Measure the resistance of the C/OPN relay.

Remove the 11 clips and intake duct seal.

Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

Install the 2 knock sensors so that they are horizontal as shown in the illustration. Then install the 2 bolts.

Measure the resistance between the terminals.

• Standard resistance:
• 120 to 280 kΩ at 20°C (68°F)

If the result is not as specified, replace the sensor.

Remove the 11 clips and intake duct seal.

Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

Install a new gasket to the intake air surge tank.

Measure the resistance between the terminals.

• Standard resistance:

• Tester Connection	Condition	Specified Condition
  1 (M-) - 2 (M+)	20°C (68°F)	0.3 to 100 Ω
  3 (E2) - 5 (VC)	20°C (68°F)	1.2 to 3.2 Ω

If the result is not as specified, replace the throttle body.

Remove the 11 clips and intake duct seal.