Question about 1998 Dodge Ram 1500 4WD
What does the code mean, P1391. where would I start to locate the problem?
Posted by Anonymous on
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Posted on Jan 02, 2017
click on this link, and scroll down to 5.7L
Posted on Dec 22, 2008
Change cam sensor & erase codes.( disconnect battery for a minute or so after.) 340 & 1391 refer to cam sensor problem, and all other 300 codes are cylinder misfires that should disappear when cam sensor fixed.
Posted on Jul 09, 2009
The Auto Shutdown (ASD) Relay is designed to cut off your engine in case of an accident or rollover.
The PCM controls the ASD and I'm thinking that the new PCM isn't programmed properly.
This relay should be in the fuse box under your hood
Posted on Sep 10, 2009
P1391 - Intermittent loss of CMP or CKP.
Generally, this code will indicate that the crankshaft sensor is faulty. The sensor is mounted in a fixed position in the engine block. The tip of the sensor protrudes into the crankcase at a distance of 0.05 plus or minus 0.02 inch from the crankshaft. I would check the wiring harness for loose connections. Inspect the trigger wheel behind the crankshaft pulley and the sensor for damage. replace if needed.
If a crank or cam sensor fails, the engine will not start. both of these sensor circuits can be checked with a voltmeter or lab scope.If the sensors are receiving the correct amount of voltage and have good low-resistance ground circuits, their output should be a pulsing digital signal or voltmeter reading while the engine is cranking.
If any of these conditions do not exist, the circuit needs to be repaired or the sensor needs to be replaced. The location of the Cam shaft sensor will be mounted on the distributor. Use the sensors terminals for testing. Over 7 volts is ok, but anything below that at the sensor will indicate that the sensor wires are bad. If the voltage is low at the PCM, the PCM is suspect.
Posted on Dec 15, 2009
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