DTC P0403-18: Exhaust Gas Recirculation "A" Circuit Current Below Threshold; DTC P0403-19: Exhaust Gas Recirculation "A" Circuit Current Above Threshold; DTC P1400-18: Exhaust Gas Recirculation "A" Control Circuit 2 Circuit Current Below Threshold; DTC P1400-19: Exhaust Gas Recirculation "A" Control Circuit 2 Circuit Current Above Threshold [12/2019 - 10/2022]: Procedure

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

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

   HINT: 

   The A/C switch and all accessory switches should be off.

2. Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure 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.

   OK

   The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

   Standard

   -	Control the EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   Intake Manifold Absolute Pressure (Data List)	(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

   Proceed to
   OK
   NG

Result: 

OK 

CHECK FOR INTERMITTENT PROBLEMS 

Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - ]

Result: 

NG 

See step  2

Refer to INSPECTION [12/2019 - ]

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: 

NG 

REPLACE EGR VALVE ASSEMBLY 

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

Result: 

OK 

See step  3

1. Disconnect the EGR valve assembly connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C44-1 (EGA+) - C55-3 (EGA+)	Always	Below 1 Ω
   C44-2 (EGA-) - C55-4 (EGA-)	Always	Below 1 Ω
   C44-4 (EGB+) - C55-6 (EGB+)	Always	Below 1 Ω
   C44-3 (EGB-) - C55-5 (EGB-)	Always	Below 1 Ω
   C44-1 (EGA+) or C55-3 (EGA+) - Body ground and other terminals	Always	10 kΩ or higher
   C44-2 (EGA-) or C55-4 (EGA-) - Body ground and other terminals	Always	10 kΩ or higher
   C44-4 (EGB+) or C55-6 (EGB+) - Body ground and other terminals	Always	10 kΩ or higher
   C44-3 (EGB-) or C55-5 (EGB-) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM 

Refer to REMOVAL [12/2019 - 10/2022]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR