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Thread: No RPM signal from ECU - 3SGTE 4gen Swap

  1. #1
    Forum Member 1st year Apprentice
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    Apr 2017
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    Default No RPM signal from ECU - 3SGTE 4gen Swap

    Hello everybody,

    I have my car working (it starts) after swap, but I don't have RPM info so I check ECU diagram and I find the PIN for TACH: C-27. It's a black wire with double dot (Black--).

    To check that output signal, I start the engine and check with multimeter/voltimeter and oscilloscope, but there isn't any signal.

    Please, anybody could help me?

    Thanks in advance

  2. #2
    C2H5OH Powered Automotive Encyclopaedia George's Avatar
    Join Date
    May 2010
    Location
    Moscow
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    823

    Default Re: No RPM signal from ECU - 3SGTE 4gen Swap

    use any LED in series with a resistor (say 1k Ohm) and try all pins of the two body loom plugs
    Both for positive and negative pulses
    Should take under 10 minutes
    USSR GAZ24 with 1UZ-FE VVTi (UCV24) http://www.toymods.org.au/forums/showthread.php?t=60301
    Engine conversion is when you drive a shitbox which costs a whole LEXUS to own

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