05 Cobalt Current Draw (fixed) - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-19-2011, 10:07 AM   #21
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A 3a draw has me thinking you have a bad relay. You mention you hear it clicking. Unplug that relay and test the amp draw again. Should be nearly zero then. Replace the relay with a new one and retest. If the problem goes away, your done, if not, start testing that circuit. Don't bother testing the relay, I've seen a few problems like this and even after testing the relay, could find no problem with it to explain why it'* doing that. They just wig out some times.
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Old 08-19-2011, 04:12 PM   #22
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I switched the relay right off the bat. The relay is not the problem.

*Fan blows nonstop while relay goes crazy, car will not carnk
*pull relay and car will crank, but no fuel pressure
*ECU not the problem
*relay not the problem
*car not storing codes
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Old 08-19-2011, 04:16 PM   #23
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Trace the circuit, something is shorting out. Start by pulling the panel the relay is on. I've seen more then a few get wet and corrode on the bottom. Check any place a wire may have been pinched or hit. But it sounds to me like you have a dead short. Perhaps unplug the fan you said is running and see if that helps.
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Old 08-19-2011, 07:09 PM   #24
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That'* one of the things that'* got me confused - If I pull the fan, the relay stops buzzing, but the fan isn't connected to the control of the relay, so how can the fan make the relay buzz?

I pulled the panel and I see no signs of corrosion or damage, but I can't really everything becuase it'* covered with plastic.
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Old 08-19-2011, 07:32 PM   #25
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It'* possible two wires are shorting together. Test both circuits.
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Old 08-19-2011, 08:35 PM   #26
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I wish I could open this fuse panel up and see the circuit board. That'* really the only place the wires are close.

I wish wiring diagrams were more available online without paying for AllData.
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Old 08-25-2011, 12:59 PM   #27
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I changed the fuse panel and the fan relay problem is fixed.

The draw is now 0.16A and seems to be coming from the BCM.

I still have no fuel pressure. The fuel pump fuse is getting no voltage. Could this be due to a security issue?
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Old 08-25-2011, 04:05 PM   #28
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Loose ECM pin. Problem solved. Shorted fusebox PCB and loose PCM connection, probably of my own doing. 2A draw at initial hookup down to 0.16A over the course of about a minute. I'm going to live with that for now.
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Old 08-25-2011, 04:22 PM   #29
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Sounds good. That'* a bit more manageable then close to 4amps. I will mark this thread as fixed.
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Old 08-25-2011, 04:44 PM   #30
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good to hear you got it figured out
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