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Rewiring ECM

Tiny
DAMIAN LEE RITTER
  • MEMBER
  • 1998 PONTIAC SUNFIRE
  • 2.4L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 123,550 MILES
Due to improper attachment of the ecm it was run over ripping out most of the wires. I have hooked them all back up, but I cannot get it to fire and I do not hear the fuel pump engage. The radio, windows, covertable windsheild and starter work. The lights work, but when key is turned they come on dimly. Would anyone be able to send me a diagram or help me figure it out?
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Thursday, May 19th, 2016 AT 5:04 PM

8 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Honestly from what you described happened I would replace the whole harness that was ripped out of the ecm. Even with a used one. Wires that do not look damaged can be damaged inside the insulation.
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Thursday, May 19th, 2016 AT 5:16 PM
Tiny
DAMIAN LEE RITTER
  • MEMBER
  • 5 POSTS
I got one from a junk yard I clipped the wires back far enough to rewire it and I have done a decent job. I am just having some issues like I said most of it is now working, it is just not firing and I do not hear the fuel pump due to the lights coming on with the turn of the key. I am guessing I have that crossed with a fuel pump wire.
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Thursday, May 19th, 2016 AT 5:52 PM
Tiny
DAMIAN LEE RITTER
  • MEMBER
  • 5 POSTS
The problem I believe is in the e4 side I cut the new one about a foot back as you can see. I realize what you mean by some being damaged in other spots in the wiring. I just want to start at the ecm where the visible damage is being broke. I could not get the wiring harness.
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Thursday, May 19th, 2016 AT 5:56 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,640 POSTS
Hey DAMIAN,

Wow that is damaged, you can fix it with a little help from us, here are the wiring diagrams. Let me know how it goes.

Best, Ken
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Saturday, May 21st, 2016 AT 4:04 PM
Tiny
DAMIAN LEE RITTER
  • MEMBER
  • 5 POSTS
Hey Ken thanks for the diagrams but my car has an ecm would it be wired the same as a pcm in these diagrams that's where I've been having issues
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Sunday, May 22nd, 2016 AT 10:55 AM
Tiny
KEN L
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Yes it is wired the same, please let me know how it goes.
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Sunday, May 22nd, 2016 AT 7:39 PM
Tiny
DAMIAN LEE RITTER
  • MEMBER
  • 5 POSTS
Going well so far a few wires that dont match in color but im tracing them back up the wraps now so its taking a bit but I came across a random metal line that looks to be torn off it seems to go to the brake caliper but I cant find where it was torn from I found a random filter just over where my ecm was but it didnt seem to attach to anything
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Friday, June 3rd, 2016 AT 5:55 PM
Tiny
KEN L
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Can you send I picture of both pieces?
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Friday, June 3rd, 2016 AT 6:36 PM

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