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…
P.S. The car was sent to the dealer with arrangement that we would pay for
the diagnosis, they would provide the diagnosis, and my mechanic would
fix the car. I have not been to the dealer to pay the bill yet. In
general I would think the dealer under this arrangement would follow
through. I’ll pay for what was agreed, but am reluctant to have them
fix anything is they aren’t being straight forward in telling us
what’s wrong.
CPS is Camshaft Position Sensor. CKPS Is Crankshaft Position Sensor. So, are you talking about the Crankshaft Position Sensor?
The CKPS has three wires. The black wire goes to ground. The pink wire carries 12 volts from a 15 amp fuse to the ckps. The yellow wire is the signal return wire from the ckps to the ECM (engine computer). http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280028576
The wires may be shorted together, or maybe not. The wiring connector is another place where grease and gunk in the connector can cause a short between wires. A liberal dose of electrical cleaner, on the disconnected connector, would help that.