Question about 1999 Dodge Intrepid
I am a Nissan diesel technician and have a problem with a 1999 Dodge Intrepid. (who doesn't), Here it is :Have codes P0622 (Gen Field Circuit) & P01391 (loss of camshaft crank signal) they keep resetting after clearing. I am using a $4000. GENYSIS diagnostic tool to trouble shoot problem. Replaced both cam & crank sensors with no success. The engine still backfires and shuts off. Sometimes it will run great for a few seconds then start acting up. The GENYSIS shows the cam/crank signal to come and go about every 2 seconds. Can't believe it has
jumped timing because it has its moments of running great.Alternator shows to be putting out 13.4+- all the time. This is my 19 yo sons car and he is driving our minivan as a back-up. (not likeing it)
P0622 is for your alternator field not switching properly. This could be caused by a bad BCM(computer), a bad generator (or alternator, same thing), or a wiring problem.
I would check all of your wiring between your generator and your BCM. Check for any damaged or corroded wires. If all of your wires and connectors are good, I would recommend replacing your generator.
Im not liking the 13.4V while running. It shoult be at 14.5V
Have the alternator load tested at your local parts store for free.
If that checks out (or is within tolerable spec) A known problem in this vehicle is the voltage regulator. Because on this vehicle - it is located in the engine controller (BCM) -- controller (BCM) needs to be replaced.
Double check all connections at the battery cable. If good - time, to replace the controller. (especially if you are getting ghost codes like the P01391 cam/crank sensor code).
The engine uses the info from these sensors to tell the plugs the proper time to fire. if the input is bad (bad sensors or wiring FROM the sensors) the output will be just as bad - causing backfiring, and missing.... hoever if the sensors are new, and the wiring checks out - its the BCM that is being the bugger here.
BCM Wiring Diagrams
CLICK HERE 1
CLICK HERE 2
CLICK HERE 3
CLICK HERE 4
If you would like more prints - just let me know.
Also - to clear your codes, you can remove the + battery post, wait a minute, and re-connect.
I have given you alot of info. If you need clarification on anything - please use the "Continue working with this expert" option so we are connected later.
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Posted on Apr 23, 2009
The coil DTCs are sometimes a byproduct of cam/ crank signals beingalmost out-of-sync. It's a self-diagnostic bug that's built into thesoftware that sometimes surfaces in times when (perhaps) the power isbeing shut off to the coil just as it's being evaluated. Loss of cam/crank sync can certainly do that.
Wait. I have an easy earlytest. Disconnect the cam sensor. The engine will start and run withoutit, but will require longer crank time. Should it start and continue torun longer than before (indefinitely, actually), you likely have eithera bad signal from the cam sensor or its timing is reaching the outsideof the usable window for engine management.
If this works, you can rest assured there is a timing problem or camshaft position sensorsignal problem at work. Running on the crank sensor signal alone limitsengine RPMs, but the engine will run pretty-much normally in the lowRPM ranges.
At that point, you need to determine where theproblem lies. A lab scope is a wonderful device for observing cam/crank square wave signals. A dual-trace unit can put the two together,in the same order they are being produced. This can be a breakthroughfor determining whether it's a bad signal or the engine is out of time.
Ifwe have to use probability (we do), I would expect the cam(s) to be outof time. I've never seen a cracked flexplate (flywheel, where cranksignal is generated) on one of these units. It happens in Caravan,where the flexplate breaks at the center, rotates about 12 degrees andthen locks back up.
2.7 engines in Intripid do have a shorthistory of losing cam timing. It's not common, usually is from beingmis-timed to begin with (water pump replacement, et.al). I suggest youdo the cam sensor disconnect test and go from there.
Posted on Apr 23, 2009
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Posted on Jan 02, 2017
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