Idle Air Control (IAC) Valve Inspection

Remove air cleaner outlet hose.
Disconnect connector from IAC valve.
Check for proper connection to IAC valve at each terminal.
Check each coil of IAC valve for resistance. If resistances is out of specification, replace.
IAC valve resistance

Between terminals "1" and "2": 20 - 24 ohm at 20 °C (68 °F)

Between terminals "3" and "2": 20 - 24 ohm at 20 °C (68 °F)

Between terminals "4" and "5": 20 - 24 ohm at 20 °C (68 °F)

Between terminals "6" and "5": 20 - 24 ohm at 20 °C (68 °F)

Fig 1: Checking Resistance Between IAC Valve Terminals
Courtesy of SUZUKI OF AMERICA CORP.
Remove IAC valve from throttle body referring to IDLE AIR CONTROL (IAC) VALVE REMOVAL AND INSTALLATION .
Connect connector to IAC valve.
Check that plunger (1) of IAC valve moves once and then stops as soon as ignition switch (2) is turned from ON position to OFF position.
If plunger (1) of IAC valve does not operate at all, check wire harnesses for open and short. If wire harnesses are in good condition, replace IAC valve and recheck.

NOTE: This check should be performed by two people, one person operates ignition switch while the other checks plunger operation.

Fig 2: Checking Plunger Of IAC Valve
Courtesy of SUZUKI OF AMERICA CORP.
Install IAC valve to throttle body referring to IDLE AIR CONTROL (IAC) VALVE REMOVAL AND INSTALLATION .
Perform the following steps in order to set the IAC valve plunger on the initial position.
1. Turn OFF ignition switch and connect scan tool to DLC.
2. Turn ON ignition switch.
3. Disconnect connector from IAC valve.
4. Connect connector to IAC valve.
5. Clear DTC using scan tool.
6. Start engine and warm up to normal operating temperature.
7. Check for engine idle speed referring to IDLE SPEED / IDLE AIR CONTROL (IAC) DUTY INSPECTION .