Possible causes
- Faulty Engine Control Module (ECM)
- Engine Control Module (ECM) harness is open or shorted
- Engine Control Module (ECM) circuit poor electrical connection
- Open in back up power source circuit
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1600 1997 Toyota Camry Description
Battery positive voltage is supplied to terminal BATT of the Engine Control Module (ECM) even when the ignition switch is OFF for use by the Detected Trouble Code (DTC) memory and air–fuel ratio adaptive control value memory, etc.
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