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 [12/2023 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

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

   HINT: 

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

Result: 

A 

GO TO DTC CHART. Refer To  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

Result: 

B 

See step  2

1. Read the value of Intake Manifold Absolute Pressure.

   Powertrain > Engine > Data List 

   Tester Display
   Intake Manifold Absolute Pressure

   Result

   Result	Proceed to
   The value of Intake Manifold Absolute Pressure is between 80 and 110 kPa(abs)	A
   None of the above conditions are met	B

   HINT: 

   80 to 110 kPa (11.6 to 15.95 psi).

Result: 

B 

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR. Refer to  REMOVAL [12/2023 - ] 

Result: 

A 

See step  3

Pre-procedure1

• Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).

  Powertrain > Hybrid Control > Utility 

  Tester Display
  Inspection Mode

• 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.

• 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

Post-procedure1

• None.

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 [12/2023 - ]

   OK

   No leaks from intake system.

   HINT: 

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

   Refer to INITIALIZATION [12/2023 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE INTAKE SYSTEM 

Result: 

OK 

See step  5

Pre-procedure1

• Remove the EGR valve assembly.

  HINT: 

  Refer to REMOVAL [12/2023 - ]

• Check if the EGR valve is stuck open.

  OK

  EGR valve is tightly closed.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPLACE EGR VALVE ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

HINT: 

Refer to REMOVAL [12/2023 - ]

Result

Result: 

NEXT 

See step  7

Pre-procedure1

• None.

• Clear the DTCs.

  Powertrain > Engine > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

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

Result: 

NEXT 

See step  8

Pre-procedure1

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

• Read the DTCs.

  Powertrain > Engine > Trouble Codes 

  Result

  Result	Proceed to
  DTCs are not output	A
  P0400-00, P0401-9C or P0402-9B is output	B

Post-procedure1

• None.

Result: 

A 

END 

Result: 

B 

See step  9

HINT: 

• Refer to REMOVAL [12/2023 - ]
• If any of the EGR system related pipes (EGR pipe, exhaust manifold, etc.) are cracked, damaged or clogged, replace them as necessary.

Result

Result: 

NEXT 

See step  10

Pre-procedure1

• None.

• Clear the DTCs.

  Powertrain > Engine > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

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

Result: 

NEXT 

See step  11

Pre-procedure1

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

• Read the DTCs.

  Powertrain > Engine > Trouble Codes 

  OK

  DTCs are not output.

  Result

  Proceed to
  NEXT

Post-procedure1

• None.

Result: 

NEXT 

END 

Pre-procedure1

• None.

• Clear the DTCs.

  Powertrain > Engine > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

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

Result: 

NEXT 

See step  13

Pre-procedure1

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

• Read the DTCs.

  Powertrain > Engine > Trouble Codes 

  Result

  Result	Proceed to
  DTCs are not output	A
  P0400-00, P0401-9C or P0402-9B is output	B

Post-procedure1

• None.

Result: 

A 

END 

Result: 

B 

REPLACE EGR VALVE ASSEMBLY. Refer to  REMOVAL [12/2023 - ]