Ground Point G7

Ground Point G7:

Power ground, due to connection resistance and current consumption variations, has a different electrical potential to signal ground. Therefore, they must be regarded as two separate components.

Power ground:
The ECM receives its power ground (66 as reference ground on TOS cars) via pins 24 and 25.

Signal ground:
The ECM receives its signal ground via pins 47 (reference ground) and 67 (on cars without TOS also via pin 66).