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Home › Toyota › 2003 › RAV4 Base, AWD, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System Self Diagnostics › Diagnostic Tests › DTC P1600: Engine Control Module Batt Circuit › Possible Causes

Possible Causes

DTC is set when open in back-up power source is detected. Possible causes are:

Back-up power source circuit is open.
Defective ECM.