Principle of operation, control modulegrounding points
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Principle of operation, 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
sensor's signal lead.
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 sensor
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Checking of grounding points
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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.
