Question about 2005 Jeep Liberty

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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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    Replaced fuel fill cap

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It sounds like its vapor locking try losing the fuel cap if it runs fine then replace the cap or take it off and drill 1/16 hole in it

Posted on Mar 06, 2009

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Check all engine seals first.

Posted on Mar 06, 2009

  • crysiszone Mar 06, 2009

     Most of the time throttle plate is dirty and after you clean it , problem goes away. Sometime it needs to be adapted. Any body can clean throttle plate, just make sure key is OFF, remove big hose than comes to engine and clean it inside. You can open it with your finger and use any brake or carb clean with rug.


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1 Answer

Engine Service Soon Light On code P0154


Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- 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).

Nov 20, 2013 | 2003 Mitsubishi Montero Sport

1 Answer

How to know if pcm is bad


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.

Jul 15, 2013 | 2004 Jeep Liberty

1 Answer

My 2004 jeep liberty stopped running two fridays ago. my mother was driving it, went into her insurance place and left my 13 y/o son in the car with the car running and a/c on. about 8 minutes into that...


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.

Hope this helps!
Cheers

Jun 14, 2011 | 2004 Jeep Liberty

1 Answer

I have a 2003 ford mustang has no spark i replaced the ignition coil but still no spark,i think it has a bad pcm


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.

Nov 22, 2010 | 2003 Ford Mustang

2 Answers

Our Jeep liberty Po320 code than misfire replaced parts and same codes again than stalls after it get warm. Could this be a PCM units


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.

Jan 16, 2010 | 2002 Jeep Liberty

1 Answer

Go to stop rpms drop jeep liberty shuts off


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 COMMUNICATION. 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 I Hope this will help resolve your issue. Please Rate Me. For any further assistance you can always ask me
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Mar 22, 2009 | 2003 Jeep Liberty

2 Answers

2003 3.7 Liberty check engine light for crank sensor


2003 3.7 Liberty check engine light for crank....what? sensor? You have scanned it?

Mar 06, 2009 | 2005 Jeep Liberty

1 Answer

2003 Liberty Engine Swap Blown Motor How to fix timing.


Hey, did you ever figure this out? Ever consider swapping PCM's for a newer 04 PCM that would be tuned for this engine?

Jun 11, 2008 | 2003 Jeep Liberty

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