993 non start

Author
Discussion

ras62

1,090 posts

156 months

Sunday 14th April
quotequote all

Crank sensor failure will only stop the fuel pump working, the car will still get a spark. The Control Unit is powered by the DME relay when turning on the ignition (connection 37 at the DME).
When cranking the engine the Control Unit receives a signal from the crank sensor, it then pulls in the second relay inside the DME that starts the fuel pump.