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Home >> Honda >> 1981 >> Prelude Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Throttle Control System >> Testing >> Throttle Opener Check >> All Models (Engine Hot)
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All Models (Engine Hot)

  1. Complete "Dashpot System Check" as outlined previously.
  2. Bypass the speed sensor by applying battery voltage to yellow/black wire at throttle opener solenoid connector.
  3. Raise engine speed to 3500 RPM and release throttle. Engine should return to idle in less than 6 seconds, but not faster than dashpot check time.
  4. If return time is less than check valve time, remove vacuum line from throttle opener solenoid valve to throttle control valve. Feel for vacuum at throttle opener solenoid.
  5. If vacuum is present, replace throttle control valve. If no vacuum, replace throttle opener solenoid valve. If return time to idle was more than seconds, replace throttle control valve. After component replacement, retest system and remove jumper wires.
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