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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Test B: Electronic Engine Control (EC) Power Relay




NOTE
This Pinpoint Test is intended to diagnose the following:
- Harness Circuits: Vehicle Power (VPWR), Ignition Start/Run, Power Relay Ground, Battery Positive Voltage (B+)
- Power Relay

Pinpoint Test Schematics and Connectors

Focus, Contour/Mystique/Cougar:





Taurus/Sable:





LS6/LS8:





All Others:






NOTE: The IGN START/RUN and GROUND circuits, and/or the B+ and VPWR circuits may be reversed in the harness connector. Refer to the Vehicle Wiring Diagram for more information.

Pinpoint Tests