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Home >> Mazda >> 2021 >> CX-5 Sport, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (On-Board Diagnostic - Engine Control (VIN Y) (2 Of 3)) >> DTC P0401-00: EGR Flow Insufficient Detected >> Details On DTCs

Details On DTCs

WARNING: This page is about a different variant/trim than selected.
DTC P0401:00 (PCM, VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION EGR flow insufficient detected
DETECTION CONDITION Determination conditions
  • When the following condition is met, the EGR volume is lower than the specification for the target value for a continuous specified time.
Preconditions
  • 2 s has passed since the following conditions are met:
    • Intake air temperature: -3.0 °C {37 °F} or more*1
    • Engine coolant temperature: 65.0 °C {149 °F} or more*1
    • Engine speed: 1, 400-2, 600 rpm*1
    • Fuel injection control: during fuel cut
    • The following DTCs are not detected:
      • Intake valve timing control system: P0010:00, P0011:00, and P0012:00
      • CKP sensor and intake CMP sensor: P0016:00
      • TP sensor: P0122:00, P0123:00, and P2135:00
      • ECT sensor No. 1: P0116:00, P0117:00, and P0118:00
      • MAP sensor: P0069:00, P0107:00 and P0108:00
      • EGR valve control system: P0403:00
      • MAF sensor: P0101:00, P0102:00, and P0103:00
      • Exhaust gas pressure sensor: P0472:00 and P0473:00
      • Boost pressure sensor: P0237:00 and P0238:00
  • HO2S: P013A:00
    • Intake manifold is normal
    • Difference between target valve timing and actual valve timing of electric variable valve timing: 3° or less
    • Purge control: not active
      • Charging efficiency: above 0.26
*1 : Standard can be verified by displaying PIDs using MMDS
  Drive cycle
  • 2
Self test type
  • CMDTC self test
Sensor used
  • EGR valve
  • MAF sensor
  • MAP sensor
  • Exhaust gas pressure sensor
FAIL-SAFE FUNCTION Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT
  • The following vehicle conditions differ depending on the type of malfunction
    • Illuminates the check engine light
POSSIBLE CAUSE
  • Erratic signal to PCM
    • MAF sensor signal malfunction
    • MAP sensor signal malfunction
    • Input signal part connector or terminals malfunction
      • Input signal part related circuit malfunction
  • EGR valve malfunction (stuck close)
  • Air suction in intake air system between dynamic pressure turbo (DPT) and intake manifold
  • EGR system passage malfunction (restriction)
  • Exhaust gas pressure sensor malfunction
  • PCM malfunction