ALTERNATOR GP-CHARGING 5222896 - Caterpillar

Illustration 1 g01066105
Schematic for Magnetic Switches for the Start RelaysThis diagnostic code is recorded when the power train electronic control module (ECM) reads the voltage of the circuit for the start relays as above normal (short to +battery).Note: Ensure that the diagnostic code for the start relays is active. Before performing this procedure, refer to table 1 in order to determine the connector contact number and the wire number that corresponds to the failed circuit.
Table 1
Information for Starter Relays    
Fault    Connector Contact Number    Wire Number    
Starter Relays     J1-8 (1)     306-GN    
( 1 ) This is the connector contact number for the ECM.Note: All return lines for the start relays are joined. All return lines connect to contacts J1-7 and J2-3 (wire 975-WH) of the power train ECM.Note: The approximate coil resistance of each start relay is 15 to 65 Ohms.Possible causes of this diagnostic code are listed:
There is a harness fault.
A solenoid is shorted to the battery.System Response:The machine response is listed:
The shifting for the transmission is disabled.Test Step 1. CHECK THE SIGNAL CIRCUIT FOR THE START RELAYS FOR A SHORT TO THE +BATTERY.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the start relays.
Disconnect the machine harness connectors J1 and J2 from the power train ECM.
At machine harness connector J1 and J2, measure the resistance from the signal contact for the start relays to all possible sources of +battery. Refer to table 1. The possible sources of positive voltage are connector contacts J1-1, J1-4, J1-6, J1-8, J1-10, J1-11, J1-12, J1-17, J1-18, J1-40, J2-1, J2-2, J2-7, J2-8, J2-13, J2-19 and J2-37.Expected Result:Each resistance should be greater than 5000 ohms.Results:
YES - The machine harness is correct. Proceed to Test Step 2.
NO - There is a short in the machine harness. The short is between the signal contact for the start relays and the circuit with a measurement of low resistance. Refer to the previous table.Repair: Repair the machine harness or replace the machine harness. Stop.Test Step 2. CHECK IF THE FAULT IS STILL PRESENT.
Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect key and the key start switch to the ON position.
Enter Service Mode of the VIMS. Clear all inactive faults.
Attempt to operate the machine in all gears. All gears may not be available.
Stop the machine and engage the parking brake.
Check if the diagnostic code for the start relays is active.Expected Result:The diagnostic code for the start relays is active.Results:
YES - The fault has not been corrected. It is unlikely that the power train ECM is faulty. Perform the previous steps again.Repair: If the cause of the fault is not found, replace the power train ECM. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for more information on replacing the power train ECM. Stop.
NO - The fault is NOT active. The fault does not exist at this time. The initial fault was probably caused by