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Old 04-08-2015, 03:22 PM   #1
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Default ICM, no power in

I have 0 volts on the power into the ICM. Does anyone know where the other end of the 12v wire is? Thx.
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Old 04-08-2015, 06:17 PM   #2
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I should add I looked at all the fuses I could find that referred to the ignition, PCM and anything that seemed relevant - all good. I'm hoping to something before the PCM. Have an old Haynes manual Buick, Olds, Pontiac full-size front wheel drive. The electrical diagrams don't seem to cover it all. I'll hit a library later that has many manuals for a more complete set of electrical diagrams. I replaced the ICM in October '14 at about 102k. On finding the crank no start, I did the spark test on the towers- no spark. So then checked power to the ICM, no volts. All else works.
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Old 04-10-2015, 01:59 PM   #3
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Old 04-10-2015, 02:24 PM   #4
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Thanks Tech II. I have found the C31 fuse is blowing. Hard to see on the 1st one, but swapping fuses 3x definitely shows blown. I'll be holding off for a day or 2 on further checking. I do have 12v on the hot side of C31.

Regards, Charles
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Old 04-10-2015, 02:32 PM   #5
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Thanks Tech II. I have found the C31 fuse is blowing. Hard to see on the 1st one, but swapping fuses 3x definitely shows blown. I'll be holding off for a day or 2 on further checking. I do have 12v on the hot side of C31. I have used easyauto diagnostics before to do the crank sensor and ICM about 7 months ago. Yesterday I found a crispy plastic duct for the ICM wiring down next to cyl 1 exhaust. That will be next.

Regards, Charles
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