[Lorenfb]

The Porsche CIS unit has two relays, a small 1X1 used to power
the CIS unit and the freq. valve. The larger 1X3X3 is the fuel
enrichment relay. The sensor plate switch energizes the small
relay just like the fuel pump relay once the engine runs.

Get a good wiring diagram.

Good luck
Loren
Systemc.com