Remove the No. 2 relay block cover.

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

Connect the 3 connectors.

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