Checking the idle air control (IAC) valve

Check that the resistance of the idle air control (IAC) valve is approximately 10 Ω between terminals #1 and #2.

Check the signal cable between idle air control (IAC) valve terminal #2 and engine control module (ECM) terminal #64. Check for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Try a new idle air control (IAC) valve if no fault is found during the above fault-tracing.

Other information: 

• To connect the breakout box, see Connecting the breakout box. EMS 2000
• To replace the idle air control (IAC) valve, see Replacing the idle air control (IAC) valve .

Fig 1: Identifying Idle Air Control (IAC) Valve Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification