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Old 01-20-2012, 10:25 AM
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TC not engaging

My TC will not engage and my cruise will not set. I have been told they may be related. I have replaced the brake kick out switch on the master cylinder and the brake switch on the pedal. My speedometer works, but I haven't replaced the VSS. I put a breakout box on my ECU and check pin 54. It shows 12+ volts. So I spliced into the v/y wire and took a drive and ground that wire. Mt TC locks fine, so not a tranny problem. I had the tranny scanned by a tranny shop and he said it was electrical somewhere and not in the tranny. I am running out of ideas to try. Anyone have somewhere else to look?
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Old 01-20-2012, 10:42 AM
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Does your third brake light work?
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Old 01-20-2012, 11:17 AM
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Yes. I forgot to mention that one. I still haven't figured out what that has to do with it.
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Old 01-20-2012, 01:57 PM
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I think a faulty brake pressure switch on master cylinder will do it too. You can unplug it and jump both sides of the plug to see if cc and tc lock come back.

Last edited by rpm-inc; 01-20-2012 at 02:14 PM.
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Old 01-21-2012, 08:08 AM
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I already replaced that one. I also jumped across the wiring just to make sure I didn't get a bad one.
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Old 01-31-2012, 11:08 AM
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Found that my PCM thinks my brakes are applied. I can unplug the brake switches and it doesn't change. I can put an Ohm meter on the brake pressure switch and hit the brakes and watch the voltage change. My brake lights all work fine. So, I am down to tracing wires. Not sure what else to check.
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Old 02-06-2012, 12:28 PM
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Pulled the PCM and plugged the breakout box in while scanning the ODB II port. Brakes showing off. Plugged the PCM back in the truck, brakes showing on. Pulled it out again and brakes showing off. Plugged it in the truck again this time being very careful that the plugged went in even. Brakes showing off. Went for a test ride and TC worked perfect and cruise worked again. After is sit for about an hour, they have quit working again. I know it is in the connection with the PCM. I have pulled the wiring harness pretty good looking for a short, but none found. Could it be just a bad PCM? It is just a year old. Just old enough for the warranty to run out.
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