fredsmythson Posted November 10, 2013 Report Share Posted November 10, 2013 I'm replacing the PCM computer in my 1999 Lumina with a 3.1L engine. I've read when the computer is replaced, it will produce a P1336 code, and the PCM will need to relearn the crankshaft position data. Does anyone know of a relearn procedure for the 3.1L engine that doesn't need the use of a bidirectional scan tool? Thanks... Quote Link to comment Share on other sites More sharing options...
Cutlass350 Posted November 10, 2013 Report Share Posted November 10, 2013 I'm replacing the PCM computer in my 1999 Lumina with a 3.1L engine.I've read when the computer is replaced, it will produce a P1336 code, and the PCM will need to relearn the crankshaft position data. Does anyone know of a relearn procedure for the 3.1L engine that doesn't need the use of a bidirectional scan tool? Thanks... I read the scanner-free procedure somewhere for another 2000 GM car. Imho, it's not realistic at all. IIRC, it requires the drive wheels to be off the ground, takes ~30 mins, and requires ~10 speed changes that are done with an accuracy of a few seconds per speed change. WTF! Most of the time, you will not get a P1336 error. But, the calibration will not be ideal for that CPS and engine. As long as you never go past ~3K RPMs, you should be fine. It's at the higher RPMs where an improperly calibrated CPS/Engine can cause misfires/pre-detonation/etc. Again, it may or may not be a problem. You can always go to a Dealer or a local shop and have them do the relearn procedure. It's very quick. Still, most places charge a min of 1 hour time. :-P With a new PCM, you'll have to do a Security relearn procedure. That can vary depending on the exact system, year, model, etc. Most GM relearn procedures are similar, but not all. Good Luck! Quote Link to comment Share on other sites More sharing options...
fredsmythson Posted November 10, 2013 Author Report Share Posted November 10, 2013 Thanks for the info! I'm replacing the PCM computer, because of a knock sensor code - P0327 - that I can't resolve. I bought a used PCM on Ebay and they updated it with current software and the car's VIN. They didn't say I would have to deal with a security relearn procedure - only the crankshaft position relearn procedure. I guess I'll just install the used computer and see what happens. I've seen some relearn procedures for other GM vehicles where you drive the car at certain speeds, which would accomplish the PCM relearn, but these were for larger eight cylinder engines. If things don't work out, I can always switch back to the old computer... I hope... I just can't think of bringing this problem to an auto shop... $100 just to look at the car... And then $$$$$ to try and resolve the problem... and it looks like this is a tricky problem to deal with, which most auto shops couldn't resolve... I've been there before... Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted November 10, 2013 Report Share Posted November 10, 2013 shouldn't need to do any type of security relearn.... with a 99 lumina, that information is stored in the passkey2 module. also, wouldn't surprise me at all if the DTC went away with normal driving, GM tends to build in backup methods that require little to no knowledge of how the system works to get it back to correct. Quote Link to comment Share on other sites More sharing options...
fredsmythson Posted November 18, 2013 Author Report Share Posted November 18, 2013 I replaced the PCM computer today with the PCM I purchased on Ebay. It ended up there were no issues with the replacement computer - no crankshaft sensor codes or security codes. I drove the car and after two miles the check engine light came on. Once again, it was the same code I was having a problems with - P0327. So, the replacement computer did not solve the P0327 issue... Back to the drawing board... Thanks for everyone's help... Quote Link to comment Share on other sites More sharing options...
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