DTC P0404 [MZR-CD (RF Turbo)]


DTC P0404	EGR valve stuck
DETECTION CONDITION	• The PCM monitors the input signal from the EGR valve position sensor while the EGR system is operating. If the output voltage difference is less than threshold when the EGR flow amount changes, the PCM determines that there is a malfunction in the EGR valve. Diagnostic support note • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• EGR valve malfunction


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the WDS or equivalent to the DLC-2. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Is the PENDING CODE for this DTC present?	Yes	Go to the next step.
3		No	Intermittent concern exists. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
4	INSPECT EGR VALVE • Inspect the EGR valve. (See EGR VALVE INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction?	Yes	Replace the EGR valve, then go to Step the next step.
4		No	Go to the next step.
5	VERIFY TROUBLESHOOTING OF DTC P0404 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step.
5		No	Go to the next step.
6	VERIFY AFTER REPAIR PROCEDURE • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
6	VERIFY AFTER REPAIR PROCEDURE • Are any DTCs present?	No	DTC troubleshooting completed.