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Old 12-29-2005, 08:52 AM   #1 (permalink)
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Wrangler sensor location, NEED HELP!

Hey all,
I need to know the location of two sensors on a 2002 Wrangler 4 liter. CAMshaft position sensor and CRANKshaft position sensor. I got a check engine light this morning on the way to work and it was a P0340 code which is a camshaft position sensor. It didn't stop running or backfire or anything. All was well, it just won't restart. After a little research I found that the two can sometimes throw each other's codes. I just need to check the wires to make sure its not just loose. I have already disconnected the battery to clear the code but it comes back instantly when I try to start. It will just crank, but not fire. I think it may be a safety to keep the engine from running without knowing its location. Does anybody have anyexperience with these? Can I replace it myself? I am confident in my abilities but just don't know where the damn things are.

Thanks for any help.

Corey Allhands

Last edited by cawpin; 12-29-2005 at 08:55 AM.
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Old 12-29-2005, 09:02 AM   #2 (permalink)
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crankshaft sensor is located on the top of the bellhousing and is usually the culprit, sometimes if you unplug it the engine will start indicating that it has gone bad. The camshaft sensor is located by the oil filter, where the distributor use to be. I dont think those go as often as the crankshaft sensors do.
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Old 12-29-2005, 09:53 AM   #3 (permalink)
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Thanks for the quick info. I 'll try and check it out during lunch today.
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Old 07-27-2007, 01:03 AM   #4 (permalink)
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The code P0340 or Camshaft Position Sensor Circuit Malfunction indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS (camshaft position sensor) and think that will definitely fix it. You could experience hard starting or no start, rough running / misfiring or loss of engine power.. Some causes of this are failed Jeep wrangler parts such as camshaft position sensor, crankshaft position sensor or PCM.. Other causes are grounded/shorted/broken wire or connector in the circuit... diagnosis can be tricky at times. Here are some things to try:

* Visually inspect all the wiring and connectors in the circuit
* Check for continuity in the circuit wiring
* Check the operation (voltage) of the camshaft position sensor
* Replace the camshaft position sensor as required
* Check the crankshaft position circuit as well
* Replace circuit wiring and/or connectors as required
* Diagnose/replace the PCM as required

Good luck!!!
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Old 07-27-2007, 05:50 AM   #5 (permalink)
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SYMPTOM
P0340-NO CAM SIGNAL AT PCM

WHEN MONITORED
Engine cranking/running.

SET CONDITION
At least 5 seconds have elapsed with Crankshaft Position Sensor signals present but no Camshaft Position Sensor signal.

POSSIBLE CAUSES


Crank position sensor signal
Checking intermittent CMP signal with LAB scope
5 volt supply circuit shorted to ground
5 volt supply circuit open
5 volt supply circuit shorted to voltage
CMP sensor signal circuit shorted ground
CMP sensor signal circuit open
CMP sensor signal circuit shorted to voltage
CMP sensor signal shorted to 5 volt supply circuit
CAM position sensor ground circuit open
PCM - 5 volt supply
PCM - CMP sensor signal
Camshaft position sensor



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Old 07-29-2007, 03:38 PM   #6 (permalink)
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This thread is a year and a half old. It was the camshaft position sensor though. I replaced it and all was well. The magnet had actually come off the inside of the cap.
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