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)

Or, hide this message: temporarily or permanently

Testing W/Voltmeter

Fig. 17 Testing Control Unit W/Voltmeter:





WARNING: Do not start engine.
1. Connect voltmeter to control unit Fig. 17.

Fig. 3 Engine control unit testing procedure chart.:






2. Measure voltage at each terminal and compare to values listed in Fig. 3.