Its been a while since I posted about it but the bottom line is I'm still getting the SES light (54) occasionally at start up. I've played with the relay connection and it is alright. Am I possibly looking at a bad ground sowewhere? Aren't electrical problems fun!! It has also been suggested to me once (by a dealer) that the ecm is bad. What a surprise they would want to sell me a $210 ecm first. Anyway if anyone's got anymore insight (Vader I know you followed my thread from a while ago) please feel free to jump in!! Thanks

Bob


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350 TPI, 700R4(rebuilt), K&N's, MSD 6AL, Headers, Flowmaster, 160* stat, airfoil, MAF screens cut out. 13.88 @ 101.18 mph

 

Time to troubleshoot.

Might as well test the ECM first. Unplug the relay and probe the contact hooked to the green wire (Pin C I think) with a test light. Turn the key to the "on" position. The test light should come on for 2 seconds then go out. If it does, the ECM is functioning. Next, hook the relay back up, and probe Pins A and E. One should be hot all the time, and the other should only be hot for the 2 seconds after you turn it "on". Don't forget that if you turn it "on" ten seconds or sooner since turning it "off", it doesn't re-energize the fuel pump. This test doesn't work with the car running because the fuel pump is dual fed, and the voltage will backfeed this circuit even if the realy isn't working. Let me know what happens after doing this testing.

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Gee, that's funny. My ses light appeared to be working. It would come on and when I'd start the engine it would turn off. When the mechanic checked my codes though, it was thowing a code 54. I don't know why the light never showed though. Turned out to be my IAC valve. Not anything to do with the fuel pump circuit relay crap or whatever it is. Good luck with the problem.

 

Thanks, but I'm pretty sure a 54 is fuel pump circuit related. I didn't get a chance to do that test yet. That relay is really clicking like crazy while the car is running. Why does it sound like that? Hopefully I'll have some time tomorrow to look at it.

 

If the relay is clicking, it means that it's turning on and off, which it shouldn't do. So, either the relay is FUBAR, or the signal feeding the relay (from the ECM) is FUBAR.

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Jim, I have changed the relay already so I'll assume it is good. Could a bad ground cause the on/off situation or more likely an ecm problem? The light only comes on sometimes when started but the clicking occurs randomly while I'm driving.

 

It could be a ground, but I'd say it's not likely. The ground is through the fuel pump, so you'll have to do a voltage check at the plug near the tank. First, I would probe the green wire on the relay harness with the car running and see how it behaves in relation to the clicking relay.

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The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

Well I played around with the relay today. Didn't get any reading from the green wire at all. When I checked pin A I got a reading initially but couldn't anytime after that. Pin E didn't show anything. The relay clicked a few times here and there. Just for the heck of it I started it without the relay connected and it fired. What now? New ecm?

 

By the way the car looks good Jim!

 

Anyone else??

 

Thanks! I hate to say it, but if the green wire doesn't have any signal, it sounds like the ECM. The car will run with the relay disconnected because the fuel pump is dual-fed. That's why you'll also find voltage at the output pin of the relay when the car is running. It is back-fed from the oil pressure circuit.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah