LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1985 >> Prelude Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection System >> System Testing >> Hot Engine
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Hot Engine

  1. Disconnect and plug the lower air suction hose from anti-afterburn valve. Remove air cleaner cover and filter. Raise and support front of vehicle. Set parking brake and block rear wheels.
  2. Place shift lever in second position (selector lever in 2 position) and accelerate above 15 MPH. Quickly release throttle and check for bubbling noise. If bubbling noise is heard, system is okay.
  3. If bubbling noise is not heard, check for voltage at air suction control solenoid valve (Yellow/Green wire). If there is no voltage, check for voltage at control unit connector (Blue wire) with ignition on. There should be voltage.
  4. If no voltage, check Blue wire between ignition coil and control unit. Check speed sensor, thermosensor, intake air temperature sensor, vacuum switch A and vacuum switch C. Check for voltage at control unit connector (Black/Yellow wire) with ignition on.
  5. There should be voltage. If no voltage, check wiring. Check Brown/Black wire for continuity between control unit and ground. There should be continuity.
  6. If there is voltage, disconnect vacuum hose No. 5 from air suction cut-off diaphragm. Check vacuum hose for leaks or disconnected. If okay, replace air suction cut-off diaphragm valve and retest. If there is vacuum, replace air suction cut-off diaphragm and retest.
scientia non olet · About LEMON Manuals