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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Throttle Position Switch: Testing and Inspection

- Disconnect plugs from oxygen sensor control unit and acceleration enrichment control unit.

EZ Control Unit Right 4-Pin Plug:





- Disconnect right-hand four-pin plut from EZ control unit.
- Connect ohmmeter to terminal 2 of plug and ground. Should be 0 - 0.5 ohms.
- Open throttle valve. Should be infinte ohms.