Question about Jeep Grand Cherokee

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Changed crankshaft sensor, started fine & test drive ok. sat for 3-4 hrs & would not start check engine light on with fault code 340

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Still having the same issue with error code 340, changed both cam and crank sensors to no avail. Next will check the wiring harness to see if any issues are there. Any other tips?

Posted on Jan 08, 2014

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That code, 340 is No camshaft signal being received by the computer. Might just be the CAMshaft sensor, not the CRANKshaft sensor, that's bad.

Posted on Mar 26, 2011

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Posted on Jan 02, 2017

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The Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type.




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