Question about 2001 Jeep Grand Cherokee

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2001 Jeep Grand Cherokee Engine temg gauge not working

The engine is a 4.0L. I have already replaced the coolant temp sensor at the front of the engine on the thermostat housing and also used a DVOM and checked the resitance level (ohms) on new sensor and also checked the connector for the required 5volt reference voltage and also for a good ground and everything checks out fine. I would like to find a online wiring diagram from the PCM to the gauge or instrument cluster itself so i can check the connections, ground etc. I am afraid that the O2 sytem is never going into closed loop and it is affecting my gas mileage.

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  • cutlass1972_ Dec 20, 2008

    So do you guys think that the gauge not working is semi-superficial or would or could it be tell-tell sign that the PCM might not be getting enough information to put the O2 system into closed loop? If the PCM is receivng/processing the resitance level from the sensor then i can wait to fix the temp gauge in the instrument cluster. Oh and it's been awhile since i was on alldata but doesnt that cost money? Im poor :( any free on line diagrams?

  • yadayada
    yadayada May 11, 2010

    U are going to need access to a factory wiring diagram, u can get this from alldata.com

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If you changed the coolant temperature sensor and it had a 5 volt ref signal to it then you replaced the wrong part. You need to replace the coolant temperature sending unit.  The coolant temp "sensor" is an input to the ECM for your fuel injection system. The coolant temp "sending unit" is for coolant temp reading at the gauge, It is an NTC switch (negative temperature coefficient) which means as temp increases/resistance decreases. 

Posted on Dec 27, 2008

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