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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Malfunction Indicator Lamp: Testing and Inspection

MIL Testing:






1. Start engine and verify that "CHECK" light illuminates when ECU terminal 1A (GY/B) is grounded.
2. If lamp does not light, check fuse, bulb, wiring harness, connections and ECU. Replace or repair as needed.