toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Back-Up Power Source|Page 99 > < EFI Main Relay <--> [Main Relay (Computer/Fuel System)]|Description and Operation
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EFI Main Relay: Testing and Inspection
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Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is off for use by the diagnostic trouble code memory
and air-fuel ratio adaptive control value memory, etc.

Diagnostic Chart

Circuit Diagram

Back-Up Power Source|Page 99 > < EFI Main Relay <--> [Main Relay (Computer/Fuel System)]|Description and Operation