P340 Cam shaft signal reference code when cold cranking - JeepForum.com
 
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post #1 of 1 Old 12-06-2019, 07:21 PM Thread Starter
Zippyman1962
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Location: Dothan
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P340 Cam shaft signal reference code when cold cranking

Can a starter cause a p340 code? My 2005 TJ 4.0 manual Jeep only throws the p340 code when sitting overnight with temperatures below 40deg. I have replaced the cam shaft sensor 3x (Dorman, crown, then MOPAR), oPDA, harness connector, had the PCM flashed. The circuit integrity is excellent

My thinking is that the turn over is slower when cold cranking than when the temperature is above 50deg. Could the PCM be looking at the cam shaft signal based on expected timing? I scoped the signal and it is a good 5V square wave, the OPDA was synchronized during its replacement.

As soon as the engine warm I restart it and it clears the code and runs fine (was in limp mode).

My next steps are to replace the speed sensor (uses the same 5V) then the starter, the the PCM

Any help would be appreciated

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