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Home >> Mazda >> 1982 >> RX-7 GSL, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Auxiliary Control Device >> Testing >> Control Unit
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Control Unit

  1. Check condition of 5 amp fuse, which is located under terminal connectors.
  2. Referring to Fig 1. for terminal locations, check that current flows to terminals "B", "J", "R" and "O" when engine is operating at idle. Voltage of about 3-8 volts should flow to terminal "A" when engine is operating at idle.
  3. Connect negative probe of voltmeter to terminal "P" and positive probe to other terminals as described below and check that 12 volts exist under conditions described:
    NOTE: On models with automatic transmission, place transmission in "PARK". Also disconnect electrical coupler from throttle sensor on carburetor and connect a known good throttle sensor to coupler.
    • At terminal "D" at any engine operating condition.
    • At terminal "E" voltage should be 7.7-8.5 volts at any engine operating condition.
    • At terminal "F" with decreasing engine speed more than 1000-1200 RPM with choke knob fully pushed in (throttle sensor rod fully extends).
    • At terminal "L" with decreasing engine speed less then 1000-1200 RPM.
    • At terminal "N" when applying battery power to terminal "U" with engine operating.
    • At terminal "N" with decreasing engine speed more than 3600-4400 RPM (throttle sensor rod fully extends).
    • At terminal "N" with decreasing engine speed more than 1000-1200 RPM with No. 2 water temperature switch (on radiator) disconnected (throttle sensor rod fully extended).
    • At terminal "Q" (manual transmission) with engine operating and throttle sensor rod fully extended.
    • At terminal "Q" (manual transmission) with decreasing engine speed less than 1000-1200 RPM when throttle sensor rod is fully pushed in.
    • At terminal "Q" (automatic transmission) at any engine operating condition.
    • At terminal "Q" (automatic transmission) with engine operating when throttle sensor coupler (Green/Black wire) is disconnected (throttle sensor rod fully extended).
    • At terminal "Q" (automatic transmission) with decreasing engine speed less than 1000-1200 RPM when starting motor magnetic switch coupler (Black/Yellow wire) is disconnected and throttle sensor rod is fully pushed in.
    • At terminal "S" (except Calif. manual transmission) with engine operating and battery power applied to terminal "C" or terminal "J".
    • At terminal "S" (except Calif. manual transmission) with engine operating and throttle sensor rod fully pushed in.
    • At terminal "S" (except Calif. manual transmission) with decreasing engine speed less than 1000-1200 RPM.
    • At terminal "U" with engine operating and heat hazard sensor electrical coupler disconnected.
      NOTE: On models with automatic transmission, current should stop flowing to terminal "S" when starting motor magnetic switch coupler (Black/Yellow wire) is disconnected.
      Fig 1: Terminal Locations of Control Unit
      G09323274Courtesy of MAZDA MOTORS CORP.

      Unit located under left side of dashboard 

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