I dropped my car off at the dealership to get the GM Supercharger Reflash. They call Tech Line and give them what they need, they plug the Tech 2 up to my car, they cant get any communication with my PCM. Car ran perfectly fine before installing the kit, and the car starts right up. All of us stood around scratching our heads. Has anyone ran into this before???
did they checked the fuses and did they put the rigth info in the tech 2, i work for a gm dealer and i have done that a few times.
kevin cabral wrote:did they checked the fuses and did they put the rigth info in the tech 2, i work for a gm dealer and i have done that a few times.
They called Tech and they got the VCI number. The Tech 2 says it is unable to communicate with the processor. All fuses and connections are good. In fact the car will start and run but it is in limp mode due to the connections for the MAP and IAT being disconnected. Do you think that I could be having trouble due to me hardwiring my new TMap harness? No wires are crossed or anything like that, but what I am wondering is if I am having PCM communication failure due to the Low Reference Wires from both the Map Connector and the IAT connector being spliced together before the processor has been reflashed. It is a stab in the dark but it is about the only thing I can think of at the moment unless anyone has any other areas I can check??
check the connection block between the driver side front fender and the firewall. that's the only thing that comes to mind.
Desert Tuners
“When you come across a big kettle of crazy, it’s best not to stir it.”
what year is ur car and make i'm just sititng at my desk at work i can look up the info to find out why its doing that.
dose it even power up the tech 2 to look at anything else
kevin cabral wrote:what year is ur car and make i'm just sititng at my desk at work i can look up the info to find out why its doing that.
Its an 03 Chevy Cavalier 2.2, auto. I just called the dealership, they said that the scan tool does power up and communicates, it just wont take the flash. They said they have tried 2 different types of scan tools other than the tech 2 and they arent getting anything. They called Tech Line and verified that the VCI number is correct. I told them my Theory about the TMap wires all being joined and they told me they havent even looked at it today. The dealer really doesnt want to deal with the car. They told me once to just come get my car out of their shop, and they also told me they are going to charge me 3 hours diagnosis to find out what is going on. So its hard to get any kind of communication from them. Very bad customer service (Taylor Chevrolet, Taylor MI...dont go there)
they must be doin something wrong if its not taking the reflash, i dont think it would have anything to do with the wiring cause the i know comes with a y harness that plugs into the map and iat connector i know the tmap sensor is not suppost to be connected until after the reflash is done. so by the sounds of it that dealer ship does not wanna do anything and how can they charge u 3 hours when nothing was fixed.
kevin cabral wrote:they must be doin something wrong if its not taking the reflash, i dont think it would have anything to do with the wiring cause the i know comes with a y harness that plugs into the map and iat connector i know the tmap sensor is not suppost to be connected until after the reflash is done. so by the sounds of it that dealer ship does not wanna do anything and how can they charge u 3 hours when nothing was fixed.
I have had in the past when attempting to get a reflash done, the scan tool link had problems and I had to get another scan tool, but in there case they said they have tried 3 different scan tools. As for the 3 hours, its B.S. no doubt. They dont have any idea what they are doing, but im up a creek without a paddle, I need to get it done and I authorized it when they called me
thats sucks i know that some of my tune up guys had run into problem like this before because they may of did something wrong during the reflash or something stupid some times if the battery voltage is low i know it would give prolems with the reflash, but by the sounds of it they have someone working on ur car thats hasnt done a lot of programming work and has not followed instruction. well i hope they find the probelm and make sure u have them tell u want the problem was.
Today the dealer called me and told me that they are about 80% sure that my car has a bad PCM and that it will need to be replaced. Luckily my car is still under warranty so that part is going to be free to me. I dont think that is the problem at all. It just doesnt seem logical, especially since the car would start and run. So i dont know, keep your fingers crossed for me so i can get the cavy back from its week long computer reflash
IAT connections are supposed to be plugged into the y harness but not MAP connections. 3 wires stay unplugged and 2 get plugged in. I'm having problems with mine saying that there is low voltage and CEL keeps coming on
I hard wired my map and IAT connections and left the map sensor connector unplugged. They told me they installed the new PCM and tried to flash it and it didnt take the flash. I dont know WTF is going on???
Ok, got my car back from the dealer. They said the flash wouldnt take because of my amp wire being hooked up to the battery was draining the voltage. Makes sense. Now I have been driving it for about two hours, fun as hell. Here is a problem I am having, when I step on the gas from a dead stop, it falls on its face, then goes and has plenty of power all the way through. Only when I take off does it hesitate, then go. The only thing I dont have hooked up is the evap purge soleniod into the throttle body adapter. Anyone experience this before?
Oh and another thing, I took it down the freeway and held the pedal to the wood and when I got to about 108ish it started bouncing off the rev limiter. It wouldnt shift into 4th gear until I got out of it. Yes I know its an auto
Douglas Collins wrote:Oh and another thing, I took it down the freeway and held the pedal to the wood and when I got to about 108ish it started bouncing off the rev limiter. It wouldnt shift into 4th gear until I got out of it. Yes I know its an auto
i dont think that is a rev limiter u where hitting....
Normally that is right about where the speed limiter kicks in but this wasnt the speed limiter, it was clearly the rev limiter. Is that gm's little way of keeping the speed limiter on there?
