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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 control module pins 22 and 70. The two supplies are internally coupled together in the throttle body.



Crankshaft position sensor and its screen

Manifold absolute pressure sensor

Charge air absolute pressure sensor

Differential pressure sensor, tank

Intake air temperature sensor

Temperature sensor, engine coolant

Oxygen sensor screens

Pedal position sensors

Throttle position sensor


Reference ground

Oxygen sensors 1 and 2 are 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 throttle will go into limp-home mode. As the two sensor ground outputs are coupled together internally in the throttle body, there will be no symptoms if a break should occur in only one of them.

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