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 Testing:






1. While turning ignition switch "ON" and "OFF," check for "click" at relay.
2. Unplug relay and check that there is no continuity across terminals "A" and "B" or across terminals "C" and "D."
3. Apply 12V and a ground to terminals "E" and "F" of the two-pin connector.
4. Check that continuity now exists across terminals "A" and "B" and across terminals "C" and "D."
5. If not as specified, replace relay.