RM38N0EC _51 Engine / Hybrid System _111785 M20C-FKS, M20D-FKS ENGINE CONTROL _0504416 SFI SYSTEM C

M20C-FKS, M20D-FKS ENGINE CONTROL  SFI SYSTEM  P04019C  Exhaust Gas Recirculation "A" Low / Insufficient Flow  


DESCRIPTION

Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to each engine cylinder in order to lower the combustion temperature and reduce NOx emissions. The ECM monitors signals such as engine speed, engine coolant temperature, electric load, and vehicle speed. When the EGR permission conditions are met, the ECM controls the opening of the EGR valve linearly through signals to the EGR step motor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
P04019C Exhaust Gas Recirculation "A" Low / Insufficient Flow Change in intake manifold pressure is small when the EGR valve opened and closed during fuel cut operation (2 trip detection logic).
·

EGR valve assembly

·

EGR passage

·

EGR cooler assembly

·

Intake system

·

Manifold absolute pressure sensor


Comes on SAE Code: P0401

MONITOR DESCRIPTION

The ECM monitors the pressure inside the intake manifold while opening and closing the EGR valve during fuel cut operation. If there is no change in the manifold absolute pressure sensor value, the ECM interprets this as a malfunction of the EGR valve assembly, illuminates the MIL and stores this DTC.

CONFIRMATION DRIVING PATTERN

HINT:
·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



A410431E04
5.344,3.281 4.781,2.854 false 3.604,3.208 4,2.844 false 5.344,3.271 5.604,2.865 false 5.344,3.271 6.406,2.875 false 4.75,1.49 4.958,0.604 4.958,0.604 5.094,0.604 false 0.604,3.125 0.604,2.625 0.604,2.625 0.865,2.479 false 0.083,0.094 2.073,0.292 1.99,0.198 10 false Vehicle Speed 0.333,0.948 2.323,1.146 1.99,0.198 10 false 80 km/h 0.333,1.156 2.323,1.354 1.99,0.198 10 false 60 km/h 0.5,2.156 2.49,2.354 1.99,0.198 10 false Idling 0.177,3.135 1.083,3.563 0.906,0.427 10 false Ignition switch ON 1.375,2.958 2.573,3.281 1.198,0.323 10 false Warming up 2.344,2.979 3.552,3.229 1.208,0.25 10 false 5 minutes or more 2.865,3.24 4.406,3.5 1.542,0.26 10 false 30 seconds or more 4.823,3.333 6.031,3.583 1.208,0.25 10 false 5 minutes or more 1.615,2.042 2.01,2.281 0.396,0.24 10 false [A] 2.75,1.031 3.146,1.271 0.396,0.24 10 false [B] 3.927,2.031 4.323,2.271 0.396,0.24 10 false [C] 4.458,0.823 4.708,1.063 0.25,0.24 10 false [D] 5.271,0.833 5.521,1.073 0.25,0.24 10 false [D] 6.073,0.833 6.323,1.073 0.25,0.24 10 false [D] 4.833,1.469 5.083,1.708 0.25,0.24 10 false [E] 5.656,1.469 5.906,1.708 0.25,0.24 10 false [E] 6.458,1.469 6.708,1.708 0.25,0.24 10 false [E] 6.844,2.75 7.156,2.938 0.313,0.188 10 false Time 6.74,3.375 6.99,3.615 0.25,0.24 10 false [F] 5.156,0.51 5.76,0.719 0.604,0.208 10 false Fuel cut

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

5.

Turn the ignition switch off and wait for at least 30 seconds.

6.

Turn the ignition switch to ON.

7.

Turn the GTS on.

8.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].

9.

Drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more [B].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


10.

Idle the engine for 30 seconds or more [C].

11.

With the shift lever in M or 2nd gear, accelerate the vehicle to 80 km/h (50 mph) or more [D].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


12.

Perform the fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E].

13.

Repeat steps [D] through [E] above 3 times in one driving cycle.

14.

Enter the following menus: Powertrain / Engine / Trouble Codes [F].

15.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



16.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

17.

Input the DTC P04019C.

18.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions



HINT:
·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

If the judgment result is INCOMPLETE, perform steps [D] through [F] again.

·

[A] to [F]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




CAUTION / NOTICE / HINT

HINT:
·

By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.

·

When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it is opened using the Active Test, the Data List value changes as follows.

Data List Item Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test
Engine Speed Idle becomes rough
Intake Manifold Absolute Pressure Pressure rises

·

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.



PROCEDURE

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P04019C)
a.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTC P04019C is output A
DTC P04019C and other DTCs are output B


HINT:

If any DTCs other than P04019C are output, troubleshoot those DTCs first.




A

2.READ VALUE USING GTS (INTAKE MANIFOLD ABSOLUTE PRESSURE)

B

GO TO DTC CHART

2.READ VALUE USING GTS (INTAKE MANIFOLD ABSOLUTE PRESSURE)
a.

Read the value of Intake Manifold Absolute Pressure.

Powertrain > Engine > Data List
Tester Display
Intake Manifold Absolute Pressure
50003 372 385
Standard:
GTS Display Specified Condition
Intake Manifold Absolute Pressure 80 to 110 kPa (11.6 to 15.95 psi)



Result:
Proceed to
OK
NG



OK

3.PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

NG

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (EMISSION CONTROL)>VACUUM SENSOR>REMOVAL


3.PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)
a.

Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.


Powertrain > Engine > Data List
Tester Display
Coolant Temperature
50003 372 205

b.

According to the display on the GTS, compare the values of Data List item Intake Manifold Absolute Pressure before and while performing the Active Test.

Powertrain > Engine > Active Test
Active Test Display
Control the EGR Step Position
Data List Display
Intake Manifold Absolute Pressure
50004 372 25 385
NOTICE:
·

Do not leave the EGR valve open for 10 seconds or more during the Active Test.

·

Be sure to return the EGR valve to step 0 when the Active Test is completed.

·

Do not open the EGR valve 30 steps or more during the Active Test.



Standard:

The value of Intake Manifold Absolute Pressure changes according to the EGR valve step set by the Active Test.

Data List Control the EGR Step Position (Active Test)
Before Active Test
(Engine idling) 		0 Steps 0 to 30 Steps
(Engine idling)
Intake Manifold Absolute Pressure 18 to 38 kPa (2.6 to 5.5 psi) 18 to 38 kPa (2.6 to 5.5 psi)
(EGR valve is fully closed) 		Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed


HINT:

While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.


Result:
Result Proceed to
Before performing the Active Test (while the engine is idling), the value of Intake Manifold Absolute Pressure is not between 18 to 38 kPa (2.6 to 5.5 psi). A
When performing the Active Test to change the EGR valve step between 0 (EGR valve fully closed) and 30, the value of Intake Manifold Absolute Pressure changes less than 10 kPa (1.42 psi). B
Other than above C




A

4.CHECK INTAKE SYSTEM

B

6.REPLACE EGR VALVE ASSEMBLY

C

12.CLEAR DTC
4.CHECK INTAKE SYSTEM
a.

Check the intake system for vacuum leaks.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (INTAKE / EXHAUST)>INTAKE SYSTEM>ON-VEHICLE INSPECTION

OK:

No leaks from intake system.


HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

5.INSPECT EGR VALVE ASSEMBLY

NG

REPAIR OR REPLACE INTAKE SYSTEM

7.CLEAR DTC
a.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

b.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

8.CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)
8.CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)
a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


b.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTCs are not output A
DTC P04019C is output B




A

END

B

9.REPLACE EGR COOLER ASSEMBLY
10.CLEAR DTC
a.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

b.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

11.CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)
11.CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)
a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


b.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
OK:

DTCs are not output.



Result:
Proceed to
NEXT



NEXT

END

12.CLEAR DTC
a.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

b.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

13.CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)
13.CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)
a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


b.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTCs are not output A
DTC P04019C is output B



HINT:

Perform "Inspection After Repair" after replacing the EGR valve assembly.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



A

END

B

REPLACE EGR VALVE ASSEMBLY

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (EMISSION CONTROL)>EGR VALVE>REMOVAL