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Thread: HELP!!! LS9 Map sensor not reading

  1. #1
    Tuner in Training
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    HELP!!! LS9 Map sensor not reading

    So I have a 68 camaro with a LS1 swap. I have an 0411 PCM with a LS9 map sensor. It will only read 6KPA and not fluctuate. I cannot find the issue. Map characteristics are set accordingly.granger wtf.hpl I have attached the log to show what it is doing.

  2. #2
    Tuning Addict 5FDP's Avatar
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    Is the harness pinned right?

    I thought two pins have to be flip flopped when running those on older harnesses.

    If that is good, remove the channel. Then re-poll for supported parameters under the vehicle tab in the scanner and add the channel back in.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
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    Yes it is pinned right. I have also continuity checked the pins all the way back to the PCM. I have removed the channel more than once and still the same. The crazy part is... without the MAP sensor plugged in, it reads like there is one plugged up. If I plug it in, it doesn't read and doesn't run. I am lost

  4. #4
    Tuning Addict 5FDP's Avatar
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    Hmm, I don't know then. That's a weird one.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  5. #5
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    Someone please help me the hell out! I have checked everything multiple times. I don't know what else to do.

  6. #6
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    I unplug the damn MAP and HPtuners is reading like it is actually working... plut it in, clear the DTC and it goes to 6KPA and dies immediately.

  7. #7
    Tuning Addict blindsquirrel's Avatar
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    You have either a wiring problem or a bad sensor.

  8. #8
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    I have tried four different brand new sensors and shot every wire in it man... idk.

  9. #9
    Tuning Addict 5FDP's Avatar
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    Do you have a different scan tool, like a handheld to see if the sensor reads better on that?

    If it does then something is a possible bug with the VCM scanner.

    Which version of the software are you using?
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.