Idle Air Control (IAC) Valve: RAV4

Start engine and warm engine to normal operating temperature. Ensure idle speed is within specification. See 4-CYLINDER IDLE SPEED in ON-VEHICLE ADJUSTMENTS - 4-CYLINDER article.
Turn ignition off. Apply parking brake and place transmission/transaxle in Neutral. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1. See Fig 1. Data link connector No. 1 is located on timing belt end of engine, above generator.
Start engine and note engine RPM. Engine speed should increase to 900-1300 RPM for 5 seconds and then return to idle speed. If engine speed is as specified, turn ignition off and remove jumper wire. If engine speed is not as specified, turn ignition off and remove jumper wire. Test IAC valve resistance and operation. Go to next step.
To test IAC valve resistance, ensure ignition is off. Disconnect electrical connector from IAC valve. IAC valve is located on lower area of throttle body. Using ohmmeter, checking resistance between +B terminal and each remaining terminal on IAC valve. See Fig 2.

Replace IAC valve if resistance is not within specification. See IAC VALVE RESISTANCE SPECIFICATIONS (RAV4) table.

IAC VALVE RESISTANCE SPECIFICATIONS (RAV4)

Temperature

Ohms

Cold ⁽¹⁾

17.0-24.5

Hot ⁽²⁾

21.5-28.5

⁽¹⁾	Cold is with temperature of 14-122°F (-10-50°C).

⁽²⁾	Hot is with temperature of 122-212°F (50-100°C).

To test IAC valve operation, remove IAC valve from throttle body. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article. Apply battery voltage to +B terminal on IAC valve. See Fig 3. Apply battery ground terminal to proper terminal and ensure valve opens and closes. See Fig 3. Replace IAC valve if defective.
If IAC valve resistance is within specification and operates correctly, check wiring circuit between Engine Control Module (ECM) and IAC valve. ECM is located behind instrument panel, near front of center console. For illustration of ECM location, see THEORY & OPERATION article. See WIRING DIAGRAMS article.

Fig 1: Installing Jumper Wire Between Data Link Connector No. 1 Terminals (RAV4)

Fig 2: Testing IAC Valve Resistance (RAV4)

Fig 3: Testing IAC Valve Operation (RAV4)