INJECTOR GP- 7C9579 - Caterpillar

Test Step 1. CHECK THE ENABLE CIRCUIT FOR A SHORT CIRCUIT
Turn the key start switch and the disconnect switch to the OFF position.
At the EFR, disconnect the 14 contact control circuit harness connector from the module connector. Visually inspect each of the connector contacts for damage or contamination. Verify that the contacts are clean, secured in the connector and in good condition.
At the Drivetrain ECM, disconnect the J1 and the J2 harness connectors. Visually inspect each of the connector contacts for damage or contamination. Verify that the contacts are clean, secured in the connector and in good condition.
At the J2 machine harness connector for the Drivetrain ECM, measure the resistance between the enable circuit contact J1-12 (wire E865) and each individual connector contact that is used in the J1 harness connector and the J2 harness connector for the Drivetrain ECM. Expected Result:Each individual resistance measurement between the enable circuit and each of the other contacts on the ECM connectors is greater than 4000 ohms.Results:
OK - Each individual resistance measurement between the enable circuit and the other circuits is greater than 4000 ohms. The enable circuit resistance checks do not indicate a short circuit to another circuit in the machine harness. Proceed to Test Step 2.
NOT OK - One or more of the resistance measurements is less than 4000 ohms. There is a short circuit in the machine harness.Repair: If the short circuit is between the enable circuit wire E865 and another harness circuit, refer to the complete machine Electrical System Schematic. Check all of the connectors that are in the circuit. Ensure that all connections are clean, secure, and in good condition.Check each segment of the enable circuit in order to determine where the two circuits are shorted.For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace machine harness.STOPTest Step 2. CHECK THE OPERATION OF THE ECMNote: This check is intended to determine is the ECM is responding correctly to a change in the circuit. The battery disconnect switch and the key start switch remain in the OFF position.
Reconnect the 14 contact control circuit harness connector to the EFR module.
At the machine harness connector J1 for the Drivetrain ECM, use a 151-6320 Removal Tool to remove the enable circuit wire and socket at contact J1-12 (wire E865) from the harness connector. Reconnect the J2 harness connector to the Drivetrain ECM and reconnect the J1 harness connector to the Drivetrain ECM.
Turn the key start switch and the disconnect switch to the ON position. Do not start the Engine.
Observe the status of the MID 081, CID 3425 FMI 03 diagnostic code. Expected Result:The MID 081, CID 3425 FMI 03 diagnostic code is no longer active. An MID 081, CID 3425 FMI 05 diagnostic code for low current becomes active when the enable circuit is at J1-12 is removed.Results:
YES - An MID 081, CID 3425 FMI 05 diagnostic code has been activated