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DTC P0404:00 [PCM (SKYACTIV-D)]

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Outline

System malfunction location	Circuit malfunction in HP-EGR control valve DC motor control system
Detection condition	•  With the following conditions met, the DC motor drive current of the HP-EGR control valve exceeds the specification or the temperature of the DC motor drive circuit is 170 °C {338 °F} or more for a continuous 2 s. ―  Battery positive voltage: 8—16 V ―  0.5 s have elapsed after engine is started
Fail-safe	•  PCM restricts engine torque. •  Limits the maximum engine speed. •  Inhibits the DENOx/DESOx control. •  Inhibits the diesel particulate filter regeneration control. •  Inhibits the EGR control. •  Inhibits engine-stop by operating the i-stop function.
Possible cause	•  HP-EGR control valve connector or terminal malfunction •  Short to ground in HP-EGR control valve control circuit •  PCM connector or terminal malfunction •  Short to power supply in HP-EGR control valve control circuit •  HP-EGR control valve malfunction •  PCM malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION •  Record the freeze frame data/snapshot data. Note •  Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY •  Verify related Service Bulletins, on-line repair information, or Service Information availability. •  Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. •  If the vehicle is not repaired, go to the next step.
		No	Go to the next step.
3	INSPECT HP-EGR CONTROL VALVE/HP-EGR CONTROL VALVE POSITION SENSOR CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT PCM CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT HP-EGR CONTROL VALVE CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT HP-EGR CONTROL VALVE CONTROL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT HP-EGR CONTROL VALVE FOR MALFUNCTION •  Inspect the applicable part. (See HP-EGR CONTROL VALVE INSPECTION [SKYACTIV-D 1.8].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See HP-EGR CONTROL VALVE REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ―  Drive the vehicle on flat roads under the following conditions 5 times repeatedly. 1.  Idle the engine for 20 s. 2.  Accelerate in 2nd gear to 35 km/h {22 mph}and drive the vehicle while maintaining the speed for 25 s. 3.  Stop the vehicle and idle the engine for 20 s. 4.  Accelerate in 3rd gear to 50 km/h {31 mph} and drive the vehicle while maintaining the speed for 50 s. 5.  Stop the vehicle and idle the engine for 20 s. ―  Stop the engine. •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.