PULLEY 3358270 - Caterpillar

This diagnostic code is recorded when the system voltage is below 18 VDC.Note: The diagnostic code will clear when the system voltage exceeds 18.5 VDC.The possible causes of this diagnostic code are listed below:
The fuse for the power train is open.
The wiring in the machine harness has failed.
A charging system component has failed.
The ECM has failed. An ECM failure is unlikely. Test Step 1. Check the battery voltage with the engine running
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 18 VDC.Results:
YES - Battery voltage is greater than 18 VDC. Battery voltage is correct. Proceed to Test Step 2.
NO - Battery voltage is less than 18 VDC.Repair: The charging system is not correct. Check the charging system. Refer to 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 a digital multimeter.
The + battery power connects to the ECM at four contacts on the J1 connector. Refer to the complete electrical schematic. At the J1 machine harness connector for the ECM, insert the multimeter probes into the contacts for wire 140-RD(Red) and wire (202-BK(Black)). Measure the voltage. Expected Result:Voltage should be greater than 18 VDC.Results:
YES - Voltage is greater than 18 VDC. Battery voltage is correct. Proceed to Test Step 3.
NO - Voltage is less than 18 VDC.Repair: The machine harness is not correct. Refer to the Electrical System Schematic, KENR8916. Ensure that the 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
Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation. Damage is caused by excessive heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all of the harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened.
Turn the disconnect switch and the key start switch to the ON position.
Determine if the CID 0168 - FMI 04 diagnostic code is active. Expected Result:The CID 0168 - FMI 04 diagnostic code is not active.Results:
YES - The CID 0168 - FMI 04 diagnostic code is not active. The problem does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection that was disconnected and reconnected. Resume normal machine operation.STOP
NO - The CID 0168 - FMI 04 diagnostic code is active.Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, the