LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2021 >> QX50 Essential, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (4 Of 5) >> DTC/Circuit Diagnosis >> DTC P2122, P2123: App 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

P2122

00

APP SEN 1/CIRC

(Throttle/Pedal position sensor/switch D circuit low)

Diagnosis condition

Engine running at idle

Signal (terminal)

Accelerator pedal position sensor 1 signal

Threshold

An excessively low voltage is sent to ECM

Diagnosis delay time

--

P2123

00

APP SEN 1/CIRC

(Throttle/Pedal position sensor/switch D circuit high)

Diagnosis condition

Engine running at idle

Signal (terminal)

Accelerator pedal position sensor 1 signal

Threshold

An excessively high voltage is sent to ECM

Diagnosis delay time

--