PRE-RELEASE
Ground
| Ground |
| Power ground |
The following are grounded to grounding point G7:
| • |
control module pins 25, 47 and 62
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| • |
mass air flow sensor
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| • |
ignition discharge module.
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| 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
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| • |
Manifold absolute pressure sensor
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| • |
Charge air absolute pressure sensor
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| • |
Differential pressure sensor, tank
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| • |
Intake air temperature sensor
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| • |
Temperature sensor, engine coolant
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| • |
Oxygen sensor screens
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| • |
Pedal position sensors
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| • |
Throttle position sensor
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| 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.
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| • |
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.
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| • |
If the reference ground is missing, diagnostic trouble code P0134 will be generated.
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