1986 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE

Code 6 (Throttle Position Sensor)

  1. Check for poor connections at throttle position sensor connector. Repair or replace as necessary. If connections are okay, measure resistance of throttle position sensor. If resistance is incorrect, replace sensor.
  2. If resistance is correct, measure voltage at terminal "C" of throttle position sensor connector. If reading is 4.5-5.5 volts, go to next step. If not, check for open or short circuit in wiring harness from terminal "C" of sensor to ECU connector. If wiring is okay, replace faulty ECU.
  3. Measure voltage at terminal "2G" of ECU. If reading is more than 4.5 volts, check for open circuit in wiring harness from terminal "A" of throttle position sensor to ECU connector.
  4. If reading is less than .4 volts, check for short circuit in wiring harness from terminal "A" of throttle position sensor to ECU connector. If reading is between .4-4.5 volts, replace faulty ECU.
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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.

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