DTC Detection Logic

WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0643

SENSOR POWER/CIRC

(Sensor power supply circuit short)

ECM detects that the voltage of power source for sensor is excessively low or high.

Harness or connectors
(APP sensor 1 circuit is shorted.)

(Electric throttle control actuator circuit is shorted.)

(PSP sensor circuit is shorted.)

(Refrigerant pressure sensor circuit is shorted.)
Accelerator pedal position sensor (APP sensor 1)
Electric throttle control actuator
Power steering pressure sensor
Refrigerant pressure sensor