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Home >> Lexus >> 2001 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System & Component Testing >> Computerized Engine Controls >> ECM Power Source Circuit (Ignition Keyed) >> Circuit Description
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Circuit Description

When ignition switch is turned on, 9-14 volts is applied to terminal IGSW at ECM. Main relay control circuit in ECM then sends a signal to terminal M-REL at ECM to switch EFI main relay on.

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