Control module grounding points
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Control module grounding points
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The control module is connected to power ground via pins 2, 14 and
24. The control module's main ground is applied to pin 14.
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Lambda reference ground, G7L
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The control module's reference ground for Lambda control is applied
to pin 10.
Pin 19 of the control module is connected to signal ground G7S. Also
connected to signal ground are the camshaft and crankshaft position
sensors, and the screening on the oxygen sensors signal leads.
The control module grounds pin 30, which is the grounding point for
the following sensors:
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throttle position sensor
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coolant temperature and intake air sensors
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Checking of grounding points
The difference in potential between the main ground on pin 14 and
the sensor ground on pin 30 should be less than about 0.1 V.
A voltmeter can be used to check the control module's main ground by
measuring the voltage across pin 14 and the negative battery terminal.
A reading of less than about 0.1 V should be obtained.
Other grounding points can be checked in the same manner, but the
voltage should be measured across pin 14 and pins 2, 24, 10 and 19. A
reading of less than about 0.1 V should be obtained here also.
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Important
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The three ground connections on the ignition coil bracket must always
be kept separate.
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