Those have replaced their ECM...
Melting Slicks
Joined: Dec 2004
Posts: 3,285
Likes: 52
From: Jacksonville, FL
St. Jude Donor '08 thru '26
I had a SES light. I pulled the DTC and then I ran down the flow chart for the DTC in the FSM. In the end I arrived at the conclusion that the ECM was at fault by using all the steps in that DTC's flow chart.
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Mine was caused by the previous owner not fixing a bad sensor, that will kill a ECM/PCM over time.
The only sure ways(that I know) to tell if the ECM/PCM is bad is to replace it w/another ECM/PCM and see if that cures the problem or use a tech1 and multi meter to test out the voltage, if it is getting the correct signal from ECM/PCM and ohm it to check continuity.
The only sure ways(that I know) to tell if the ECM/PCM is bad is to replace it w/another ECM/PCM and see if that cures the problem or use a tech1 and multi meter to test out the voltage, if it is getting the correct signal from ECM/PCM and ohm it to check continuity.
Safety Car
Joined: Jun 2006
Posts: 3,611
Likes: 100
From: Palm Springs,Ca.
2020 C6 of the Year Finalist - Unmodified
Can a bad ECM cause engine to mis and run like its down a couple cylinders ? I am trouble shooting through my 89. I've replaced injectors,plugs, wires, cap, rotor, coil,compression test(all 180) so about all thats left is is ECM. Car runs like ir down a cylinder.
Thanks, didn't mean to hijack thread but I was thinking ecm would be my next thought.
Thanks, didn't mean to hijack thread but I was thinking ecm would be my next thought.
Thread Starter
Le Mans Master
Joined: Mar 2006
Posts: 5,262
Likes: 0
From: E. Amherst NY
Can a bad ECM cause engine to mis and run like its down a couple cylinders ? I am trouble shooting through my 89. I've replaced injectors,plugs, wires, cap, rotor, coil,compression test(all 180) so about all thats left is is ECM. Car runs like ir down a cylinder.
Thanks, didn't mean to hijack thread but I was thinking ecm would be my next thought.
Thanks, didn't mean to hijack thread but I was thinking ecm would be my next thought.
Mine is missing occasionally, and thats what got me to thinking ECM. Sometimes its fine. Other times, not so much. I've heard similar stories where the ECM was the culprit.
Safety Car
Joined: Jun 2006
Posts: 3,611
Likes: 100
From: Palm Springs,Ca.
2020 C6 of the Year Finalist - Unmodified
I'm sure mine is original, where can I find the ecm ? The guy I purchased it from only changed the oil every 3000 miles and never did anything else to the car. It is fairly low milage 48K.
Thread Starter
Le Mans Master
Joined: Mar 2006
Posts: 5,262
Likes: 0
From: E. Amherst NY
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Race Director
Joined: Jun 2001
Posts: 10,956
Likes: 681
From: Marlboro country MA
Mine constantly threw code 43 (bad knock sensors). I replaced the sensors, didn't fix it. Finally, I cut the wires leading to the sensors and put in place fixed resistors of the correct size - still had code 43. Replaced the ECM, all fixed.
Instructor
Joined: Jan 2008
Posts: 118
Likes: 0
From: Austin Texas
LOL oops, the pic appears HUGE on my screen. It is the big chip next to the blue ribbon connector. Under it you can see what looks like dried sap, or discolored coating. Apparently the pins under that chips are shorting out and cooking it.
I have no clue what that chip controls though, probably injectors.
I have no clue what that chip controls though, probably injectors.
Safety Car
Joined: Jul 2008
Posts: 3,966
Likes: 4
From: Made In America
St. Jude Donor '10-'11
Advanced
Joined: Apr 2009
Posts: 77
Likes: 0
From: Canisteo NY