Ground

Ground

Power ground

The following are grounded to grounding point G7:

•	control module pins 25, 47 and 62

•	mass air flow sensor

•	ignition discharge module.

Sensor ground

The following sensors are grounded from pin 22:

•	Crankshaft position sensor and its screen

•	Manifold absolute pressure sensor

•	Intake air temperature sensor

•	Engine coolant temperature sensor

•	Oxygen sensor screen

•	Pedal position sensors

•	Throttle position sensor

The following sensors are grounded from pin 70:

•	Charge air absolute pressure sensor

•	Pedal position sensors

•	Throttle position sensor Note Control module pins 22 and 70 are connected in the throttle body.

Reference ground

The oxygen sensor is grounded from control module pin 58.

Diagnostics

•	The engine will not start if the power ground is missing and the diagnostic tool will not be able to make contact with the system.

•	The engine will not start if the sensor ground is missing and the functions being supplied will generate diagnostic trouble codes.

•	If the reference ground is missing, diagnostic trouble code P0134 will be generated.