2003 3.7 Liberty check engine light for crank sensor
Replaced crank sensor w/2 remans, then a new one from Chysler, still comes back on. Replaced pcm. programed w/ vin # mileage 80000 and all updates. It took code off but came back on after warm up. Replaced all spark plugs. Key was checked for code, ok. Turned off remote start add on. Here is the skinny, Jeep will die during idle, after light on or at normal driving speed. Engine will speed up and down w/ rpm of about 2000 then die. It may start back up or may not. Sometime when it dies the tack will jump up and down if key is still on and engine is dead. It may start but run rough,or has had light backfire. It seems to start better after cool down but not always. Sometimes you can drive a couple of miles, run great, then die. This vehicle been checked by a certified mechanic, local chysler dealer and two very good local mechanics. This is my daughters car, her only car. Me I feel this jeep has a mind of it own or is possessed by a spirit unknown to mankind. Please help. Thank you Larry PS what is the skimmer really for?
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Error Code: P0154 Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected Problem areas:
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).
The PCM would probably not keep the engine from cranking. If the check engine light does not come on when you turn the key switch on, I would check to see if all of the fuses are getting power from the key switch first. Could be a problem with the key switch.
I would get the battery checked, even new ones can be bad, I had a Bosch that went bad after 5 months. Get the codes read, my 2003 Liberty recently had a problem starting also, thought it was the fuel pump or filter, code came back as the Crankshaft position sensor being faulty, could be a sensor giving you trouble, mine would start right away once it got warm. When it comes to sensors there is not a lot of difference between making the circuit complete and not.
does the "check engine " light come on with key on. It should. now try to start car, it should go off. If it does not go off, check the Crank Position Sensor. A bad CMP (Crank Position Sensor) will cause no spark.
Po320 is a crank sensor code. Replacement of this sensor is fairly common. I have heard of a chafing concern which occurs near the cam sensor that shorts the power supply to one or both sensors.
I recommend visually checking the harness near the cam and crank sensors for signs of shorting. If no short is found try replacing the crank sensor and see how things go from there. You can clear the code by disconnecting the battery if you dont have a scan tool.
Good Luck and feel free to ask for further assistance with this.
Here are some things that I have run into.
First any sensor cam/crank/tps etc..) that has a reference voltage from the pcm can cause this issue these sensors,(ESPECIALLY THE CRANK SENSORS or CAM Sensor) CAN SHORT OUT INTERNALLY.
THIS WILL CAUSE A NO START CONDITION AND A "NO COMMUNICATION" ISSUE
WITH THE PCM causing stalling. here are some things that I have run into. This condition has caused numerous unneeded pcm replacements. It gets difficult to diagnose when its an intermittent problem.sometimes a tech will install the pcm and let
the jeep leave. Then when temp is right, the sensor shorts and it all
happens again. Often by the time the jeep shows up on the hook the
engine has cooled and the short is gone. In this case the tech has
nothing to go on. YOU MOST LIKELY WONT HAVE A CODE HERE.
THIS IS HOW I DIAGNOSE THE ISSUE. WHEN THE CONDITION IS PRESENT (NO COMMUNICATION") with THE KEY ON, START
DISCONNECTING EACH SENSOR THAT HAS A REFERENCE VOLTAGE. START WITH THE
CRANK SENSOR. IF YOU SEE THE SCANNER GET COMMUNICATION, THEN YOU FOUND
THE SHORTED SENSOR.this CAN BE A PAIN IN THE @** IF THE CONDITION IS INTERMITTENT.
PLEASE NOTE: IT IS EXTREMELY RARE THAT THE PCM ITSELF HAS CAUSED THIS
CONDITION. 99% OF THE TIME ITS A SENSOR SHORTING OUT, WIPING OUT ALL
ALSO NOTE:I HAVE NEVER SEEN THIS CONDITION ACTUALLY DAMAGE THE PCM.
ONCE THE SHORTED SENSOR IS REPLACED, THE PCM IS FINE. THERE IS A
RESISTOR IN THE PCM THAT PROTECTS IT FROM THIS. Good Luck and IHope this will help resolve your issue. Please Rate Me. For any further assistance you can always ask me