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Home >> Infiniti >> 2009 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1140 To P2A03 >> DTC P1572: ASCD Brake Switch >> DTC Confirmation Procedure
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DTC Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.
NOTE:
  • Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be detected.
  • If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next step.
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION: 

Steps   4  and   7  may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle. 

  1. Start engine (VDC switch OFF).
  2. Select "DATA MONITOR" mode with CONSULT-III.
  3. Press MAIN switch and make sure that CRUISE indicator lights up.
  4. Drive the vehicle for at least 5 consecutive seconds under the following condition.
    VEHICLE DRIVING CONDITIONS

    VHCL SPEED SE More than 30 km/h (19 MPH)
    Selector lever Suitable position
  5. Check 1st trip DTC.
  6. If 1st trip DTC is detected, go to "DIAGNOSIS PROCEDURE ".

    If 1st trip DTC is not detected, go to the following step.

  7. Drive the vehicle for at least 5 consecutive seconds under the following condition.
    VEHICLE DRIVING CONDITIONS

    VHCL SPEED SE More than 30 km/h (19 MPH)
    Selector lever Suitable position
    Driving location Depress the brake pedal for more than five seconds so as not to come off from the above-mentioned condition.
  8. Check 1st trip DTC.
  9. If 1st trip DTC is detected, go to "DIAGNOSIS PROCEDURE ".