This procedure covers the removal and replacement of the Idle Air Control Valve (IAC) on the 2012-2017 Toyota Camry 2.5L I4 engine to correct idle speed issues.

Warnings

Tools required

Parts

• Idle Air Control Valve × 1 — Use OEM specification
• Throttle body gasket × 1 — 22271-28010 or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely for at least 1 hour
3. Disconnect negative battery terminal and wait 3 minutes to discharge capacitors
4. Remove engine cover by pulling upward on mounting grommets
5. If equipped with OBD-II scanner, record any stored diagnostic codes before beginning

Procedure

1. 1

   Access the throttle body assembly
   Locate the throttle body on the intake manifold. Remove the air intake duct by loosening the hose clamp at the throttle body connection and releasing any clips securing it to the air filter housing. Set aside the intake duct.
2. 2

   Disconnect throttle body electrical connector
   Press down on the locking tab of the throttle body electrical connector and carefully pull it straight off the throttle body. Do not pull on the wires themselves. Move the connector aside to provide clear access.
3. 3

   Disconnect coolant hoses if present
   Using pliers, slide the spring clamps back on the two small coolant bypass hoses connected to the throttle body. Have shop towels ready to catch residual coolant. Pull hoses straight off the throttle body nipples. Plug hoses with suitable plugs to minimize coolant loss.
   ⚠Expect approximately 1-2 ounces of coolant to drain from hoses; have catch container ready
4. 4

   Remove throttle body mounting bolts
   Remove the four 10mm mounting bolts securing the throttle body to the intake manifold. Support the throttle body with one hand while removing the final bolt to prevent it from falling. Note the bolt locations as they may be different lengths.
5. 5

   Remove throttle body assembly
   Carefully pull the throttle body straight away from the intake manifold. The integrated IAC valve is part of this assembly. Inspect the gasket surface on both the throttle body and intake manifold for damage or debris.
6. 6

   Clean mounting surfaces
   Remove and discard the old throttle body gasket. Use a plastic scraper and shop towels to thoroughly clean both gasket surfaces on the intake manifold and throttle body. Do not allow debris to fall into the intake manifold opening. Cover the opening with a clean shop towel when not working directly on it.
   ⚠Do not use metal scrapers on aluminum surfaces as this can cause damage and vacuum leaks
7. 7

   Install new throttle body with IAC valve
   Position the new gasket on the intake manifold surface, ensuring it is properly aligned with all bolt holes and openings. Carefully position the new throttle body assembly (with integrated IAC valve) onto the gasket, aligning it with the mounting holes.
8. 8

   Torque throttle body mounting bolts
   Install all four mounting bolts finger-tight first to ensure proper alignment. Then torque the bolts in a crisscross pattern to specification using a torque wrench. This ensures even gasket compression and prevents vacuum leaks.
   Torque spec

   Mounting Bolts47 Nm (35 lb-ft)
9. 9

   Reconnect coolant hoses
   Reconnect the coolant bypass hoses to the throttle body nipples, pushing them on until fully seated. Slide the spring clamps back into position approximately 1/2 inch from the end of each hose to secure them properly.
10. 10

    Reconnect electrical connector and air intake
    Reconnect the throttle body electrical connector, pressing firmly until the locking tab clicks into place. Reinstall the air intake duct, securing it with the hose clamp at the throttle body and ensuring all clips are properly engaged.
11. 11

    Complete final connections
    Reinstall the engine cover by aligning the grommets and pressing down firmly. Reconnect the negative battery terminal and tighten securely.

Reassembly

1. Check coolant level in overflow reservoir and top off if necessary with Toyota Super Long Life Coolant
2. Verify all electrical connections are secure and all hoses are properly seated
3. Ensure no tools or shop towels were left in the engine compartment

Verification

• Start the engine and allow it to idle; initial idle may be rough for 30-60 seconds as the ECU relearns idle parameters
• Check for vacuum leaks around the throttle body gasket by listening for hissing sounds
• Verify no coolant leaks from bypass hoses at the throttle body
• Allow engine to reach operating temperature and verify idle speed stabilizes between 600-700 RPM
• Test drive vehicle to ensure smooth acceleration and deceleration with no hesitation
• If available, use OBD-II scanner to verify no new diagnostic codes are present and previous IAC-related codes have cleared

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