Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

•	Identify how to disable high voltage.

•	Identify how to test for the presence of high voltage.

•	Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.



1. Disable the high voltage system. Refer to High Voltage Disabling.
2. Remove the intake manifold cover. Refer to Upper Intake Manifold Sight Shield Replacement.
3. Remove the generator control module 3 phase cable clip nut (1).
4. Remove the generator control module 3 phase cable clip from the engine bracket (2).
5. Reposition the generator control module 3 phase cables out of the way.



6. Remove the connector position assurance (CPA) retainer (2).
7. Disconnect the engine harness electrical connector (1) from the ignition coil wire harness.
8. Remove the engine wiring harness (electronic throttle control branch) clip (6) from the ignition coil bracket stud.
9. Reposition the engine wiring harness (electronic throttle control branch) as necessary.



10. Remove the heater inlet hose (2) from the heater hose bracket (3).



11. Remove the surge tank outlet hose (2) from the heater hose bracket (3).



12. Remove the heater hose bracket nut (1) and bracket (2).



13. Remove the spark plug wires (724) from the ignition coils.

•	Twist each plug wire 1/2 turn.

•	Pull only on the boot in order to remove the wire from the ignition coil.

14. Remove the ignition coil bracket studs (720).
15. Remove the ignition coil bracket (719).



16. Remove the positive crankcase ventilation (PCV) tube (1) from the valve rocker cover (2).



17. Loosen the valve rocker arm cover bolts.
18. Remove the valve rocker arm cover.



19. Remove and discard the old gasket (1).



20. Remove the oil fill cap (424) from the oil fill tube (423), if necessary.
21. Remove and discard the oil fill tube, if necessary.

Note: 

1. Lubricate the O-ring seal (422) of the NEW oil fill tube with clean engine oil.
2. Insert the NEW oil fill tube (423) into the rocker arm cover.

Rotate the tube clockwise until locked in the proper position.

3. Install the oil fill cap (424) into the tube.

Rotate the cap clockwise until locked in the proper position.




4. Install a NEW rocker cover gasket (1) into the valve rocker arm cover lip.



5. Install the valve rocker arm cover.

Caution: Refer to Fastener Caution in the Preface section.

6. Tighten the rocker arm cover bolts.

Tighten
Tighten the bolts to 12 N·m (106 lb in).




7. Install the PCV tube (1) to the valve rocker cover (2).



8. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the ignition coil bracket studs.
9. Position the ignition coil bracket (719) onto the rocker cover.
10. Install the ignition coil bracket studs (720).

Tighten
Tighten the studs to 12 N·m (106 lb in).

11. Install the spark plug wires (724) to the ignition coils.



12. Install the heater hose bracket (2) and nut (1).

Tighten
Tighten the nut to 9 N·m (80 lb in).




13. Install the surge tank outlet hose (2) to the heater hose bracket (3).



14. Install the heater inlet hose (2) to the heater hose bracket (3).



15. Position the generator battery cable as necessary.
16. Install the generator battery cable clip (1) to the ignition coil bracket stud.



17. Position the engine wiring harness (electronic throttle control branch) as necessary.
18. Install the engine wiring harness (electronic throttle control branch) clip to the ignition coil bracket stud.
19. Connect the engine harness electrical connector (1) to the ignition coil wire harness.
20. Install the CPA retainer (2).



21. Position the generator control module 3 phase cables to the bracket channel.
22. Install the generator control module 3 phase cable clip to the tab (3) on the engine bracket (2).
23. Install the generator control module 3 phase cable clip nut (1).

Tighten
Tighten the nut to 9 N·m (80 lb in).

24. Enable the high voltage system. Refer to High Voltage Enabling.
25. Install the intake manifold cover. Refer to Upper Intake Manifold Sight Shield Replacement.