Dtc P0401 - Mazda 6 Workshop Manual

STEP
12 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE
• Are any DTCs present?
End Of Sie

DTC P0401

DTC P0401 EGR flow insufficient detected
• The PCM monitors the difference between the target air amount and intake air amount while the EGR
system is operating. If the difference between the target air amount and the intake air amount is less than
the threshold, the PCM determines that there is a malfunction in the EGR system.
Diagnostic support note
DETECTION
• MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive
CONDITION
cycle while DTC for the same malfunction has been stored in PCM.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
• Vacuum hose malfunction
• EGR valve malfunction
POSSIBLE
• EGR boost sensor malfunction
CAUSE
• EGR gasket malfunction
• PCM malfunction
F2–124
ON-BOARD DIAGNOSTIC
INSPECTION
MODE.)
Yes Go to the applicable DTC inspection.
(See F2–40 DTC TABLE.)
No Troubleshooting completed.
ACTION
B6E407000400101