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Home >> Infiniti >> 2006 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Q45 - DTC P0327 Through P1168 >> DTC P0643 Sensor Power Supply >> On Board Diagnosis Logic >> Notes

On Board Diagnosis Logic: Notes

This self-diagnosis has the one trip detection logic  .

DTC DETECTING CONDITION CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0643
0643		 Sensor power supply circuit short ECM detects a voltage of power source for sensor is excessively low or high.
  • Harness or connectors (APP sensor 1 circuit is shorted.) (EVAP control system pressure sensor is shorted.) (Refrigerant pressure sensor circuit is shorted.) (PSP sensor circuit is shorted.)
  • Accelerator pedal position sensor
  • EVAP control system pressure sensor
  • Refrigerant pressure sensor
  • Power steering pressure sensor
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