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am6zzw00014443
DTC P0401:00 [PCM (SKYACTIV-D)]
id0102t5704200
Details On DTCs
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Description |
HP-EGR control system: Insufficient amount of EGR |
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Detection condition
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Determination conditions
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• The HP-EGR volume is less than 0.2 g/rev for the target value for a continuous 8.2 s.
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Preconditions
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• During HP-EGR control
• Engine speed: 1,200―6,000 rpm
• Fuel injection amount: 4―50 mm3/st
• Engine torque: 20―240 N·m {2.1―24 kgf·m, 15―177 ft·lbf}
• The following DTCs are not detected
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Drive cycle
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• 2
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Self-test type
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• CMDTC self test
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Sensor/unit used
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• HP-EGR control valve
• LP-EGR control valve
• Intake shutter valve
• Exhaust shutter valve
• MAF sensor
• MAP sensor
• Boost air temperature sensor
• Exhaust gas pressure sensor No.1
• Exhaust gas temperature sensor No.1
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Fail-safe
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• Not applicable
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Vehicle status when dtcs are output
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• Check engine light turns on
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Possible cause
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• PCM input signal error
• Intake shutter valve malfunction
• HP-EGR control valve malfunction (stuck closed)
• Air suction from intake-air system piping (between turbocharger and intake manifold)
• HP-EGR malfunction (clogging in HP-EGR piping)
• PCM malfunction
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System Wiring Diagram
Function Explanation (DTC Detection Outline)
am6zzw00014443
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Repeatability Verification Procedure
PID Item/Simulation Item Used In Diagnosis
PID/DATA monitor item table
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Item (definition) |
Reference |
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CHARGE_AIR_COOL_TEMP
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EX_PRES
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EX_GAS_TEMP_1
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MAP
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MAF
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Function Inspection Using M-MDS
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Step |
Inspection |
Results |
Action |
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1
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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?
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Yes
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Perform repair or diagnosis according to the available information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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PURPOSE: VERIFY DTC CAUSING FREEZE FRAME DATA
• Is DTC P0401:00 causing the freeze frame data?
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Yes
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Go to the next step.
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No
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Inspect the DTC causing the freeze frame data.
(See DTC TABLE [PCM (SKYACTIV-D)].)
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3
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PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the freeze frame data/snapshot data.
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—
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Go to the next step.
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4
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PURPOSE: VERIFY OTHER RELATED DTCs
• Perform the DTC inspection for the PCM.
(See DTC INSPECTION)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-D)].)
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No
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Go to the next step.
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5
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PURPOSE: VERIFY RELATED SENSOR INPUT SIGNAL
• Start the engine and warm it up.
• Display the following PIDs using the M-MDS.
(See DTC INSPECTION.)
• Are the monitoring values normal?
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Yes
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.
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No
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Go to the next step.
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6
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PURPOSE: INSPECT WIRING HARNESSES AND CONNECTORS FOR RELATED-SENSOR
• Display the following PIDs using the M-MDS.
(See DTC INSPECTION)
• When the PCM, MAF sensor, MAP sensor, boost air temperature sensor, exhaust gas pressure sensor No.1, and exhaust gas temperature sensor No.1 connectors are shaken, does the PID value include a PID item which has changed?
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Yes
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Inspect the related wiring harnesses and connectors.
• Repair or replace the malfunctioning location.
Go to the troubleshooting procedure to perform the procedure from repair completion verification.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.
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Troubleshooting Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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PURPOSE: INSPECT INTAKE SHUTTER VALVE FOR MALFUNCTION
• Inspect the applicable part.
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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2
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PURPOSE: VERIFY HP-EGR CONTROL VALVE OPERATION CONDITION
• Perform the HP-EGR control inspection.
• Is the HP-EGR control valve operation normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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3
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PURPOSE: INSPECT INTAKE AIR SYSTEM FOR AIR SUCTION
• Visually inspect the following parts of the intake air system for looseness or damage.
• Is the intake air system normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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4
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PURPOSE: INSPECT HP-EGR PASSAGE FOR CLOGGING
• Switch the ignition OFF.
• Remove the HP-EGR control valve.
• Is the gasket correctly installed? Visually inspect the HP-EGR passage for clogging.
• Is the HP-EGR passage normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location, then go to the next step.
(If there is clogging caused by soot in the HP-EGR control valve, inspect around the HP-EGR piping and clean or replace it)
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Repair completion verification 1
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PURPOSE: 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.
• Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
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.
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No
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Go to the next step.
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Repair completion verification 2
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PURPOSE: VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection.
(See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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