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

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Main Relay (Computer/Fuel System): Testing and Inspection

Main Relay Inspection:





1. Verify that relay "clicks" when ignition is switched OFF and ON.
2. Unplug relay. Check that there is no continuity across terminals C and D.
3. Apply 12 Volts across terminals A and B.
4. Check that continuity now exists across terminals C and D.
5. If not as specified, replace relay.