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2003 Dodge Neon R/T 4dr Sedan

2003 Dodge Neon
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
29 mpg city / 36 mpg hwy
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February 16, 2013, 8:09 am

Marty F
 

Question: I'm getting a P0340 error code indicating the camshaft position sensor circuit is faulty

I've done all the continuity checks on the +5v, Gnd and signal voltage from the CMP sensor harness to the ECU connector. I also see a cycling from +5v to 0v when hand cranking the crankshaft. CKP sensor is also sending the +5v to 0v cycle to the ECU when hand cranking the crankshaft. Could this still be an intermittent CMP sensor??? Engine takes a long time cranking before it starts. I was able to clear the code the other day and the engine started right up, but it soon set the code again and now the code appears immediately upon starting. Thanks for your help.


February 19, 2013, 7:43 pm

Elizabeth K
Expert Mechanic

Did you try wiggling the CMP and CKP connector while looking at the signal at the ECU connector? If you've got a short or open in the wiring at the connector, that would be the best way to find it.

From the description, I'd say the problem would be more likely to be an intermittent crank sensor over the cam sensor, since it sounds like it's only affecting starting but not performance. But typically sensors like that don't fail intermittently. Still, it's worth trying to replace the crank sensor, since if you've checked all the wiring, the only other thing left is the ECU.


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