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Old 03-21-2012, 08:57 PM   #1
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can someone help me with the ecu pinout diagram of my 1998 GMC sonoma 4.3 please
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Old 03-21-2012, 10:19 PM   #2
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i am sure if is ecu or pcm i need the pinout or connector wires diagram please
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Old 03-22-2012, 08:23 AM   #3
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Not sure if these will help, but they are for my 2000 Blazer 4.3L.
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Old 03-22-2012, 01:16 PM   #4
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thank you this really going to help me
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Old 03-22-2012, 05:22 PM   #5
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I check every single pin and all pins were in the same place as the chart u send me any more ideas of what could this be why I am still not getting a 5 volt reference to the tps sensor ?
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Old 03-22-2012, 05:34 PM   #6
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Ok, hmmm. Which connector/pin are you testing for the 5V?
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Old 03-22-2012, 06:56 PM   #7
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I am testing 12 and 27 on the clear conecctor and tha chart said I should be getting 5 volt reference
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Old 03-22-2012, 07:02 PM   #8
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how are you testing it, backprobing the wire?
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Old 03-22-2012, 07:21 PM   #9
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I am testing them with the neg of the multimeter on battery neg and the positive of the multimeter to the gray cable that comes out of e pcm
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Old 03-22-2012, 07:32 PM   #10
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Don't backprobe either of those pins. Remove the entire C3-CLEAR connector and test those 2 pins again.
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