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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Testing W/Voltmeter

Fig. 1 Closed Loop System electrical schematic.:




Fig. 2 Engine control unit testing procedure chart.:







DO NOT START ENGINE
1. Connect voltmeter to control unit.
2. With ignition switch ON and engine OFF, measure voltage at each terminal and compare values listed in Fig. 2. Refer to Fig. 1, for terminal locations.