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IDLE AIR CONTROL MOTOR DESCRIPTION The idle air control valve is mounted on the throt- tle body. The PCM operates the idle air control valve OPERATION The PCM adjusts engine idle speed through the idle air control valve to compensate for engine load, The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The PCM controls engine idle speed by adjusting the position of the idle air control valve. The adjust- When engine rpm is above idle speed, the IAC is used for the following functions: • Off-idle dashpot • Deceleration air flow control • A/C compressor load control (also opens the pas- sage slightly before the compressor is engaged so Target Idle Target idle is determined by the following inputs: • ECT Sensor • Battery voltage • Ambient/Battery Temperature Sensor • VSS • TPS • MAP Sensor REMOVAL When servicing throttle body components, always reassemble components with new O-rings and seals (1) Disconnect negative cable from battery. trol valve (Fig. 17). (3) Remove idle air control valve mounting screw. O-rings is removed with the valve. INSTALLATION When servicing throttle body components, always reassemble components with new O-rings and seals (1) Carefully place idle air control motor into throttle body. Fig. 15 TPS/IAC 2.4L 1 - Idle Air Control Valve Fig. 16 TPS/IAC 3.3/3.8L 1 - Idle Air Control Valve RS FUEL INJECTION 14 - 33 |