Dodg Caravan 1991/3.3l - tachometer

Discussion in 'General Motoring' started by redryderridesagain, Mar 7, 2011.

  1. The vehicle mentioned in the title has 300,000 KM. Recently noticed
    the tachometer rises smoothly with pressure on the accelerator, but
    seems to over-register the engine rpm. The vehicle behave normally in
    all other respects and the transmission fluid is bright pink. Could
    the pickup or ECM, or TCM be at fault and where and what is the sensor
    that generates the tach dashboard display.

    Thanks
     
    redryderridesagain, Mar 7, 2011
    #1
  2. I have had the following in a text file on my computer for several years:


    1 The 1.6 and 2.0 liter engines are
    manufactured by Mitsubishi, and are also
    used in vehicles produced under their name.
    The same connection configuration applies.

    2 When using pin 43 of the SBEC (Single
    Board Engine Controller) as the tach
    connection point, the NUMBER OF
    CYLINDERS selector on the tachometer is
    set to the 4 cylinder position regardless of
    the number of cylinders in the engine!

    3 In some applications, there may not be a wire
    connected to pin 43 of the Single Board
    Engine Controller, however the tach signal is
    available at this pin.
    8
    CHRYSLER CORPORATION & MITSUBISHI MOTOR CORPORATION 1
    ENGINE CONNECTION DETAILS
    LOCATION/CONNECTOR PIN NO. WIRE COLOR
    1989 1.6 L IGNITION COIL PACK, 4 PIN 3 WHITE
    1990 1.6 L IGNITION COIL PACK, 3 PIN 2 YELLOW/BLACK
    1990 2.0 L IGNITION COIL PACK, 4 PIN 3 WHITE
    1990-93 3.3L, VIN R SINGLE BOARD ENGINE CONTROLLER 43 2 GRAY/LT BLUE3
    1990-93 3.8 L SINGLE BOARD ENGINE CONTROLLER 43 2 GRAY/LT BLUE 3
    1991-92 3.0 L, VIN U SINGLE BOARD ENGINE CONTROLLER 43 2 GRAY/LT BLUE 3
    1992-93 2.0 L IGNITION COIL PACK, 3 PIN 2 YELLOW/GREEN
     
    Daniel who wants to know, Mar 7, 2011
    #2
  3. Also the tach driver board on the gauge cluster had an adjustment pot on it
    on my '89 Sundance 2.2. It was probably for calibration.
     
    Daniel who wants to know, Mar 7, 2011
    #3
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