WIRING GP- 3C8371 - Caterpillar

Illustration 1 g01953480
Schematic diagram for sensor supply 1
Illustration 2 g01324921
Schematic diagram for sensor supply 2
Test Step 1. Identify the Diagnostic Code
Establish communication between Cat ET and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Identify the diagnostic code. Results:
Logged -3 code or -4 code - Proceed to Test Step 2.
Logged -10 code. - Repair: Repair the open circuit between the P2 connector and the appropriate sensor connector. Verify that the problem is resolved.STOP
Active 3509-3 code or 3509-4 code - There is a problem that relates to sensor supply 1. Proceed to Test Step 3.
Active 3510-3 code or 3510-4 code - There is a problem that relates to sensor supply 2. Proceed to Test Step 5.Test Step 2. Wiggle the Wiring and Look for ProblemsCarefully following this procedure is a good way to identify the root cause of an intermittent problem.
Verify that the engine is OFF and that the keyswitch is ON.
Configure Cat ET to display the active diagnostic codes. Note: Problems with the circuit must exist for at least one second before a diagnostic code for the 5 volt supply becomes active.
Slowly wiggle the wiring and the connectors between the appropriate ECM connector and each sensor. Pay particular attention to the wiring near each connector. Be sure to wiggle all of the wiring between the ECM connector and each sensor. As you wiggle the wiring, observe the wiring and the connectors. Look for these problems:
Loose connectors or damaged connectors
Moisture on the connectors or the wiring
Damage that is caused by excessive heat
Damage that is caused by chafing
Improper routing of wiring
Damaged insulationAs you wiggle the wiring, monitor the active diagnostic screen on Cat ET. Look for the code to become active.Expected Result:A "5 Volt Supply" diagnostic code became active when the wiring was wiggled.Results:
Yes - A "5 Volt Supply" diagnostic code became active when the wiring was wiggled.Repair: Repair the wiring, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOP
No - A "5 Volt Supply" diagnostic code did not become active when the wiring was wiggled.Repair: There may be a problem inside a connector. Perform the following procedure:
Disconnect the connectors for the sensors that relate to the diagnostic code. Carefully inspect the terminals in each connector for proper installation. Each terminal must be clean and dry. Clean the terminals, if necessary. Pull on each wire at the harness connector in order to verify that the crimp is OK and that the terminal is installed correctly. Repair any problems.