LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (2 Of 5) >> DTC/Circuit Diagnosis >> DTC P0191: FRP Sensor >> DTC Description >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detection Logic

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0191

00

FRP SENSOR A

(Fuel Rail Pressure Sensor Circuit Range/Performance Bank 1)

Diagnosis condition

Ignition switch ON

Signal (terminal)

Fuel rail pressure sensor signal

Threshold

Fuel rail pressure remains at more than 14.5 MPa (147.9 kg/cm 2 , 21025 psi)

Diagnosis delay time

0.2 seconds or more