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Re: Restoring Rusty
Grounds Demystified
having liberated all of my ground wires from my 2001 GMC Sierra 4.8L 4L60E engine wiring harness, I learned that only the following four components use what I call external/dedicated wire grounds:
1. Coils
2. Oxygen Sensors (some don't use a separate ground wire, but ground by housing contacting the down pipe)
3. MAF
4. MLPS (Transmission Neutral Switch / Range Sensor)
In addition the PCM itself consumes four grounds:
1. Blue Connector PIN # 1
2. Blue Connector PIN # 40
3. Red Connector PIN # 1
4. Red Connector PIN # 40
To roll our own Fuse/Relay block we borrow one of the extra grounds from something that got deleted, and we do the same for the little OBDII port, it too needs a dedicated ground
The following sensors get their grounds from the PCM I call these internal grounds:
1. Blue Connector Crank Shaft Position Sensor PIN #21
2. Blue Connector PRND Trans PIN #32
3. Blue Connector Transmission #41
4. Blue Connector Throttle Position Sensor PIN #54
5. Blue Connector Camshaft Position Sensor PIN #61
6. Blue Connector Coolant Temp Sensor PIN #63
7. Red Connector IAT Sensor PIN #57
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