PCM TCC control question
06-22-2016, 02:05 PM
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PCM TCC control question I built a standalone harness for my swap short time later my tcc got stuck in lockup after checking everything else I puled Pin 42 from the red connector and it finally unlocked. When I put my meter on the wire for pin 42 it shows as a ground as soon as I plug it back into the PCM I am stuck in lockup again
Is it normal for the TCC wire going to RED connector PIN 42 to show as a ground? If it is then could my PCM of went bad I have checked everything so far and ruled it out as electrical problem but am lost now
Is it normal for the TCC wire going to RED connector PIN 42 to show as a ground? If it is then could my PCM of went bad I have checked everything so far and ruled it out as electrical problem but am lost now
06-23-2016, 02:43 PM
#2
Unplug the wire and check continuity to ground, If you have continuity, it has a short to ground in the wire somewhere. It could be rubbed through in the trans tunnel or pinched somewhere.
If it shows no continuity, I would remove the pin from the harness and insert another pin that just has a short section of wire attached to it, then you can use that wire to see if the PCM is really giving a ground signal. If it is, was there anything changed in the tune? If not then it could be bad PCM.
If it shows no continuity, I would remove the pin from the harness and insert another pin that just has a short section of wire attached to it, then you can use that wire to see if the PCM is really giving a ground signal. If it is, was there anything changed in the tune? If not then it could be bad PCM.
06-23-2016, 10:24 PM
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Thx for the reply I did figure out my TCC lockup my setup is in a 92 s10 and the break light circuit works the same way the TCC does with constant 12v till the break pedal is pressed I had the TCC pedal wire on the wrong end.
I do have code p1860 that I have been chasing forever so far I replaced both TCC and TCC PWM solenoids dropped the V Body and did the Valve upgrade checked continuity on pin 42 and pin 2 both show 12v both pins go to there solenoids. I'm pretty much at a loss I cant check the tune since I borrowed HP tuners at the time and its really just a basic tune so it would run correctly.
Right now I figure either I have a bad PCM or when I stripped down my harness I removed a ground I wasn't suppose to but I cant find out which pin would have the ground circuit the goes to C2 Pin 2 for the TCC PWM
I do have code p1860 that I have been chasing forever so far I replaced both TCC and TCC PWM solenoids dropped the V Body and did the Valve upgrade checked continuity on pin 42 and pin 2 both show 12v both pins go to there solenoids. I'm pretty much at a loss I cant check the tune since I borrowed HP tuners at the time and its really just a basic tune so it would run correctly.
Right now I figure either I have a bad PCM or when I stripped down my harness I removed a ground I wasn't suppose to but I cant find out which pin would have the ground circuit the goes to C2 Pin 2 for the TCC PWM