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Home >> Infiniti >> 2011 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1225 Through P2A03 >> DTC P1574: ASCD Vehicle Speed Sensor >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

NOTE:
  • If DTC P1574 is displayed with DTC UXXXX, perform the trouble diagnosis for DTC UXXXX.
  • If DTC P1574 is displayed with DTC P0500, perform the trouble diagnosis for DTC P0500. Refer to "DTC LOGIC ".
  • If DTC P1574 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605. Refer to "DTC LOGIC ".
  • If DTC P1574 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. Refer to "DTC LOGIC ".
DTC DETECTION LOGIC

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P1574 ASCD VHL SPD SEN (ASCD vehicle speed sensor) ECM detects a difference between two vehicle speed signals is out of the specified range.
  • Harness or connectors (The CAN communication line is open or shorted.)
  • Combination meter
  • ABS actuator and electric unit (control unit)
  • Wheel sensor
  • TCM
  • ECM