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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Test AR: Random Misfire Detected

PINPOINT TEST AR: RANDOM MISFIRE DETECTED


Flow Chart:






This pinpoint test is intended to diagnose the DTC P0300.

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AR1 : PRELIMINARY DIAGNOSIS FOR DTC P0300

- Retrieve and record all DTCs.
- Record the freeze frame data
- Clear all DTCs
- Carry out the continuous self-test
- Are any DTCs present?






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AR2 : DIAGNOSTIC TROUBLE CODE (DTC) P0300

- Carry out a visual inspection. Check for loose connections, and damaged or corroded pins. Wiggle the harness, attempting to recreate the concern.
- Are any wiring or terminal concerns present?