P1601 MAZDA – Engine Control Module Supply Voltage

P1601 MAZDA Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1601 MAZDA Possible Causes

Faulty Engine Control Module (ECM),Engine Control Module (ECM) harness is open or shorted,Engine Control Module (ECM) circuit poor electrical connection

P1601 MAZDA Description

Battery positive voltage is supplied to the Engine Control Module (ECM) even when the ignition switch is OFF for use by the Diagnostic Trouble Code (DTC) memory and air?????el ratio adaptive control value memory, etc.