Quote:
Originally Posted by johnny485
Now, the engine fires on the first turn but does not sustain so a look in the Fuel pump dept showed 12V to be there but continuous drive.
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+12v is supplied by the ECCS/EFI/Management Relay to the pump + connector when the key goes to stage 2. It is a constant feed.
The control is done one the negative/ground side - which runs back through the ECU which regulates the voltage that is allowed to return through the fuel pump.
If you can download the service manual (available from club-s12), then look at page EC-33 for voltage levels and how to measure. Page EC-12 has a full diagram of the ECCS wiring which helps show how the pump is wired, and EC-66 shows test procedure and ECU pin for pump return.
This has caused me many headaches on my car!
Good to hear you are starting to get it working right again!