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Fuel pump relay problems
Posted 05 February 2013 - 06:56 AM
I have not pulled the codes yet I am waiting for a code reader I ordered online. CEL is off.
If the ECU is bad anyone know what units are compatable with this car? The ECU in it is this one pictured.
Posted 05 February 2013 - 08:27 AM
And you can't hear the pump run for a few seconds when you cycle the key to ON?
is there a pressure switch somewhere that could be bad, trying to keep the pump shut off? maybe even a rodent chewed wire ?
Edited by 1 Lucky Texan, 05 February 2013 - 08:30 AM.
Posted 05 February 2013 - 11:08 AM
Posted 05 February 2013 - 12:30 PM
Edited by Cougar, 05 February 2013 - 12:39 PM.
Posted 06 February 2013 - 06:48 AM
Yea this is what has me confused also. I jumped it with a bent wire and I think this is where it was touching through the back of the connector. Also the pump does not run for the 3 seconds when not jumped. I will try what you suggest this weekend and see what I come up with. Could a main relay or a bad ignitor or or any othe sensors cause a relay not to work. I figure not because it does run fine with the relay jumped to ground from where I have it jumped. It is hard to see in that cramped space. Would it be easier to get to the relays through the instrument panel by removing it. Also my digram shows the violet wire going to the MPFI. I am thinking this stands for multi port fuel injection? What is the MPFI? Thanks!
Edited by Mark j, 06 February 2013 - 06:56 AM.
Posted 06 February 2013 - 10:49 AM
Posted 06 February 2013 - 11:49 AM
Since the fuel pump doesn't even turn on for a few seconds when the key is turned ON it means something is either wrong with the ECU or the pump circuit. You have proved somehow, that the pump circuit does work manually so unless a power supply line to the ECU has a problem I would think the problem is with the ECU. It is pretty easy to replace it so it might save a lot of hunting by just installing another one and see what happens.
When the engine is running, the ECU checks for ignition pulses to keep the fuel pump running. If it doesn't see any pulses it will shut the circuit down. The circuit should still work though when the key is turned ON and the engine isn't cranking, in order to prime the fuel system.
Edited by Cougar, 06 February 2013 - 11:52 AM.
Posted 06 February 2013 - 07:29 PM
What you need for your ECU? Looks like you are in Canada, does it make any difference in the software on a ECU do to any fuel differences in Canada?
Have that exact ecu here in my hands if you need it came out of a 97 outback was hit in front but #s match 7x 22611 AD001 JA18000DJ7
Posted 07 February 2013 - 10:56 AM
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