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.