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Home >> Honda >> 1987 >> 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, turn ignition on and check for voltage at control unit connector (Blue wire). There should be voltage. If there is no voltage, check Blue wire between ignition coil and control unit.
  3. Check speed sensor and thermosensor. See SPEED SENSOR  & THERMOSENSOR  . Turn ignition on, and check for voltage at control unit connector (Black/Yellow wire). There should be voltage. If there is 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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