How do you remove the ECM on this car?

Tiny
CUT213
  • MEMBER
  • 1989 OLDSMOBILE CIERA
  • 2.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 148,000 MILES
Need access to the wire terminals for testing. Found the ECM behind the glove box. Can not see in the small area very well. ECM will wiggle a bit but is held in place by a bracket. Can not see but 1 bolt that is hold it in place. ECM is standing upright, yellow terminal is closest to the radio, with wire terminal's facing down toward the heater air box. The 1 bolt I can see is on the end facing the radio close to the yellow terminal plug-in. What else is holding in in place. I can't get my fingers in the area between the ECM and the upper kick panel area. How much more dis-assembly is this going to take? It's pretty tight on the end nearest the passenger door. Can not see anything up there and I have not felt any other bolts on the ECM box.
Saturday, May 18th, 2024 AT 11:00 AM

2 Replies

Tiny
CUT213
  • MEMBER
  • 25 POSTS
Alright.I figured it out. The one "Bolt" was actually a nut on a stud. I removed the nut and could see the stud was in a slotted bracket. I pulled the ECM forward to get the stud to clear the slot and it popped out and the ECM became very loose. I could tell it did not have any more "Bolts or Studs " holding it. It was not dangling from the top of the ECM. I gently pulled down on the ECM and it came loose and fell down. Turns out there were two line-up dowels in the upper bracket that are attached to the ECM. There is only the one stud and nut that secures the ECM in place along with the two line-up dowels. It's a little hard to re-install because you cannot see holes for the line-up dowels which must be in place before the stud can be lined back up with the slotted bracket and the nut tighten back down to secure the ECM.
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Saturday, May 18th, 2024 AT 4:27 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

I'm glad you were able to remove it. There isn't a lot of room. LOL

I suspect you also needed the connector pinouts. If you look below, pic 1 shows the three different connectors and identifies the pins. The remaining pictures are what each wire/pin is used for.

Let me know if this helps.

Take care,

Joe

See pics below.
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Saturday, May 18th, 2024 AT 8:38 PM

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