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Old 01-06-2012, 10:17 PM   #1
TradersBASE
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Default Clicking relay, no OBD data, flashing CEL

Hey guys. I'm thinking my ECU went bad but would like to get input from the pros here before I order any part/parts.

I have a 99 Suby 2.5rs coupe with 200+k miles on it. A relay (think it was a 056700-5260) clicks and makes lots of noise. It doesn't seem to be a bad relay because I swapped with another relay/conector then the other relay began clicking where the original suspect one didn't click anymore. So it seems to be the green relay harness, or something related to it. Green is fuel relay right? I'm talking the 3 relays under the dash on the drivers side. White & green connector as well as a brownish relay in between them.

Other symptoms are no OBD data or communication to my basic OBD tool. And the CEL flashes, which I think usually is a misfire. But the kicker is the car won't even try to turn over, no noise...no nothing. So it surely isn't misfiring. Oh, and my fuel gauge shows 0 fuel though I know there is gas in there.

Any ideas? Thanks a ton.
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Last edited by TradersBASE; 01-06-2012 at 11:20 PM. Reason: Added some info
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Old 01-06-2012, 10:58 PM   #2
yarrgh
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under the dash are 2 green connectors. they should normally be disconnected. they are diagnostic plugs. Did you connect them?
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Old 01-06-2012, 11:02 PM   #3
fod1
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If memory serves me right, try looking at the passenger side A pillar area and see if there are two relays there. I think there is the main relay and the fuel pump relay there. Try swapping these for good known ones and see how you get on.Good luck
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Old 01-06-2012, 11:03 PM   #4
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Quote:
Originally Posted by yarrgh View Post
under the dash are 2 green connectors. they should normally be disconnected. they are diagnostic plugs. Did you connect them?
The car would start with these connected, the CEL would flash but the car would run.
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Old 01-06-2012, 11:14 PM   #5
TradersBASE
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Thanks for the replies. The relay harness that is causing the clicking is the green one under the dash on the drivers side. There is a white and green harness and a brownish colored relay in the middle.

I didn't connect any wires under there and the car was working fine for the past year with no repairs needed. This happened the day we had 5 degree weather here if that gives you guys any further ideas.

The car won't even try to crank or turn over. Nothing. It's most likely not the battery I'm guessing because the headlights are bright, wipers aren't slow and it's a newer battery that has been working fine.
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Old 01-07-2012, 08:04 PM   #6
mechatricity
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Quote:
Originally Posted by TradersBASE
Thanks for the replies. The relay harness that is causing the clicking is the green one under the dash on the drivers side. There is a white and green harness and a brownish colored relay in the middle.

I didn't connect any wires under there and the car was working fine for the past year with no repairs needed. This happened the day we had 5 degree weather here if that gives you guys any further ideas.

The car won't even try to crank or turn over. Nothing. It's most likely not the battery I'm guessing because the headlights are bright, wipers aren't slow and it's a newer battery that has been working fine.
Isn't that the blinker relay? Or is that one black....I can't remember.

Do you hear the fuel pump prime?
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Old 01-07-2012, 08:16 PM   #7
TradersBASE
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I don't hear the fuel pump prime. Also here are todays findings...what an adventure this is becoming.

My friend that was "helping" look at things connected the diagnostic whips which explains the flashing CEL. That's resolved.

I tried a different battery because 3 people insisted that was it...it wasn't. I suspected that was the case because if it was low cranking amps the jump start should have worked from the little I do know.

I think the most telling hints for a pro on electrical may be the lack of fuel gauge signal and lack of OBD signal through the port. I know the fuel gauge is resistance based so it should read no matter what. Clearly it's electrical, but is it the ECU I keep wondering. My one friend thought ignition but my other friend (actual mechanic) said the ignition is controlled by the ECU and not likely.

Would the ECU cause no fuel gauge signal?

Thanks again guys.
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Old 01-09-2012, 03:46 PM   #8
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Tried another ECU and no improvement. Well, the relay seems to have stopped buzzing but that could be a fluke. Fuel pump does prime, I don't think it was prior but it was so cold out and I was frazzled so I could be wrong.

The 2 key issues now are...
No OBD data when ignition is turned to on
No fuel gauge data

Fuses all look good so somewhere there's a short. Any suggestions on where might begin to look. What a rats nest these cars are. You guys that wire stuff up blow my mind.

Thanks
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Old 01-09-2012, 08:07 PM   #9
bugeyetex
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Try supplying the power to the obd connector with the scanner hooked up. I had to do this just the other day in a tahoe. Take your test light, cram it in the back of your obd connector where the power supply wire is, and connect 12v to the end of your test light that's in the connector. It worked for me...
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Old 01-10-2012, 01:12 AM   #10
TradersBASE
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Quote:
Originally Posted by bugeyetex View Post
Try supplying the power to the obd connector with the scanner hooked up. I had to do this just the other day in a tahoe. Take your test light, cram it in the back of your obd connector where the power supply wire is, and connect 12v to the end of your test light that's in the connector. It worked for me...
So you're thinking the ignition switch isn't delivering power to the ECU? Could be. Running a few tests hopefully tomorrow and then next step will be to rip alarm out.

Thanks for the suggestion
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Old 01-10-2012, 05:53 PM   #11
bugeyetex
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Quote:
Originally Posted by TradersBASE View Post
So you're thinking the ignition switch isn't delivering power to the ECU? Could be. Running a few tests hopefully tomorrow and then next step will be to rip alarm out.

Thanks for the suggestion
not power to the ecu, but power to your scan tool. If your scan tool doesn't get voltage from the obd connector, it wont communicate or wont even turn on.
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Old 01-10-2012, 07:18 PM   #12
TradersBASE
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I gotcha. Interesting. Thanks for the idea to check out.
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Old 01-11-2012, 02:28 PM   #13
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Today I pulled the fuse for the alarm effectively killing it. I jumped the starter line back together and exact same result. No dice on the alarm being the culprit. The quest continues.

Thanks again for the suggestions guys. I'm determined to get this solved.
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Old 01-11-2012, 11:43 PM   #14
TradersBASE
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Insufficient ground. Everything was reading grounded on the meter but must have had corrosion in the battery cable itself. So point a and b were grounded but not all the way through. We found this out AFTER pulling the starter and taking it to be tested. Chassis ground was good but of course not sufficient to handle the full load.

Thanks for the suggestions and help.
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