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Home >> Honda >> 1985 >> Prelude Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Anti-AFTERBURN System >> Component Testing >> Anti-AFTERBURN Valve >> Hot Engine
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Hot Engine

  1. Disconnect air suction lower hose at anti-afterburn valve. Start engine and quickly raise engine speed to 3500 RPM. Close throttle suddenly. There should be vacuum. If there is vacuum, system is okay.
  2. If there is no vacuum, check for voltage at anti-afterburn control solenoid valve (Blue/Yellow wire). If voltage is available, check for voltage at control unit connector (Blue wire) with ignition switch on. There should be voltage. If no voltage, check Blue wire between ignition coil and control unit.
  3. Check speed sensor and thermosensor. See SPEED SENSOR  and THERMOSENSOR  . . Check for voltage at control unit connector (Black/Yellow wire) with ignition switch on. There should be voltage. If no voltage, check wiring.
  4. Check Brown/Black wire for continuity between control unit and ground. There should be continuity. If there is no voltage, replace anti-afterburn control solenoid valve and retest.
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