New ICM??? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-20-2005, 02:47 PM   #1
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Default New ICM???

Before I pop for a new ICM for the '95 SLE, I thought I'd check with the experts. Car set a code 361 as read by my new Actron scan tool. Closest I could find to that was P01361: ignition not toggling. Went through the diagnostic routine in the '95 FSM all the way to the end where it says: replace ignition control module. The ground is good on the ICM and the connections are clean. The tan-blk wire on terminal B is continuous to the red connector terminal B-15 for the PCM.

Have I missed anything else, or do I just need to get a new/good ICM?
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Old 10-22-2005, 02:43 PM   #2
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Please don't go do this.... When I had that code I was having a lot of driveability issues... I had misses, Backfires once in a while, and a hard start condition, as in I would hit the key and the car would start and then shut off... The SES light was lit once I could get the car to run ok... I got the P1361.... I figured that there was spark, but after 400 rpms the PCM didn't take over... And I too had the ICM not toggling... It was strange... I didn't even mess with the ICM, I went right to my Spare PCM and tested, No more codes, no more start issues, no more backfires...

But again I have seen bad ICM'* test good... Maybe a swap from the SSEi to the SLE? They are the same module.. At least that way you won't waste your money if thats not the problem.... Just a thought

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Old 10-22-2005, 02:58 PM   #3
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Well, I have an identical PCM and prom for the '95 sitting on a shelf in the basement. I'll give that a try first. Thanks, Don.
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Old 10-22-2005, 03:02 PM   #4
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Quote:
Originally Posted by bill buttermore
Well, I have an identical PCM and prom for the '95 sitting on a shelf in the basement. I'll give that a try first. Thanks, Don.
Its always good to have extra parts to test with...

I once told a dealership that my ECM seemed to be taking its slow time getting to its grave... They thought I was nuts and told me that its not the ECM failing... Funny, the car died in the middle of the road... Started it a million times to limp it home...

I'd say if you have the PCM to test with, what do you have to loose

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Old 10-22-2005, 03:32 PM   #5
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Swapped out the PCM -- check engine light is now out. Thank you Don! Hope it lasts. And I hope it doesn't have anything to do with my dummied knock sensors. Maybe my resistor loads are screwin' up the PCM. Don't really see how, but then what I don't know about electronics is pretty much all there is to know!

I had picked up that PCM a couple of months ago when I couldn't get rid of my KR, thinking that might help. But when I swapped it then, I got the same response. I only paid $45 for it. I may shop around for another just to have the security of a spare on hand. Maybe carry it in the trunk.
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Old 10-22-2005, 03:38 PM   #6
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But what is the deal with the diagnostic procedure in the FSM? I followed it to the letter, and it led me right to "replace ICM." If I had, it would'a been $ down the rathole. Goes to show that experience can be better than "book learnin'. Once again, BC saves the day.
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Old 10-22-2005, 04:05 PM   #7
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Quote:
Originally Posted by bill buttermore
But what is the deal with the diagnostic procedure in the FSM? I followed it to the letter, and it led me right to "replace ICM." If I had, it would'a been $ down the rathole. Goes to show that experience can be better than "book learnin'. Once again, BC saves the day.
Sometimes it all makes perfect sense...Other times its the farthest thing from what is and can be...LOL

I am actually on PCM #3... BTW the remans at the autoparts stores for the 94-95 3800 powered cars suck.... I had one that left my car stalling out.... My original I think it was was giving me the P1361 with all of the other issues I listed before... I ended up with a Cardone Reman.... 3 month warranty I think... I never got 1 years out of it, I still have it as a core... Its pretty much junk... I got a Factory PCM from another 95 with low miles on it... I have had no issues with it at all...

I don't think what you have done has cause the PCM to fail... I feel that the 94-95 PCM is as reliable as the 88-91 ECM... I have seen a series of people replace everything under the sun trying to get a vin C 3800 to run, when what they really needed was an ECM...

As for the problem you described, I felt it was either the ICM or the PCM... This must be a common failure for the 94-95 PCM... we have seen several 94-95'* with that very code...

Glad it helped you, and even happier that you had a spare PCM to test with


Oh BTW.... Anytime I go on a trip, I toss my Spare PCM in the trunk ....LOL

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