LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2014 >> Q50 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1236 To P2138 (Except Hybrid) >> DTC P1572: Brake Pedal Position Switch >> With ASCD Models >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detection Logic

NOTE:
  • This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed. 1st trip DTC is erased when ignition switch is turned OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.
DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition
P1572 ASCD BRAKE SW (Brake pedal position switch) A When the vehicle speed is above 30 km/h (19 MPH), ON signals from the stop lamp switch and the brake pedal position switch are sent to the ECM at the same time.
B Brake pedal position switch signal is not sent to ECM for extremely long time while the vehicle is being driven.