PCM Ground

NOTE: The following information is intended to be used in conjunction with the electrical diagrams.

CIRCUIT OPERATION
The grounding point for circuit Z12 is the rear of the right cylinder head.

Circuit Z12 also supplies a ground for the PCM high current drivers and the heated oxygen sensor.

If the system loses ground for the Z12 circuits at the right rear of the cylinder head, the vehicle will not operate. Check the connection at the ganged ground circuit eyelet.