IM monitors will not set

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  • #16212 Reply


    My IM monitors will not set on my 2001 Dodge Dakota 4.7 liter (evap, catalyst, o2). There is no check engine light but I have noticed my fuel pump is going out. The gas gauge is stuck on empty and the truck doesnt always start up right away. Could a faulty fuel sending unit cause the IM monitors to not set?

  • #16295 Reply


    Yes. The IM flag for the catalyst is the hardest to get to run and pass. The computer looks at many different things before ti will run that test.

    Also, with the EVAP and O2 flags not pass, there may be a problem in those systems- a bad o2 sensor, leak in the EVAP system, etc. With a problem in these, the catalyst will never run and pass.

    To get theses test to run, drive on the highway at a steady speed for about 10 minutes, get off the highway, come to a stop and let it idle for 2 minutes, drive again, let idle again, shut it off for 10 minutes.

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