DTC DETECTION LOGIC

NOTE:
  • If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to DTC Logic (GT-R certified NISSAN dealer).
  • 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 in turned OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.


DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1572
ASCD brake switch
A)
When the vehicle speed is above 30 km/h (19 MPH), ON signals from the stop lamp switch and the ASCD brake switch are sent to the ECM at the same time.
  • Harness or connectors
    (The stop lamp switch circuit is shorted.)
  • Harness or connectors
    (The ASCD brake switch circuit is shorted.)
  • Stop lamp switch
  • ASCD brake switch
  • Incorrect stop lamp switch installation
  • Incorrect ASCD brake switch installation
  • ECM
B)
ASCD brake switch signal is not sent to ECM for extremely long time while the vehicle is being drived.

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
 
 3.PERFORM DTC CONFIRMATION PROCEDURE