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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O2S3 - Check O2S Circuit For Shorts

- Key OFF.

- Install Breakout Box (leave PCM disconnected).

- Disconnect the O2S connector.

- Measure the resistance between BOB Test Pin O2S and ground (should read greater than 10,000 ohms).

- Key ON.

- Measure the voltage on BOB Test Pin O2S (should be 0 Volts).

- Are the measurements correct?

Yes -- Replace the O2S.

No -- Service the O2S wire to the PCM.