This diagnostic code is associated with system voltage of the electrical system.
This diagnostic code is recorded when the power train ECM reads the electrical system voltage that is at contact J1-1 as being below normal range (less than 18 volts for two seconds).
The possible causes of this diagnostic code are listed:
- A charging system component has failed.
- The ECM has failed. This is unlikely.
This diagnostic code causes the transmission to not shift because the voltage is too low in order to energize the shift solenoids.
Ensure that CID 0168 FMI F01 is on hold. The "SERV CODE" indicator is illuminated.
Test Step 1. CHECK THE BATTERY VOLTAGE
- Measure the voltage at the battery posts.
Expected Result:
The voltage measures battery voltage.
Results:
- YES - The voltage is greater than 18 DCV. This should not cause the diagnostic code. Proceed to test step 2.
- NO - The voltage is less than 18 DCV. The charging system is not correct.
Repair: Check the charging system. See Special Instruction, REHS0354, "Charging System Troubleshooting".
Stop.
Test Step 2. CHECK THE SYSTEM VOLTAGE
- Disconnect the machine harness from the ECM.
- Turn the disconnect switch and the key start switch to the ON position.
- At machine harness connector J1 for the ECM, measure the voltage between contact J1-1 and contact J1-2.
Expected Result:
The voltage measures battery voltage.
Results:
- YES - The voltage is greater 18 DCV. This should not cause the diagnostic code.
Repair: Inspect connector J1. Connect the machine harness to the ECM. If the CID 0168 FMI F01 remains present, check the charging system. See Special Instruction, REHS0354, "Charging System Troubleshooting". If the cause of the diagnostic code is not found, replace the power train ECM. See Testing And Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NO - The voltage is less than 18 DCV. The machine harness has failed.
Repair: Check the +battery circuit and the ground circuit in the machine harness. Repair the machine harness or replace the machine harness.
Stop.