2008 Jeep Commander Sport 3.7L 4WD' On the top front of the PCM there is what appears to be a ground wire (black in color) bolted to the case of the PCM. It is broken off at length of about 10 inches from the PCM. My first question is where is this broken end supposed to be connected to?
My second question is would this effect the EGR valve communications to the PCM? I am getting a check engine light and a code that says the EGR flow rate is insufficient. The EGR valve has been changed TWICE (has cost me about $800 in parts and labor so far), but the code keeps coming back. (The riser tube and manifold have been checked for blockage, and all gaskets were replaced but problem was not solved.) Interesting enough. if I clear the code with a code scanner, the car runs fine for about 8 miles, then the code comes back on, and the car runs rough again. If I clear the code by completely disconnecting the vehicle battery for 30 seconds or so, I can drive about 21 miles with the car running fine, then the check engine light comes on and the car runs poorly again (rough idle, some skips/bogging down at low speeds, but seems to run better at highway speeds). This would indicate to me that the EGR is actually working, but not communicating to the PCM, because if the EGR was not working or had a low flow rare, the car would run poorly even if the check engine light was off....at least that is my though on it. Am I off base on this? BYW. I tried to find a schematic that would show me where the broken wire should connect, but so far I have not found anything that shows it...or at least in a way I could understand. Anyway, all help and suggestions would be appreciated. Also, I do not want to have to take to the dealer or a different mechanic if I can avoid it, as I have pretty much blown my budget on this already. Also, I have detached, cleaned and reattached all the grounds I can find under the hood (battery terminal, ground to the fender by the battery, and the ground (with two wires) on the passenger side fender. HELP!!!!
My second question is would this effect the EGR valve communications to the PCM? I am getting a check engine light and a code that says the EGR flow rate is insufficient. The EGR valve has been changed TWICE (has cost me about $800 in parts and labor so far), but the code keeps coming back. (The riser tube and manifold have been checked for blockage, and all gaskets were replaced but problem was not solved.) Interesting enough. if I clear the code with a code scanner, the car runs fine for about 8 miles, then the code comes back on, and the car runs rough again. If I clear the code by completely disconnecting the vehicle battery for 30 seconds or so, I can drive about 21 miles with the car running fine, then the check engine light comes on and the car runs poorly again (rough idle, some skips/bogging down at low speeds, but seems to run better at highway speeds). This would indicate to me that the EGR is actually working, but not communicating to the PCM, because if the EGR was not working or had a low flow rare, the car would run poorly even if the check engine light was off....at least that is my though on it. Am I off base on this? BYW. I tried to find a schematic that would show me where the broken wire should connect, but so far I have not found anything that shows it...or at least in a way I could understand. Anyway, all help and suggestions would be appreciated. Also, I do not want to have to take to the dealer or a different mechanic if I can avoid it, as I have pretty much blown my budget on this already. Also, I have detached, cleaned and reattached all the grounds I can find under the hood (battery terminal, ground to the fender by the battery, and the ground (with two wires) on the passenger side fender. HELP!!!!
