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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1184 (Engine Control System - DTCS P0643 To P2A03 (VQ40DE)) >> DTC P0643: Sensor Power Supply >> On Board Diagnosis Logic >> Notes

On Board Diagnosis Logic: Notes

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

This self-diagnosis has the one trip detection logic  .

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0643
0643
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.)

    (PSP sensor circuit is shorted.)

    (Refrigerant pressure sensor circuit is shorted.)

    (Battery current sensor circuit is shorted.)

    (EVAP control system pressure sensor circuit is shorted.)

  • Accelerator pedal position sensor

    (APP sensor 1)

  • EVAP control system pressure sensor
  • Power steering pressure sensor
  • Refrigerant pressure sensor
  • Battery current sensor