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Home >> Acura >> 2002 >> 3.2CL Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Air Induction Systems >> Intake Air Bypass Control Valve
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Intake Air Bypass Control Valve

NOTE: May also be referred to as Fuel Injection Air (FIA) control system.
NOTE: Engine coolant temperature must be less than 104 degrees.
  1. Start engine and let idle. Disconnect vacuum hose from intake air pipe. Connect vacuum gauge to disconnected hose. Increase and decrease RPM. Ensure vacuum reading changes as RPM changes. If vacuum reading does not change, check for following:
    • Misrouted, leaking, broken or clogged Intake Air Bypass (IAB) system vacuum lines.
    • Cracked or defective IAB control valve.
  2. Increase and hold RPM at 3,000 RPM with no load (transmission in park or neutral) until radiator fan comes on, then let idle. Increase and decrease RPM. Ensure vacuum reading does not change with RPM. If vacuum reading changes, check for following:
    • Misrouted, broken or clogged Intake Air Bypass (IAB) system vacuum lines.
    • Cracked or defective IAB control valve (except 3.5RL).
    • Check Idle Air Control (IAC) valve and idle air control thermal valve (3.5RL) operation.
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