05 Cobalt Current Draw (fixed) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-17-2011, 02:49 PM   #11
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The dark blue wire that leads from the relay is grounded. It leaves the box and goes through the firewall, not to the ECM as indicated by the diagrams. Are those for 2205 LT? The ECM is 6 inches from the relay. Is there more than one ECM?
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Old 08-17-2011, 03:12 PM   #12
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The relay plugs into the panel itself, not into one of the harness connectors under the panel.

None of the relay connections in the panel show continuity to ground. This is starting to be pretty worrisome. I can't afford a shop.
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Old 08-17-2011, 03:48 PM   #13
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regardless of where the wire goes it shouldnt be grounded all the time. i dont have a diagram, thats what it gives for a 05 but it says 06.

what do you mean by none of the relay connections are grounded? the ground is controlled by pcm or bcm depending on what circuit, is the one for the cooling fan grounded all the time?
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Old 08-17-2011, 04:23 PM   #14
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I checked the plugs for the CFII relay to see if the control is shorted to ground. None of them show ground. The fan is unplugged.
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Old 08-17-2011, 04:37 PM   #15
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It'* 106 and the car is getting no shade. I put everything back together and I'll start over when the temp drops back under 100.
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Old 08-17-2011, 10:38 PM   #16
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I put everything back together and started again. I now get an 8A draw from the fan with the relay plugged in or a 2A draw with the relay removed. The 2A draw dies down to 0.4A after a minute.

I am getting no fuel pressure.

Car will not crank with fan relay plugged in.

Car will crank with the relay removed. Sometimes it tries to start. No fuel ever comes out the schraeder valve if pressed.

I am suspecting that some wiring inside the fuse panel may be fried.
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Old 08-18-2011, 03:33 PM   #17
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should be two separate things for the crank/run relay to be messed up and the fan. i think you may have the right idea about the wires in there or the bussing or something is messed up in the fuse/relay panel itself.
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Old 08-18-2011, 10:19 PM   #18
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I got the fuse panel out, but now I'm no less confused.

There is a circuit board in the top of the fuse box that the fuses plug into one side and then get routed around to the harness on the bottom. You can't tell which lead on the top goes to which on the bottom.

The wires closest to the relay in question lead out and directly away from the ECU, which is where the diagram shows the wire leading to.

The ECU pin layout I got is for an 06, and it does not match my 05. Anybody got the ECU pinout for an 05 Cobalt LT?

There are 2 things in front of the fuse panel that look like ECUs. One is square and has one connector. The other is rectangle and has 2. What are these? The one with 2 is the ECU, right?

I would think that this is 2 different problems, but the chances of both happening at the same time are pretty thin unless one caused the other.

Fuel pressure is intermittent, but it never starts.

This blows.
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Old 08-19-2011, 05:51 AM   #19
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There'* no way the fan could make the relay go nuts like that, is there? It must be something to do with the control half of the relay for it to switch on and off so fast it makes noise. I assume that'* the source of the noise,anyway.
I disconnected the ECU and the relay did the same thing, so rule out the ECU.
The fuse panel doesn't smell burnt. I seriously doubt that it could be the problem. AllData would be nice. Maybe there'* a bulletin about this.
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Old 08-19-2011, 08:44 AM   #20
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the relay sounds more like the control ground is intermittent, like its loosely touching ground

you can get the schematics from autozone if you sign up, but thats where i put in 2005 cobalt and it says 2006-2008
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