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.