DTC Detection Logic

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTION LOGIC

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P0191	Fuel rail pressure sensor	Fuel rail pressure remains at more than 1.5 MPa (15 bar, 15.3 kg/cm² , 217.5 psi) for 0.2 seconds or more during ignition ON.	Harness or connectors (Fuel rail pressure sensor circuit is open or shorted.) (Power steering pressure sensor circuit is open or shorted.) (Low fuel pressure sensor circuit is open or shorted.) (The electrically-controlled cooling fan coupling circuit is open or shorted) Fuel rail pressure sensor Power steering pressure sensor Low fuel pressure sensor Electrically-controlled cooling fan coupling