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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Ignition Monitoring Shunt: Testing and Inspection

Ignition Switch (M/T) Circuit:





1. With the ignition switch in the START position, measure the Voltage at ECM terminal 51--should be 8 Volts or more.
2. Verify ECM terminal 71 continuity to ground.
3. Verify ECM terminal 51 continuity to the ignition switch START circuit.