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AEM My Rpm gauge off[RESOLVED]

Posted by kenuwine4g63, Jan 16, 2020

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  1. kenuwine4g63

    kenuwine4g63 Proven Member

    472
    29
    Joined May 26, 2009
    Charlotte, North Carolina
    Im running the aem ems v1 with a 12 tooth disk. My factory rpm gauge is reading off by maybe 1800-2k rpm. I tapped the signal at the ecu from the crankshaft sensor(blue/white) but the car wouldnt start. obviously the signal bypassed and went to the cluster. I disconnected the wire to the ecu pin 58(like you do in evo ecu swaps) and i got the same thing. I tapped into the white wire(transistor Signal for rpm cluster) and came up with the same thing. Am i missing something or what? Rpm reads fine in AEM, the recommended tacho settings dont work on dsms for the oem cluster. Cluster read correctly with all other ecus ive ran so i know its a input/output issue.
     
    kenuwine4g63

    402  0

    1995 Mitsubishi Eclipse GST
    000.0 whp · 000.0 lb/ft · 2G DSM
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  2. DSMPT

    DSMPT Proven Member

    562
    219
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    What's the tacho output number now? IIRC, you need to change the tacho output number if you change the tooth count. I imagine you didn't set it properly when you installed the trigger disc.
    So now it's reading 1800-2000rpm more at idle? If so, try to make the number double and then see if it reads fine or not.
     

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  3. kenuwine4g63

    kenuwine4g63 Proven Member

    472
    29
    Joined May 26, 2009
    Charlotte, North Carolina
    Resolved. Remove the white pin from the ptu. Change the tacho output to 3. MAKE sure you press enter.
     
    kenuwine4g63

    402  0

    1995 Mitsubishi Eclipse GST
    000.0 whp · 000.0 lb/ft · 2G DSM
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