What is the function of the Idle Air Control (IAC) valve and how can it be checked and replaced on Lexus ES300?

First of all, the engine idle speed is controlled by the Idle Control Valve, which regulates the airflow bypassing the throttle plate into the intake manifold. The IAC valve is controlled by the PCM and adjusts the air intake based on engine demands and operating conditions. To check the IAC valve, apply the parking brake, shift the transaxle to Neutral or Park (automatic), and block the drive wheels. Install a tachometer and start the engine, comparing the idle speed to specifications. If the engine speed changes, the IAC valve is functioning properly; then, measure the IAC valve resistance and if the resistance does not meet specifications, replace the IAC valve. If it does, further investigate the wiring or PCM. If the IAC operates correctly, inspect the wiring harness since the PCM may be defective and should be checked. For replacement, remove the throttle body, detach the IAC valve and gasket, and reinstall using a new gasket.

Genuine Lexus ES300 Idle Control Valve

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5 Idle Control Valves found

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Lexus ES300 Valve Assembly, Idle Speed Control
Part Number: 22270-20050
$271.70 MSRP: $376.61
You Save: $104.91 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Assy, Idle Speed Control(For Throttle Body); Idler Speed Control
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1998-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Valve Assembly, Idle Speed Control
Part Number: 22270-20020
$270.11 MSRP: $374.40
You Save: $104.29 (28%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Assy, Idle Speed Control(For Throttle Body); Idler Speed Control
- Manufacturer Note: BRAZIL SPEC & W/O(VVT)
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1995-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Valve Assembly, Idle Speed Control
Part Number: 22270-20040
$274.61 MSRP: $374.40
You Save: $99.79 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Assy, Idle Speed Control(For Throttle Body)
- Replaced by: 22270-0A040
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-1999 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Valve Assembly, Idle Speed Control
Part Number: 22270-20010
Product Specifications
- Other Name: Valve Assy, Idle Speed Control(For Throttle Body); Idler Speed Control
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1993-1996 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK
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Lexus ES300 Valve Assembly, Idle Speed Control
Part Number: 22270-62020
Product Specifications
- Other Name: Valve Assy, Idle Speed Control(For Throttle Body); Idler Speed Control
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-1994 Lexus ES300 | 6 Cyl 3.0L | 3VZFE; 3VZFE; VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK

Lexus ES300 Idle Control Valve

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Lexus ES300 Idle Control Valve Parts Questions & Experts Answers

Valve Assembly, Idle Speed Control
22270-20050
Q: What is the function of the Idle Air Control (IAC) valve and how can it be checked and replaced on Lexus ES300?
A: First of all, the engine idle speed is controlled by the Idle Control Valve, which regulates the airflow bypassing the throttle plate into the intake manifold. The IAC valve is controlled by the PCM and adjusts the air intake based on engine demands and operating conditions. To check the IAC valve, apply the parking brake, shift the transaxle to Neutral or Park (automatic), and block the drive wheels. Install a tachometer and start the engine, comparing the idle speed to specifications. If the engine speed changes, the IAC valve is functioning properly; then, measure the IAC valve resistance and if the resistance does not meet specifications, replace the IAC valve. If it does, further investigate the wiring or PCM. If the IAC operates correctly, inspect the wiring harness since the PCM may be defective and should be checked. For replacement, remove the throttle body, detach the IAC valve and gasket, and reinstall using a new gasket.