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Which wires are power and ground for the ecm?

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Old 09-29-2008, 12:23 PM
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Default Which wires are power and ground for the ecm?

Looking at my wiring info, it looks like there is 1 orange wire that needs constant, there are 3 ground wires behind the drivers head.

Are there more I'm missing? Just looking to get the computer to communicate with a diagnostic reader

thanks!
Old 09-29-2008, 01:12 PM
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99-02 F-body

C1 Blue
1 - GND
20 - +12v constant
40 - GND
57 - +12v constant

C2 Red
1 - GND
40 - GND
Old 09-29-2008, 01:49 PM
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do you know what those go to on the other end? like did they originally have plugs on them (camaro body plugs for example)
Old 09-29-2008, 02:02 PM
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The constants went to the fuse block connector, the grounds should be terminated at the rear of the engine
Old 09-29-2008, 02:06 PM
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I have 1 that was in one of the c100 plugs, it is orange

I don't know where the second is or what color it should be, for grounds I have 3 on the back of the head, not 4
Old 09-29-2008, 02:36 PM
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I don't have the wiring info in front of me, but I recall wiring:

Constant: ORN C101 G - 10A

Ignition to:
C100 A -page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> (IGN/INJ Bank 1 15A)
C101 B - (IGN/INJ Bank 2 15A)

C100 G - (Tranny/EGR 15A) - I rewired this to my Reverse lockout for T56
C101 E -PNK/BLK 15A - PCM 19 Ignition Positive Voltage for PCM
C105 B -
&nbs
Old 09-29-2008, 02:40 PM
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My set up was a truck so its probably different, the pinouts i put above are for an F-bod though
Old 09-29-2008, 02:49 PM
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well i pulled the computer and grounded all and had power to both places, but still no communication

starting to look like a bad computer to me unless i'm missing something...think i'm going to focus on getting everything else done and see what happens when i turn the key...if nothing else at least the rest of the car will be done
Old 09-30-2008, 09:40 AM
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No communication as in not talking to the scan software? If so did you wire the aldl correctly?
Old 09-30-2008, 11:40 AM
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I'm going to double check again, but I believe the wire was purple, 2 grounds, and a hot wire to the port.

And correct, when I plug in the Snap On scanner and go to anything it says "waiting" and then "no communication"

Someone told me it could be locked by a handheld tuner, is this true?



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