Ground

Ground

Power ground

Grounding point G7 is used to ground the following:

•	control module pins 25, 47 and 62

•	mass air flow sensor

•	ignition discharge module.

Sensor ground

The following sensors are grounded via pin 22 of the control module:

•	The crankshaft position sensor and its screening

•	Manifold absolute pressure sensor

•	Intake air temperature sensor

•	Coolant temperature sensor

•	The oxygen sensor's screening

•	Pedal position sensors

•	Throttle position sensors

The following sensors are grounded via pin 70 of the control module:

•	Charge air absolute pressure sensor

•	Pedal position sensors

•	Throttle position sensors Note Control module pins 22 and 70 are linked together in the throttle body.

Reference ground

The oxygen sensor is grounded via control module pin 58.

Diagnostics

•	If no power ground is present, the engine will not start and the system cannot be contacted by the diagnostic tool.

•	If no sensor ground is present, the engine will not start and the functions supplied with current will generate diagnostic trouble codes.

•	If no reference ground is present, diagnostic trouble code P0134 will be generated.