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Vans & Minivans GMC Safari & Chevy Astro GMC Safari/Chevy Astro
1889 messages, Last post on Nov 13, 2009 at 9:04 AM
You are in the GMC Safari & Chevy Astro Forum. Your Host is Karens
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I have been chasing codes and repairing the components that would trigger a code. The only code (other that 12) left is... Problem: Code 83 - TCC PWN Solenoid Circuit Fault Rough idle in neutral, almost dies when put into gear. Excessive vibration There is no terminal F wire present at the ALDL so I couldn't check for voltage there. I checked the fuse for "Gages" and I see voltage across both terminals with a DMM. I checked the tan/black wire at the 20 pin connector at the passenger side of the transmission and there was no voltage with the key in the on position. There is supposed to be lettered markings on the male or female end of the plug but I couldn't see any indication of letters molded into either side of the plug. I also cleaned the plug with contact cleaner. I went to check for 12 volts across the brake switch which is described in a TCC test procedure. The procedure references one of two possible brake switches, an upper switch with a vacuum hose and two wires, or, according to the document, there is a lower switch with four wires. The document is ambiguous as to whether one or both of these systems are present on the van. As I am poking around trying to find these components, (which I still have to find) I put my hand on a solenoid that actuates a plunger that has a cable attached to the end and two wires attached to the solenoid, which is attached to the steering column. The solenoid gets so hot when the key is "ON" that I could not leave my finger on the solenoid for a half of one second before it burned my finger! It is located on the steering column and actuates when the brake pedal is depressed a small amount. I am sure that this is a problem because any solenoid that gets that hot has a problem. I do not know the name of this component to get a replacement, so... Question #1 - What is the name of this component so I can tell the parts store the correct name for them to look it up on their computer database? Question #2 - What brake connections do I need to check for voltage beyond the one listed above. I initially could not find a typical brake switch which would be a plunger with two wires connected and attached to the brake pedal directly. I can see where the typical mounts for this type of switch would be located, but nothing is in the mount. Question #3 – Are there other circuits that need to be tested in the TCC circuits. I have asked this question on other forums, with no responses. I hope that one of the readers of this post can assist me. Thanks, James |
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Replying to: stecam78 (Jul 23, 2005 11:11 pm) one of the wires going to the drivers side injector inside the throttle body was rubbing the throttle body itself and had worn away the sheathing on that wire and was therefore grounding out and blowing the ECM fuse down on the fuse block by the drivers brake pedal. Bet you a buck there's a good chance that's your problem Mark 60 
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Replying to: steve34 (Jun 30, 2005 11:10 am) |
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Symptom = rough ide in park, terrible idle in gear. Very good engine performance as soon as it builds to about 2K RPM. Oil Pressure at idle is 30, 60 at 2K RPM. Only Code 12 (of course) and 83 is thrown. Would the bad TTC PWM Solenoid make the van run rough, or is their no relation between a bad idle and this solenoid?? Thanks, James
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Replying to: jdegenhart (Jul 31, 2005 1:50 pm) I have a 1987 astro van and the four bolts in the steering column that hold the tilt u-joint in place have worked loose. I was able to get to two of them but the other two seem to be impossible to reach. Any help with this? Nextlevel |
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For years I've heard a noise from "below" when I make a turn at any speed. I've had several family members listen and I've had a professional mechanic listen. No one can pin point the noise without cracking into something down under. At first, I thought it was only my all terrain Michelin tires "roaring" as a turn was made. However my father thinks that it's something in the rear end. I looked at the differential (without taking it apart) and it was a little low on gear grease, but that problem was quickly solved and the noise is still there. I tow a boat frequently, but it's well within my load range. I tow an even lighter utility trailer, but again well within my load range for that vehicle. Possible differential gearing problems to take place? Or do I need to have it checked out NOW? Otherwise it's been a very solid vehicle with no major problems. FYI 
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I have a 1995 astro with 160,000 miles. It vibrates when put into reverse from underneath driver and passanger side, sometimes worse than others, hot or cold. No tranny work done yet. When I put into reverse there is 3/8 to 1/2 inch movement on the motor mounts. It stops vibrating when put into park or drive. You guys think motor mounts or tranny? Help
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