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

4-110 Engine Control Module


1. Connect voltmeter between light green/black and black/yellow wire terminals at vacuum switching valve.
2. Start engine and run until it reaches normal operating temperature.
3. Run engine at speed above 1200 RPM.
4. Module is operating properly if voltmeter indicates 12 volts with engine runningabove 1200 RPM.