DTC P0421:00 [PCM (SKYACTIV-D 2.2)]

id0102j5704400

Note

•  To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”.

Details On DTCs

DESCRIPTION	Catalyst efficiency below threshold
DETECTION CONDITION	Determination conditions	•  The PCM determines that the actual heat amount of the exhaust gas is lower than the estimated heat amount under the vehicle conditions after post injection is completed during diesel particulate filter regeneration control. ―   Estimated exhaust gas temperature sensor No.3 without oxidation reaction: 188 °C {370 °F} or more ―  Exhaust gas temperature sensor No.2: 160—280 °C {320—536 °F} ―  The catalyst heat acumulative time: more than 200 s
DETECTION CONDITION	Preconditions	•  If any of the following conditions is met under condition A, condition B and condition C: Condition A: ―  Diesel particulate filter regeneration after P0421:00 monitor completion is completed ―  Diesel particulate filter regeneration control is not performed ―  Diesel particulate filter regeneration after fuel injection learning is completed ―  Exhaust temperature sensor No.2/No.3 learning for P0421:00 is completed When the following conditions are met, "Exhaust temperature sensor No.2/No.3 learning*1 for P0421:00" is "completed" •  Period vehicle being left: 6 h or more •  Difference between exhaust gas temperature No.2 and exhaust gas temperature No.3 (absolute value): less than 40 °C {104 °F} or more •  Exhaust gas temperature sensor No.2: more than -10 °C {14 °F} •  Exhaust gas temperature sensor No.3: more than -10 °C {14 °F} •  Charge air temperature: more than -10 °C {14 °F} When the following conditions are met, "Exhaust temperature sensor No.2/No.3 learning*1 for P0421:00" is "not completed" •  PCM reprogram •  Battery reset ―  Diesel particulate filter regeneration after following DTC are set P007D:00, P007C:00, P0113:00, P0112:00, P0111:00, P0108:00, P0107:00, P2229:00, P2228:00, P0103:00, P0102:00, P0406:00, P0405:00, P2032:00, P242C:00, P2455:00, P2454:00, P0337:00, P0336:00, P1118:00, P1119:00, P0472:00, P0473:00, P0545:00, P2146:00, P2149:00, P2148:00, P2151:00, P2147:00, P2150:00, P1379:00, P1378:00, P0201:00, P0203:00, P0204:00, P0202:00, P062B:00, P0546:00, P2033:00, P242D:00, P161E:00, P16B2:00, P161F:00, P16B3:00, P01C6:00, P01C5:00, P018D:00, P018C:00, P10C3:00, P10C2:00, P10C6:00, P10C5:00, P10C9:00, P10C8:00, P10CC:00, P10CB:00, P10C1:00, P10C4:00, P10C7:00, P10CA:00, P10CD:00, P10D1:00, P10D2:00, P10D3:00, P10D4:00, P10D5:00, U1201:00, U1202:00, U1203:00, U1204:00, P2696:00, P268C:00, P268D:00, P268E:00, P268F:00, P02CD:00, P02CC:00, P02CF:00, P02CE:00, P02D1:00, P02D0:00, P02D3:00, P02D2:00, P1041:00, P1042:00, P1043:00, P1044:00, P2031:00, P242B:00 *1: For the exhaust gas temperature sensor No.2/No.3 learning, the PCM learns the difference between the exhaust gas temperature sensors No.2 and No.3 with the ignition switched ON (engine off). Condition B: the following conditions continue for 3 s or more ―  Battery voltage: 8—16 V ―  Within 1 min after engine start ―  IAT (IAT sensor No.1): -10 °C {14 °F} or more ―  Barometric pressure: 72.23 kPa {0.7365 kgf/cm2, 10.48 psi} or more ―  ECT: 60 °C {140 °F} or more ―  Vehicle speed: 15 km/h {9.3 mph} or more ―  Fuel injection-based modeled PM accumulation quantity: 0—7.75 g/L ―   Exhaust gas pressure sensor No.2-based modeled PM accumulation quantity: 0—7.75 g/L ―  Amount of exhaust gas: 0—3.5 m3/min Condition C: ―  HC coverage: 0.12 or more ―  Estimated exhaust gas temperature sensor No.3 without oxidation reaction is specified vlaue or more
	Drive cycle	•  2
	Self test type	•  CMDTC self test
	Sensor used	•  Exhaust gas temperature sensor No.2 •  Exhaust gas temperature sensor No.3
FAIL-SAFE FUNCTION	•  Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	•  Check engine light is illuminated
POSSIBLE CAUSE	•  Erratic signal to PCM ―  Exhaust gas temperature sensor No.2 signal malfunction ―  Exhaust gas temperature sensor No.3 signal malfunction ―  Input signal part connector or terminals malfunction ―  Input signal part related circuit malfunction •  Exhaust gas leakage from exhaust system •  Exhaust gas temperature sensor No.2 malfunction •  Exhaust gas temperature sensor No.3 malfunction •  Improper operation of fuel injector •  Catalytic converter or diesel particulate filter malfunction (deformation, damage) •  PCM malfunction

System Wiring Diagram

•  Not applicable

Function Explanation (DTC Detection Outline)

•  The PCM performs diagnosis by monitoring the reaction heat which occurs during the oxidation reaction of the catalytic converter.

•  The PCM performs post injection when the preconditions are met during a drive cycle and it effectuates the oxidation reaction of the catalytic converter.

•  The PCM calculates theory catalyst heat and real catalyst heat after post injection.

•  Theory catalyst heat modelled normal catalyst reaction. Real catalyst heat calculated real catalyst reaction from exhaust gas temperature sensor No.2 and exhaust gas temperature sensor No.3.

•  When the condition that might react enough was concluded, the PCM converted catalyst heat to catalyst heat rate and compares theory catalyst heat rate with real catalyst heat rate.

•  If the PCM determines a malfunction, it stores a pending code.

•  If the PCM determines that the malfunction recurs from the next drive cycle and thereafter, it stores a DTC and turns on the check engine light.

ac8wzw00002914

Repeatability Verification Procedure

1.  Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)].)

2.  Visually inspect the exhaust gas temperature sensor No.2 and No.3 for damage and open circuit.

3.  Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

4.  Perform compulsory diesel particulate filter regeneration. (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 2.2].)

5.  Access the following PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

―  EXHTEMP2

―  EXHTEMP3

6.  Drive the vehicle and put PID EXHTEMP2 and EXHTEMP3 each under the following conditions.

―  EXHTEMP2: 300 °C {572 °F} or more

―  EXHTEMP3: 500 °C {932 °F} or more

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Function Inspection Using M-MDS

STEP	INSPECTION		ACTION
1	PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY •  Verify related Service Information availability. •  Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. •  If the vehicle is not repaired, go to the next step.
		No	Go to the next step.
2	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA •  Is the DTC P0421:00 on FREEZE FRAME DATA?	Yes	Go to the next step.
		No	Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
3	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note •  Recording can be facilitated using the screen capture function of the PC. •  Record the FREEZE FRAME DATA/snapshot data on the repair order.	—	Go to the next step.
4	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. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) •  Is the other PENDING CODE/DTC also present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
		No	Go to the next step.
5	PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM AND DSC HU/CM •  Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) ―  EXHTEMP2 ―  EXHTEMP3 •  Is there any signal that is far out of specification?	Yes	Go to the next step.
		No	Go to the troubleshooting procedure to perform the procedure from Step 1.
6	PURPOSE: VERIFY CONNECTOR CONNECTIONS •  Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) Warning •  A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system. ―  EXHTEMP2 ―  EXHTEMP3 •  When the following parts are shaken, does the PID value include a PID item which has changed? ―  Exhaust gas temperature sensor No.2 ―  Exhaust gas temperature sensor No.3 ―  PCM	Yes	Inspect the related wiring harness and connector. •  Repair or replace the malfunctioning part. Go to the next step.
		No	Go to the troubleshooting procedure to perform the procedure from Step 1.
7	PURPOSE: VERIFY DIFFERENCE IN TEMPERATURE BEFORE AND AFTER PASSING CATALYTIC CONVERTER DURING COMPULSORY DIESEL PARTICULATE FILTER REGENERATION AND VERIFY IF CATALYTIC CONVERTER IS OPERATING NORMALLY AGAIN •  Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) ―  EXHTEMP2 ―  EXHTEMP3 •  Perform the "COMPULSORY DIESEL PARTICULATE FILTER REGENERATION". (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 2.2].) Note •  The implementation start time of compulsory diesel particulate filter regeneration indicates the condition in which the engine speed starts increasing. •  Is the difference in values between PID EXHTEMP2 and EXHTEMP3 50 °C {122 °F} or more after approx. 3 min from the implementation start time of compulsory diesel particulate filter regeneration?	Yes	Go to the troubleshooting procedure to perform the procedure from Step 1.
		No	Malfunction in the catalytic converter or the diesel particulate filter in the catalytic converter can be considered. Replace the catalytic converter, then go to the next step. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
8	PURPOSE: VERIFY DIFFERENCE IN TEMPERATURE BEFORE AND AFTER PASSING CATALYTIC CONVERTER DURING COMPULSORY DIESEL PARTICULATE FILTER REGENERATION AND VERIFY IF CATALYTIC CONVERTER IS OPERATING NORMALLY •  Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) ―  EXHTEMP2 ―  EXHTEMP3 •  Perform the "COMPULSORY DIESEL PARTICULATE FILTER REGENERATION". (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 2.2].) Note •  The implementation start time of compulsory diesel particulate filter regeneration indicates the condition in which the engine speed starts increasing. •  Is the difference in values between PID EXHTEMP2 and EXHTEMP3 50 °C {122 °F} or more after approx. 3 min from the implementation start time of compulsory diesel particulate filter regeneration?	Yes	Go to the troubleshooting procedure to perform the procedure from Step 1.
		No	Go to the troubleshooting procedure to perform the procedure from Step 6.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

•  Step 1

―  Perform inspection of exhaust gas leakage from exhaust system.

•  Step 2—4

―  Perform inspection of each separate part.

•  Step 5—7

―  Verify that the primary malfunction is resolved and there are no other malfunctions.

Function Inspection Using M-MDS