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Home >> Mazda >> 2022 >> CX-5 S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (On-Board Diagnostic - Engine Control System (VIN Y) (4 Of 7)) >> DTC P0402-00: EGR Flow Excessive Detected >> Details On DTCs

Details On DTCs

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DTC P0402-00: (PCM, VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION EGR flow excessive detected
DETECTION CONDITION Determination conditions
  • When the following condition is met, the EGR volume is higher than the specification for the target value for a continuous specified time.
Preconditions
  • If any of the following conditions is met under condition A or condition B:

    Condition A:

  • Mass air flow after the EGR valve is close: 4.4 g {0.16 oz} or more
  • Engine speed: 2, 600 rpm or less
  • Purge control: not active
  • 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: 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:

    Condition B

  • Engine speed: 460 rpm or less
  • Intake manifold pressure before the EGR valve is open: specification
  • Intake manifold pressure after the EGR valve is open: specification
  • The following DTCs are not detected:
  • EGR flow insufficient detected: P0401-00:
Drive cycle
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 open)
  • PCM malfunction