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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1600: ECM Batt Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

Battery voltage is supplied to BATT terminal at ECM at all times. This circuit is used by diagnostic trouble code memory and air/fuel ratio adaptive control value memory. DTC P1600 is set if there is an open in back-up power source circuit. Possible causes are:

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