Operation - Pcm Ground

Ground is provided through multiple pins of the PCM connector. There five different ground pins. There are engine power grounds and trans power grounds.

The power grounds are used to control the ground side of any relay, solenoid, ignition coil or injector.

The NGC case is shielded to prevent RFI and EMI. The PCM case is grounded and must be firmly attached to a good, clean body ground.

Internally all grounds are connected together. For EMI and RFI protection the case is also grounded separately from the ground pins.