P0690 MAZDA – Electronic Control Module Power Relay Sense Circuit High

P0690 MAZDA Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0690 MAZDA Possible Causes

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

P0690 MAZDA Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM remains powered up after the ignition switch has been turned OFF.