1982 Mazda RX-7 GSL, Automatic TransFACTORY OEM SERVICE PROCEDURE

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.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.