Question about 2002 Jeep Liberty
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Posted on Jan 02, 2017
SOURCE: 2002 Jeep Liberty shuts off
Could be a faulty fuel pump. As the pump warms up, when you have a faulty fuel pump they will tend to seize up. When it fails check the fuel pressure with a fuel pressure gauge and see what it reads.
Posted on Aug 14, 2008
wow it sounds like you have a few problems going on. One, your idle speed is set too high and needs to be lowered. Two, i would replace your temperature sensor so that you can monitor your overheating. As well as try and see where the leaking is coming from (i.e. the radiator cap, on the radiator itself, or where the hoses run into the engine-could be engine temperature sensor). Three, if you have to prime your engine at first to get it to run then more than likely fuel pump is going bad.
Posted on Feb 23, 2009
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
Posted on Apr 25, 2009
I don't ever remember seeing a fuel gauge that was connected to the pcm in any car. There pretty much isn't any reason it would be. I have seen numerous problems with dash plug connectors that can cause various gauge problems.(most times cured by cleaning and sometimes slightly bending prongs to get better connection) The sending unit in the tank is part of the pump assembly. i would check for good dash connection and power and continuity at the sender. but question why the pcm needs to be changed, and would only change my opinion if someone could show me a schematic that proves that the gauge connects to the pcm..
Posted on Jul 09, 2009
Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.
Posted on Aug 27, 2009
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