DTC P20EE:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)]
id0102k1724100
Details On DTCs
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DESCRIPTION |
SCR converter efficiency below threshold |
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DETECTION CONDITION
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Determination conditions
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• The reduction rate of the NOx value detected by the NOx sensor is under 10 % less than the threshold of the reduction rate of the NOx value calculated by the dosing control unit.
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Preconditions
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• Switch the ignition ON
• Battery voltage: 10.9—16 V
• Average value of NOx flow amount: 0.0005—1.0000 g/sec {0.01—0.03 oz/sec}
• Period of time in which NOx sensor No.1 detects NOx value: 0—1,000 s
• SCR converter purification rate estimated by dosing control unit: 60—100 %
• The following DTCs are not detected for a continuous 50 s.
• CAN communication condition is normal
• Release of dosing strategy for 20 s or more
• Difference in AdBlue® injection volume before and after completion of diesel particulate filter regeneration control continues to be within specified value for more than 120 s
• Average NOx flow amount detected by NOx sensor No.1 continues to be 1.0 g/s {0.035 oz/sec} or more for more than 0.1 s
• When any of the following conditions is met:
• 500 s or more have elapsed since DCU detected ammonia leak
• Cumulative NOx mass detected by NOx sensor No.1: 0.10—4.33 g {0.0035—0.153 oz}
• Average SCR converter temperature: 180—230 °C {356—446 °F}
• NOx concentration detected by NOx sensor No.1: 60—600 ppm
• NOx flow amount detected by NOx sensor No.1: 0.0001—0.0200 g/sec {0.00001—0.00070 oz/sec}
• Exhaust gas flow: 64—230 g/sec {2.3—8.11 oz/sec}
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Drive cycle
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• 1
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Self test type
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• CMDTC self test
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Sensor used
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• NOx sensor No.1
• NOx sensor No.2
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FAIL-SAFE FUNCTION
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• Not applicable
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VEHICLE STATUS WHEN DTCs ARE OUTPUT
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• Illuminates selective catalytic reduction (SCR) warning light.
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POSSIBLE CAUSE
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• NOx sensor No.1 loose
• NOx sensor No.2 loose
• Air leakage or air suction from exhaust system
• SCR system-related part malfunction
• Urea mixer malfunction (deformation)
• Deteriorated AdBlue® penetration
• SCR converter malfunction (deterioration, loss)
• Dosing control unit malfunction
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System Wiring Diagram
Function Explanation (DTC Detection Outline)
Repeatability Verification Procedure
1. Refer to the Technical Guide for the auto diesel particulate filter regeneration control implementation conditions.
2. Switch the ignition OFF and switch it ON (engine off).
3. Start the engine and perform acceleration/deceleration* to a vehicle speed of 0—80 km/h {0—49 mph} for 10 min or more.
PID Item/Simulation Item Used In Diagnosis
PID/DATA monitor item table
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Item |
Definition |
Unit |
Condition/Specification |
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NOX_C_B2S1
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NOx sensor No.1
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— (ppm)
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• Displays the exhaust gas NOx concentration before SCR converter
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NOX_C_B2S2
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NOx sensor No.2
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— (ppm)
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• Displays the exhaust gas NOx concentration after SCR converter
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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 AVAILABILITY
• Verify related Service Bulletins and/or on-line repair information
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service 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: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is the DTC P20EE:00 on 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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Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA.
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3
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PURPOSE: RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (NOx sensor No.1, NOx sensor No.2) on the repair order.
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—
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Go to the next step.
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4
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PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY OTHER RELATED DTCs OCCURRING
• Switch the ignition off, then ON (engine off).
• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
• Is the other PENDING CODE/DTC also present?
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Yes
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Go to the applicable DTC inspection.
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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 IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM OR DOSING CONTROL UNIT
• Access the following PIDs using the M-MDS:
• Is there any signal that is far out of specification?
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Yes
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Go to the next step.
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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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6
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PURPOSE: VERIFY CONNECTOR CONNECTIONS
• Access the following PIDs using the M-MDS:
• When the following parts 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 harness and connector.
• Repair or replace the malfunctioning part.
Go to the troubleshooting procedure to perform the procedure from Step 2.
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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: VERIFY IF THERE IS NO WIRING HARNESS MALFUNCTION IN SENSOR SYSTEM USED FOR DIAGNOSIS
• Perform the KOEO self test.
• Retrieve the dosing control unit DTCs using the M-MDS.
• Are following DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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2
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PURPOSE: INSPECT EXHAUST SYSTEM FOR AIR SUCTION OR LEAKAGE
• Visually inspect for exhaust gas air suction and leakage from the exhaust system.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 8.
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No
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Go to the next step.
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3
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PURPOSE: INSPECT NOx SENSOR NO.1 INSTALLATION CONDITION
• Inspect for NOx sensor No.1 looseness.
• Is the CKP sensor loosen?
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Yes
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Install the NOx sensor No.1 properly, then go to Step 8.
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No
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Go to the next step.
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4
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PURPOSE: INSPECT NOx SENSOR NO.2 INSTALLATION CONDITION
• Inspect for NOx sensor No.2 looseness.
• Is the CKP sensor loosen?
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Yes
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Install the NOx sensor No.2 properly, then go to Step 8.
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No
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Go to the next step.
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5
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PURPOSE: INSPECT UREA INJECTOR FOR CLOGGING
• Remove the urea injector.
• Visually inspect the urea injector for clogging.
• Is there clogging in the urea injector?
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Yes
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Replace the urea injector, then go to the next step.
Go to the next step.
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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 UREA MIXER FOR DEFORMATION
• Visually inspect the urea mixer condition from the urea injector installation hole.
• Is there deformation in the urea mixer?
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Yes
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Replace the SCR converter, then go to Step 8.
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No
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Go to the next step.
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7
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PURPOSE: INSPECT UREA HOSE FOR CLOGGING
• Remove the urea hose.
• Verify the urea hose condition.
• Is there any clogging?
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Yes
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Replace the urea hose, then go to the next step.
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No
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Go to the next step.
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8
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PURPOSE: DETERMINE IF MALFUNCTION CAUSE IS AdBlue® HAS NOT BEEN MIXED WITH DIESEL FUEL OR SRC CONVERTER DETERIORATION
• Verify the condition of the AdBlue®drained from the urea tank in Step 4.
• Is there any evidence of diesel fuel in the AdBlue®?
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Yes
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Replace the AdBlue®, then go to the next step.
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No
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Malfunction by the deterioration of SCR.
Replace the SCR converter, then go to then go to the next step.
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9
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PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION
• Clear the DTC from the dosing control unit memory using the M-MDS.
• Implement the repeatability verification procedure.
• Perform the Pending Trouble Code Access Procedure.
• Is the same Pending DTC present?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the dosing control unit.
Go to the next step.
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No
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Go to the next step.
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10
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PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION
• Is any other DTC or pending code stored?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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