PULLER A CYL 7F1857 - Caterpillar

Illustration 1 g02274374
24 VDC power connections for the Chassis ECMThis diagnostic code is recorded when the system voltage is greater than 32.5 DCV. The solenoids may be damaged if the voltage remains high for an extended period. The possible causes of this diagnostic code are listed below:
A charging system component has failed.
The harness wiring has failed.
The Chassis ECM has failed. A failure of the ECM is unlikely. Test Step 1. CHECK THE CHARGING SYSTEM.
Start the engine.
Observe the status of the diagnostic code indicator. Expected Result:The diagnostic code is active.Results:
YES - The diagnostic code is active.Repair: The charging system is charging at an excessive voltage. Check the charging system. See System Operation, SENR2947, "Starting and Charging System".STOP
NO - The diagnostic code is not active. Repair: There is no problem at this time. Watch for a recurrence.STOPTest Step 2. CHECK THE BATTERY VOLTAGE.
The engine is stopped. At the battery, measure the voltage. Expected Result:The voltage is less than 32.5 VDC.Results:
YES - The voltage is less than 32.5 VDC.Repair: A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - The voltage is not less than 32.5 VDC.Repair: The charging system is charging at an excessive voltage. Check the charging system. See System Operation, SENR2947, "Starting and Charging System".STOP