To perform an OBDII Driving cycle do the following: This cycle can be done in under fifteen minutes. This will perform a diagnostic on all the systems the computer monitors. If you have replaced the battery, disconnected the battery or cleared the codes after making a repair you will need to do what is called a "Driving Cycle". This system is constantly monitoring the sensors and solenoids on the engine. When I determined there are no Relays in the fuse box for the 2.0L, the only other RELAY option was the FCM, so I replaced it because it was plug and play.If you have a 96 or newer vehicle you have the OBD-II diagnostic system. I learned the FCM is a relay by reading on the forum and websites. I determined it was the FCM but deduction. But.I inspected it well down there and could not any evidence of damage. My initial thought of the failure was some kind of physical damage cause by the unbanding of the belt turning and hitting a wire. (takes about 500 miles for a full re-learn) I have the GMPP stage 2 on my car, so I always hate disconnecting the battery then the CPU has to re-learn the tables for my stage 2. It does run when I turn off the car and pump gas. I do hear the fan running while I drive the car. The expansion tank is at operating level. No puddles or fluids under the car at the moment. I would say 85% of the time, it's consistently 199º-201º Occasionally, it will heat to 217º-222º but then immediately the fan kicks on a shoot down to 199º. LAC SKY/ JohnWR - First, thanks for the taking the time to read and respond. One of our electrical gurus will be around shortly. Has it been changed during your ownership? Previous history of the car, was it changed out before you owned it? Then our guys are going to have to determine what else might be wrong for you here? With high temps. has it been replaced at this point Stuck thermostat if your still seeing high temps? If your not. Reset battery ECM/BCM, disconnect for 10 + plus minutes, then see if it resets itself, does the code return? and a trip to the dealerships.ĭO you hear the fan run while sitting still? Does it run on. The expansion tank, it sounds like it is an electrical problem only, not mechanical, does not prevent you from safely driving the car.Īgain here are the temps rising above normal range? High temps can damage motor parts. IF your temps are still good at 199 while driving, no signs of high temps, no puddle of fluid under your car, no loss of fluid in ( P0691 ) and having it erased by Autozone is the problem, fuses seem ok for now. Replacing the fan control module sometime fixes the problem, as you said, your car is cooling itself back to 199 degrees. Replacing the belts is a good thing, at 79,000 miles. I've looked on the forum and tried squeezing my large coolant line and plugging my overflow to put a vaccuum on the line and get the air bubbles out. I have run out of ideas for what could fix this. the fuse is fine, I even tried a new fuse to see if that would work. I have had it erased twice by Autozone, only to return again. after driving on the freshly installed FCM, the engine code come up (P0691). did some trouble shooting and research, I ended up replacing the Fan Control Module -Link : Įverything works great and my car is cooling it self back to 199º perfectly couple days later my car is over-heating badly coolant temp reached 250º (I was already under the car, so I did both) I started the car to see if I could get home, then it snapped in the Costco parking lot. I saw my serpentine belt we becoming unbanded and ready to snap any moment. I heard a weird noise from my engine bay, I shut off my car and popped my hood.
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