Hi...I have a 2005 KIA Optima 4cyl that is giving me, my mechanic, and now the dealer trouble. Long story. The car died on the road at about 15 mph...the tach just dropped to zero! Towed to mechanic...and the Crankshaft Position Sensor was bad. Had that replaced along with the timing belt, and another belt (for oil pump?) while the CPS was replace. Car ran great for 6-8 cycles, mechanic took it on road, and it died within 10 feet of the shop. He tested the new CPS...fine.
However, the CPS was receiving 7.3V v. 5V required signal. The guess is that the PCM is bad and needs to be replaced, but my mechanic could not test whether the PCM was bad. Had the car towed to the dealer (perhaps BIG mistake). They "diagnosed" the probelem, and told the mechanic two different stories, and me two further different stories over 4 phone calls! The dealer says the CPS has frayed harness wire, and needs to be replaced. My mechanic warranteed the work and told them he would fix that since he put that in. NOW...the dealer won't give us the remaining "diagnosis" since they aren't getting the work!....
So, besides a possible short from a frayed wire harness on the CPS, what could cause an over-current sending to CPS? Do we need to replace the PCM, and is there a way to test without having a "good" PCM on-hand?
Any and all HELP will be much appreciated.....
Regards, Chris