Ground
Ground |
Power ground |
Grounding point G7 is used to ground the following:
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control module pins 25 and 47
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• |
mass air flow sensor
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• |
ignition discharge modules.
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Sensor ground |
The following sensors are grounded via pin 22 of the control module:
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The crankshaft position sensor and its screening
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Manifold absolute pressure sensor
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Intake air temperature sensor
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Coolant temperature sensor
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The oxygen sensor's screening
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Pedal position sensors
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Throttle position sensors
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The following sensors are grounded via pin 70 of the control module:
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Charge air absolute pressure sensor
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• |
Pedal position sensors
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Throttle position sensors
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Reference ground |
The oxygen sensor is grounded via control module pin 58.
Diagnostics |
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If no power ground is present, the engine will not start and the system cannot be contacted by the diagnostic tool.
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• |
If the sensor ground is absent, the engine will not start and the functions being supplied will generate diagnostic trouble codes. Since the two sensor ground outputs are coupled together internally in the throttle body, no symptoms will appear if an open circuit occurs in only
one
of them.
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• |
If no reference ground is present, diagnostic trouble code P0134 will be generated.
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