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Home >> Lexus >> 2004 >> IS 300 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - System & Component Testing) >> Computerized Engine Controls >> ECM Power Source Circuit (Ignition Keyed) >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2002 Lexus SC 430, 2002 Lexus LS 430, 2002 Lexus IS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

When ignition switch is turned on, 9-14 volts is applied to the terminal IGSW at ECM main relay control circuit. ECM then applies voltage to terminal MREL at ECM, switching EFI main relay on.

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