I've swapped two different sensors, one a BWD and the other direct from the dealership ($140), and I'm still throwing a P0340. Checked the pins as directed above, and everything checks fine. Go to the socket and I get straight continuity from the ground plug to the main ground strap/bolt on the firewall, but I get 5v from both plug 1 and 3 when the key is in the on position. Is this what I'm supposed to receive?
- Faulty Camshaft Position Sensor
- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery
- This code is triggered when the Camshaft Position Sensor signal is not detected by the Engine Control Module (ECM) during the first few seconds of engine cranking.
- Sometimes and in some models, low battery voltage or a weak starter may trigger a Camshaft Position Sensor code.
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I`m having an aggravating cps issue with my 95 XJ.
2 weeks ago my cps went out, it was the original sensor, with 234,000 miles on it. got a new one from carquest, fired right up, ran fine since.
yesterday I was idling from a cold start for about 2 minutes, then randomly died for an instant, then caught itself and came back to life. a minute later it flat out died and would crank but no start. 3 ignition toggles and sure enough got a code 11 again, cps. bought a new bwd sensor from AAP, installed it and cleared the codes, fired it up and it ran for 3 seconds and died again, again throwing code 11 for cps.
I exchanged the new sensor I'd just installed for another new BWD one, but I'm afraid to install it in fear it'll just fry right off the bat again forcing me to make a 45 minute hike to get yet another replacement.
all guages work fine, zero blown fuses, fuel pump primes fine when ignition cycles on.
what can be causing my cps to keep failing like this? I did pick up a new cam sensor (ignition pickup, inside the distributor) when I got the replacement cps yesterday after looking at wiring diagrams and seeing the 5v wires (org) for each sensor are tied together. I plan to clean all grounds, double check bellhousing bolts for tightness, and try closing the harness plug terminals down a hair with a pin. but is there anything else that might be contributing to my cps failing so frequently that I should check?
I did pick up a new cam sensor (ignition pickup, inside the distributor) when I got the replacement cps yesterday after looking at wiring diagrams and seeing the 5v wires (org) for each sensor are tied together.
^this^ was my issue. as it turns out, all the cps sensors I thought kept frying were actually still good. my cam sensor on the other hand had frayed wires at it's pigtail (sensor side) and the power supply wire (shared with the cps power supply) was randomly shorting out into the ground wire next to it, causing voltage to the cps to drop to zero, causing instant loss of cps signal. after replacing the cam sensor (aka sync sensor, ignition pickup) it fired right up and stayed running. and I must say, in the 60k miles I have owned this XJ it has never run better than it does now. smooth as glass and picked up a good amount of lower rpm torque. it also warms up much faster now.
I also no longer have my rare/random issue with the tranny not unlocking the torque converter in 3rd and 4th gears. probably because the ground for all the sensors is sourced from the tcu.
"Unplugging and reconnecting the CPS sensor where it connect to the main harness near the back of the intake manifold usually resets the ECU and if the jeep fires right up after doing this you can bet that the CPS is faulty and needs to be replaced."
Best piece of advise I have found! I had what I thought was a TQ converter lockup issue and still think there is something to that problem. But I exchange my transmission fluid, removed the check valve from the cooler line. My issue change to a bad miss at operating temp. Had to leave the jeep on the side of the road one night. After it completely cooled I drove it half way home and parked it to let it cool. Mid day I read this testing procedure went over and tried it before everything cooled. Bam it worked enough to get me home. The ZJ started missing a couple blocks from the house. When i got home, unplug and plug... Worked, Damn, dude (CJ7T) is on to something. Next I measured resistance between B&C about 16K Ohms.
I called the dealer, no CPS, second try NAPA, they had both styles, I bought both as I hadn't crawled under to see which I needed. Drive up on the ramps, determine I need the one bolter. think to myself. Measure B to C, crap 6k ohms, measure the other (two bolter), it shows open. Call NAPA, they have 2 more, I ask the guy to check resistance and it's open. Next drive 20 miles to NAPA to get the CPS that works.
Use about all the long extensions I have, little cursing and the CPS is out. Now the challenge, after 1/2 hr come to realization my hands are just too big. Rock star wife got helped got it in the hole in about 2 mins. Snugged it up, strung the loom around the back of the engine.
Started right up, I drove about 15miles w/o anything.
My 2001 xj has all of the symptoms of a cps issue. Driving down the road and gauges quit working with a "no bus". Drove it home and parked it. Would not start after that. Cranks bit no spark and no fuel. The fuel pump does not run or prime for 3 seconds. When i pull my fuel pump relay and bypass it, it will pump fuel. I replaced my cps and my relays and still no fix. Is there anything else i should try or something i missed?
I havent read all the posts here, but if I could just dovetail. I had a bad CPS back in 09. I replaced with a cheap $30 CPS....Car worked fine for a year and then I started getting check engine lights, sporadic long start sequences, loud thud from 4th to 5th gear and other random car issues. A few months ago, I replaced the CPS with a Mopar OEM $75 CPS. It solved all of my problems. My 01 XJ runs great. There are videos on youtube showing the magnetic difference between a chinese CPS and the Mopar. Do yourself a favor and spend the $75 on the Mopar. Also, this job is much easier with 2 people.