HEAD 6E1250 - Caterpillar

Illustration 1 g00714806
Schematic of the charging systemThis diagnostic code is associated with the charging system.FMI 00 is recorded when the shift lever transmission control senses a voltage that is above 16 VDC. The voltage is identified by the diagnostic circuit.Note: Ensure that CID 0168 FMI 00 is active. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting".Test Step 1. CHECK THE SYSTEM VOLTAGE AT THE ECM.
Start the engine and operate the engine at a high idle.
Measure the system voltage between the contact 1 and contact 2.Expected Result:The voltage is below 16 VDC.Results:
YES - Ensure that the diagnostic code is NOT present. The system is operating correctly. Stop.
NO - Proceed to test step2.Test Step 2. CHECK THE ALTERNATOR.
Run the engine at a high idle for several minutes.
Measure the voltage output at the battery posts.Expected Result:The voltage is below 16 VDC.Results:
YES - Ensure that the diagnostic code is NOT present. The system is operating correctly. Stop.
NO - Proceed to test step3.Test Step 3. CHECK THE BATTERY VOLTAGE.
Turn the key start switch to the OFF position.
Measure the battery voltage at the battery posts.Expected Result:The voltage is below 16 VDC.Results:
YES - Ensure that the diagnostic code is NOT present. The system is operating correctly. Stop.
NO - FMI 00 is active when the engine is secured, and a battery charger is not connected to the system. This indicates that the shift lever transmission control has failed.Repair: It is unlikely that the shift lever transmission control has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the shift lever transmission control. See Testing and Adjusting, "Transmission Control (Shift Lever) - Replace". Stop.