DTC P0400-00: Exhaust Gas Recirculation "A" Flow; DTC P0401-9C: Exhaust Gas Recirculation "A" Low / Insufficient Flow; DTC P0402-9B: Exhaust Gas Recirculation "A" High/Excessive Flow [12/2019 - 10/2022]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P0400-00, P0401-9C or P0402-9B is output	A
   DTC P0400-00, P0401-9C or P0402-9B and other DTCs are output	B

   HINT: 

   If any DTCs other than P0400-00, P0401-9C or P0402-9B are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART  . Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 09/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 10/2022]

Result: 

A 

See step  2

1. Read the value of Intake Manifold Absolute Pressure.

   Powertrain > Engine > Data List 

   Tester Display
   Intake Manifold Absolute Pressure

   Standard

   GTS Display	Specified Condition
   Intake Manifold Absolute Pressure	80 to 110 kPa (11.6 to 15.95 psi)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR 

Refer to REMOVAL [12/2019 - ]

Result: 

OK 

See step  3

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

   HINT: 

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

3. 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
   Engine Independent

   NOTE:

   • Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
   • 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	20 to 40 kPa (2.9 to 5.8 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: 

   • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
   • 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.
   • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

   Result

   Result	Proceed to
   Before performing the Active Test (while the engine is idling), the value of Intake Manifold Absolute Pressure is not between 20 to 40 kPa (2.9 to 5.8 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 (1.45 psi).	B
   Other than above	C

Result: 

B 

See step  6

Result: 

C 

See step  12

Result: 

A 

See step  4

1. Check the intake system for vacuum leaks.

   Refer to ON-VEHICLE INSPECTION [12/2019 - ]

   OK

   No leaks from intake system.

   HINT: 

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

   Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE INTAKE SYSTEM 

Result: 

OK 

See step  5

1. Remove the EGR valve assembly.

   Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022]

2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

   HINT: 

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

   Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR 

Refer to REMOVAL [12/2019 - ]

Result: 

NG 

REPLACE EGR VALVE ASSEMBLY 

Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022]

Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022]

HINT: 

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

Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - ]

Result

Result: 

NEXT 

See step  7

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
2. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P0400-00, P0401-9C or P0402-9B.

   Result

   Result	Proceed to
   NORMAL (DTCs are not output)	A
   ABNORMAL (DTC P0400-00, P0401-9C or P0402-9B is output)	B

Result: 

A 

END 

Result: 

B 

See step  9

Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022]

HINT: 

• If any of the EGR system related pipes (EGR pipe, exhaust manifold, etc.) are cracked, damaged or clogged, replace them as necessary.
• Perform "Inspection After Repair" after replacing the EGR system.

  Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - ]

Result

Result: 

NEXT 

See step  10

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
2. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

   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

3. Input the DTC: P0400-00, P0401-9C or P0402-9B.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  13

1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
2. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P0400-00, P0401-9C or P0402-9B.

   Result

   Result	Proceed to
   NORMAL (DTCs are not output)	A
   ABNORMAL (DTC P0400-00, P0401-9C or P0402-9B is output)	B

   HINT: 

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

   Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - ]

Result: 

A 

END 

Result: 

B 

REPLACE EGR VALVE ASSEMBLY 

Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022]