P0688 Nissan Electronic Control Module Power Relay Control Circuit Open
Possible causes
– Weak battery- Low voltage while cranking
– Faulty Engine Control Module (ECM) relay
– Blown ECM fuse
– Faulty ECM
– ECM harness is open or shorted
– ECM circuit poor electrical connection
– Faulty Engine Control Module (ECM) relay
– Blown ECM fuse
– Faulty ECM
– ECM harness is open or shorted
– ECM circuit poor electrical connection
Tech description
Check all the ECM fuses, if the fuses are OK try replacing the ECM relay.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
Nissan Vehicle:Nissan 370Z,Nissan Altima,Nissan Armada,Nissan Frontier,Nissan GT-R,Nissan Juke,Nissan Maxima,Nissan Murano,Nissan Pathfinder,Nissan Quest,Nissan Rogue,Nissan Sentra,Nissan Titan,Nissan Versa,Nissan Xterra,