DTC Detection Logic

WARNING: This page is about a different car, the 2011 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTION CONDITION CHART

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P0078	Exhaust valve timing control magnet retarder (bank 1) circuit	An improper voltage is sent to the ECM through exhaust valve timing control magnet retarder.	Harness or connectors (Exhaust valve timing control magnet retarder circuit is open or shorted.) Exhaust valve timing control magnet retarder
P0084	Exhaust valve timing control magnet retarder (bank 2) circuit