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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Controller Test

Controller Test




1. Remove the gauge assembly (A).
2. Disconnect the 22P connector (B).
3. Measure resistance between the B4 and B5 terminals while rotating the adjusting dial. Resistance should vary from 0 to 20,000 ohms as the dial is rotated.