagnostic code is associated with the machine system voltage that is supplied to the Implement ECM. The FMI 03 means that the ECM has detected that the system voltage is above normal. The ECM activates this diagnostic code when the system voltage is above 32 VDC.The possible causes of this diagnostic code are listed below:
The alternator output is above normal.
The ECM has failed or the operating software is not the latest version. ECM failure is the least likely cause. Note: If the Transmission ECM or other control modules on the machine have all activated a CID 0168 FMI 03 diagnostic code for system voltage, the most likely cause is a problem with the system voltage supply that is provided by the alternator.Note: A digital multimeter will be required for the measurements in this procedure.Test Step 1. CHECK THE SYSTEM VOLTAGE AT THE ECM
Turn the disconnect switch and the key start switch to the OFF position.
At the J1 harness connector for the Implement ECM, use the 7X-1710 Multimeter Probes to measure the supply voltage. Insert the positive probe along one of the positive power supply circuit wire at contact J1-31 (wire 167-OR(Orange)). Insert the negative probe along one of the supply return circuit wires at contact J1-13 (wire 272-BK(Black)).
Start the engine and run the engine at high idle.
Measure the voltage between contact J1-31 and contact J1-13. Expected Result:The voltage measurement is in the range of 18 VDC to 32 VDC.Results:
OK - The voltage measurement of the ECM power supply is in the range of 18 VDC to 32 VDC. The system voltage is correct. There does not appear to be a problem with the alternator or the machine power supply circuits. Proceed to Test Step 2.
NOT OK - The voltage measurement of the ECM power supply is greater than 32 VDC or less than 18 VDC.Repair: The operation of the alternator is not correct. Refer to Special Instruction, REHS0354, "CHARGING SYSTEM TROUBLESHOOTING" for further assistance.STOPTest Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Turn the disconnect switch and key start switch to the OFF position.
Reconnect any harness connectors that were disconnected and checked.
Turn the disconnect switch and the key start switch to the ON position.
Start the engine and run the engine at high idle.
Determine if the CID 0168 FMI 03 diagnostic code is active. Expected Result:The CID 0168 FMI 03 diagnostic code is not active.Results:
OK - The CID 0168 FMI 03 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code could have been caused by a momentary condition that reset when the machine was restarted. Resume normal operation.STOP
NOT OK - The CID 0168 FMI 03 diagnostic code is still active. The diagnostic code has not been corrected.Repair: If the system voltage is correct and the ECM is still activating this diagnostic code, the ECM could be causing the problem.Ensure that the latest version of software is loaded on