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Thread: OBS With LQ4 & 411 PCM Gas Gauge Fix

  1. #1
    Join Date
    Sep 2009
    Location
    NE Ohio
    Posts
    211

    OBS With LQ4 & 411 PCM Gas Gauge Fix

    I cant find this anywhere. I am using HPTUNERS and have the setup in the title. I cant figure this out. I know it can be done with HPTuners.

    Anybody know how to fix this problem?

    Thanks in advance.
    Been lurking since 09 and I finally have my kickass 6.0 LQ4
    LQ4 LQ9 6.0L Engine Service Manual Save to your computer in case it disappears


  2. #2
    Join Date
    Mar 2013
    Location
    Long Beach California
    Posts
    637
    The old gauges use 0-12v signal straight through the float in the tank. The newer pcm requires 0-5v signal via newer style sending unit.... only way I could get around this to use old gauges and keep new pcm happy was to add the newer sending unit to the tank.

    So basically I have two floats in the tank. The original to control the gauge..And the newer style to feed signal to lsx pcm.

  3. #3
    Join Date
    Sep 2009
    Location
    NE Ohio
    Posts
    211
    I just put in a a whole new fuel pump module because mine went out and I dont feel like going through all that again to do what you mentioned. LOL
    Been lurking since 09 and I finally have my kickass 6.0 LQ4
    LQ4 LQ9 6.0L Engine Service Manual Save to your computer in case it disappears


  4. #4
    Join Date
    Jun 2005
    Location
    Way up in North Dakota
    Posts
    351
    Thanks for the wiring-manual links.

  5. #5
    Join Date
    Sep 2009
    Location
    NE Ohio
    Posts
    211
    Quote Originally Posted by metalchips View Post
    Thanks for the wiring-manual links.
    Your welcome. If you need more, let me know. I may have more that I have on my computer that I need to look for.
    Been lurking since 09 and I finally have my kickass 6.0 LQ4
    LQ4 LQ9 6.0L Engine Service Manual Save to your computer in case it disappears


  6. #6
    Join Date
    Nov 2013
    Location
    Fort Hood, TX (for now)
    Posts
    134
    Did you end up finding the remedy to this?

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