How to do a PCM relearn?

Tiny
#1TRAINWRECK
  • MEMBER
  • 2009 PONTIAC WAVE
  • 1.6L
  • 4 CYL
  • AUTOMATIC
  • 122,000 MILES
I bought this car and replaced the PCM and camshaft sensor twice and crankshaft positioning sensor. Supposed to be a new transmission new starter. I understand that those parts have to be relearned, but nothing is working. I tried what the internet says but it's missing hardly runs. Does not overheat but I don't think that sensor works fan not turning on. The company I bought the PCM from my VIN and said all will. Work my question is, how do I relearn everything?
Saturday, July 23rd, 2022 AT 1:46 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

There is a variation relearn for the crankshaft position sensor, but that wouldn't cause it to run poorly. By chance, have you checked for diagnostic codes again since the new PCM was installed?

Also, try disconnecting the battery for approximately 10 minutes. With both terminals disconnected, take a zip tie and connect the cables together. Let's see if that makes any difference.

Let me know. Also, let me know if there are codes set, if there is any smoke from the exhaust and its color, if there are any odd odors, any odd sounds like hissing or rattling from the exhaust, and so on. Basically, anything you can think of.

Let me know.

Joe
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Tuesday, July 26th, 2022 AT 7:48 PM

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