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If you did the test exactly as I mentioned, it eliminates only the ECU from the fuel pump circuit. You said when you did the test, the pump always primed, but when you reconnected everything and used the key, the problem returned, thereby pointing to an ECU issue. Repeat the tests to see if you get the same or different results.
Also I just went outside right now and it took 4 minutes for the fuel pump to turn on but I turned my heater on low this time which didn't seem to help much considering the car wasn't on to provide actual heat.
Do the tests multiple times. If the pump runs every time you ground A7, but the pump intermittently fails when you turn the key with everything plugged in, the ECU is likely the problem.
There are also a couple of electrical tests that can be done to verify.
Also I just went outside right now and it took 4 minutes for the fuel pump to turn on but I turned my heater on low this time which didn't seem to help much considering the car wasn't on to provide actual heat.
I put ground to A7 and every time it works I turn the key on it turns on I turn it off the pump turns off. Works like a charm every time when i supply the ground but does not work when I plug in the connector... Even though this is a new ECU.
We stuck a thin wire into the pin A7 supplying ground to it manually with everything plugged in and the fuel pump ran but the CEL did not turn off and the car wouldn't start even though the fuel pump was on. We then took the wire out and left the key in for no purpose and a minute or so later the relay clicked Fuel pump ran CEL turned off and they car started right up.
We then took the wire out and left the key in for no purpose and a minute or so later the relay clicked Fuel pump ran CEL turned off and they car started right up.
No I turned the car off let it sit for a few minutes turned the key to ignition and I had to wait about 3 minutes for the pump to turn on and for the CEL to turn off.
05-14-2015, 09:06 PM
Re: Intermittent Electrical Issue 94 DX
