Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Knock Sensor: Testing and Inspection

Component Inspection

KNOCK SENSOR
Use an ohmmeter which can measure more than 10 M Ohm.
1. Disconnect knock sensor harness connector.




2. Check resistance between terminal 1 and ground.
Resistance : 500 - 620 k Ohm [at 25 °C (77 °F)]

CAUTION: Discard any knock sensors that have been dropped or physically damaged. Use only new ones.