key in run position: radiator fan; fuel pump, several relays all cycle, won't start
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This is a discussion on key in run position: radiator fan; fuel pump, several relays all cycle, won't start within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; 2004 WRX STI – This car is brand new to me, the mod that I can see is an aftermarket ...

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    Question key in run position: radiator fan; fuel pump, several relays all cycle, won't start

    2004 WRX STI – This car is brand new to me, the mod that I can see is an aftermarket intercooler in front of the radiator. It idled fine, and did not run properly under acceleration. It had a code for a faulty tumble generator sensor and/or motor. I replaced the tumble generator motor with one from the dealer. I also replaced the tumble generator position sensor with one from a used manifold on what I think is a different model car, it may not be an STI (the donor manifold had smaller fuel injectors). Now the engine turns over, but it won’t start. While the key is in the run position: the radiator fan; fuel pump, and several relays all cycle on/off, on/off, etc. The check engine light blinks and several other lights on the dash are on. It still has a code for an O2 sensor and some undefined codes.

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    Registered User joesubaru7's Avatar
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    Check that the green test mode connectors aren't connected under the dash. You said it ran prior though, so just a thought.
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    Thanks, I'll check that out.

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    Thanks, the innocuous looking green test mode connector was plugged in, and since the fuel pump had been cycling so rapidly the spark plugs were soaked with fuel which prevented the car from starting. (There were two of these cars that came into the shop from an auction with the same problem, the other one started, but ran with the test mode connector plugged in, unbeknown to the two other mechanics who spent over two days trying to figure it out.) Thanks for making me the hero of the week at work!

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    Registered User joesubaru7's Avatar
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    ^Agreed
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    ^Agreed
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    Quote Originally Posted by joesubaru7 View Post
    Check that the green test mode connectors aren't connected under the dash. You said it ran prior though, so just a thought.
    More free beer if you guys can help me out!!

    I am having the same exact issues as Justthere. I have had my 05 STi down for the winter while doing a bunch of work on it. I am ready to start her back up. I started by priming the turbo, pulling the #11 fuse and turning her over (no issues, no crazy rad fans, fuel pump etc). After putting the fuse back in and turning the ignition to the on position I get all the same things going on that Justthere has.

    Josesubaru, you say to make sure the green test mode plug is unplugged. B/c currently it is plugged in on mine and I haven't never touched it before. Does it just need to be unplugged for the initial start up or should it stay unplugged for ever? If it does need to stay unplugged from here on out, why is that?

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    Registered User jgardiner's Avatar
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    The green test connector needs to be unplugged unless you are running a self-diagnostic on the ECU. If you want the car to run it must stay unplugged.

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    Ok, I will unplug it when I get home. Whats weird is before I took her off the road the test connector was connected and I never had these issues. I have never touched the connector before, it always been connected.

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