94 concours obdII
 

I have a 94 Concours just did an engine replacement and found that the fuel injector harness got very hot at the plug into the main loom. I rewired the porblem and put in the engine now I have a rough idle and 2 OBDII codes 52 deffective ECM, and 109 PCM lost primary battery power. Can anyone help me with this?

RE: 94 concours obdII
 

The 94 was OBD-I not OBD-II.... But anyway, did you swap PCM's with the engines?.... I think I heard somewhere that you need to keep the same PROM chip with each engine... I'd have to look it up as I'm not sure though.

RE: 94 concours obdII
 

Krashed I did use a prom chip from the doner engine. Can you think of any thing else. How can I check if it has lost primary battery power?

RE: 94 concours obdII
 

Wait... LMAO I just looked up those codes for myself. You have nothing to be worried about.

P052 (E052) ----- PCM Memory Reset
This is from the battery being disconnected while you were swapping engines

P109 (E109) ----- Keep Alive Memory (KAM) Reset/PCM has lost primary battery power
And this is also from the battery being disconnected.


All you have to do now is drive it around. After a few drives it should relearn the idle automaticly and you'll be good to go.

RE: 94 concours obdII
 

Krashed,

Thanks for the info. We have put on about 40 miles already. How many miles do you think it takes for it to relearn????

RE: 94 concours obdII
 

Miles don't matter... What matters is key cycles. Turn it on, go for a short drive, then turn it off and repeat... If that doesn't help you'll have to do some further diagnosis

RE: 94 concours obdII
 

Krashed,

Again, thanks for the help and I'll give it a try. I'll let you know if I continue to have the problem.

RE: 94 concours obdII
 

Those codes have no effect on the engine sytems.
Just letting you know the pcm lost power since the last time the codes were cleared.

A rough idle is a vauge description.

Can you narrow it down to an individule cylinder?
Does it seem like a misfire?
Does it drive smooth?

RE: 94 concours obdII
 

To me I thought that it could be a bad injector because I had to rewire the connector I really took my time doing so though. The part was over 700.00 at Cadillac. iIt will drive really good but then when you slow to a light the idle drops too low and starts missing I cant be sure the cylinder because it does not have a misfire code.

RE: 94 concours obdII
 

There is an idle relearn procedure... But I'm at college right now so I can't look it up in my FSM at the moment.

Just out of curiousity, does the ICM "click" repeatedly after you turn the engine off?