Dtc P0400 Exhaust Gas Recirculation Flow


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE EGR VALVE CLOSE)

INSPECT VACUUM PUMP ASSEMBLY

CHECK VACUUM HOSE

INSPECT E-VRV FOR EGR

CHECK WIRE HARNESS (E-VRV FOR EGR - ECM)

CHECK WIRE HARNESS (E-VRV FOR EGR - INTEGRATION RELAY (MAIN RELAY))

INSPECT VSV FOR EGR CUT

CHECK HARNESS AND CONNECTOR (VSV FOR EGR CUT - ECM)

CHECK HARNESS AND CONNECTOR (VSV FOR EGR CUT - INTEGRATION RELAY (MAIN RELAY))

INSPECT EGR VALVE ASSEMBLY

REPLACE EGR VALVE ASSEMBLY

CHECK FOR BLOCKAGE IN EGR GAS PASSAGE (EXHAUST MANIFOLD - EGR VALVE ASSEMBLY)

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

CHECK WHETHER DTC OUTPUT RECURS

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0400 Exhaust Gas Recirculation Flow


DESCRIPTION

The EGR system recirculates exhaust gases, and adjusts the volume of the exhaust gases to the proper level depending on driving conditions. The recirculated gas mixes with the intake air, allowing the EGR system to slow down engine combustion and lower the combustion temperature. This helps reduce NOx emissions.
In order to increase circulation efficiency, the ECM adjusts the lift amount of the EGR valve and throttle valve.

DTC No.
DTC Detection Condition
Trouble Area
P0400
When either condition below is met:
  1. Mass air flow rate is not changed when turning on EGR valve assembly
    (1 trip detection logic)
  1. EGR valve assembly stuck
  2. EGR valve assembly does not move smoothly
  3. E-VRV for EGR (EGR valve assembly)
  4. VSV for EGR cut
  5. E-VRV for EGR circuit
  6. VSV for EGR cut circuit
  7. EGR blockage in line between exhaust manifold and intake manifold
  8. Mass air flow meter
  9. Intake system (leaks or blockages)
  10. Exhaust system (Exhaust gas leaks)
  11. ECM
HINT:
DTC detection is not performed for 4 seconds after the brake switch is turned ON and OFF.

MONITOR DESCRIPTION

  1. If the EGR valve assembly is forcibly operated but the intake air amount does not vary, the ECM determines that the EGR valve assembly is malfunctioning. The ECM then illuminates the MIL.
Flow malfunction
  1. If the EGR valve is forcibly operated during deceleration but the intake air amount does not vary, the ECM determines that the EGR valve is malfunctioning. The ECM then illuminates the MIL (2 trip detection logic).

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0400 Exhaust Gas Recirculation Flow


WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0400 Exhaust Gas Recirculation Flow


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
NOTICE:
After replacing the ECM, the new ECM needs registration (Toyota Fortuner RM0000012XK030X.html) and initialization (Toyota Fortuner RM0000012X2005X.html).
1.CHECK OTHER DTC OUTPUT

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC output)
    		Proceed to
    P0400
    		A
    P0400 and other DTCs
    		B
    HINT:
    If codes other than P0400 are output, perform troubleshooting for those DTCs first.


B
GO TO DTC CHART (Toyota Fortuner RM000002YV7010X.html)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE EGR VALVE CLOSE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and warm it up (engine coolant temperature is 70°C (158°F) or higher) with the A/C switch and all accessory switches off.

  1. Turn the ignition switch off. Wait for 30 seconds, and then restart the engine.

  1. Turn the tester on.

  1. Select the following menus: Powertrain / Engine and ECT / Data List / MAF.

  1. Read the MAF value displayed on the tester while the engine is idling.

  1. Select the following menus: Powertrain / Engine and ECT / Active Test / Activate the EGR Valve Close.

  1. Read the MAF value when the EGR valve is closed using the Active Test function.

    HINT:
    1. If idling continues for 15 minutes or more, the EGR valve target opening angle becomes 0% (EGR valve fully closed). As this makes diagnosis impossible, it becomes necessary to drive the vehicle or restart the engine.
    2. Before performing the diagnosis, confirm that the EGR valve target opening angle is not 0%.
    Result:
    Active Test
    		Result
    		Proceed to
    Activate the EGR Valve Close:
    Off (Open) to on (Closed)
    		MAF value does not change
    		A
    MAF value changes
    		B
    NOTICE:
    As the measured values may differ from those shown below due to factors such as differences in measuring environments and changes in vehicle condition due to aging, do not use these values to determine whether the vehicle is malfunctioning or not.
    HINT:
    The problem may be a temporary one, due to the entry of deposits or foreign matter. Check that there are no deposits or foreign matter in the E-VRV or mass air flow meter.
    Reference:
    EGR Valve Condition (Opening)
    		Measuring Condition
    		MAF (Reference)
    Open (55%)
    1. Atmosphere pressure: 101 kPa
    2. Intake air temperature: 30°C (86°F)
    3. Engine coolant temperature: 88°C (190°F)
    		3.0 to 9.0 gm/s
    Closed (0%)
    		15 to 22 gm/s


B
Go to step 11
A


3.INSPECT VACUUM PUMP ASSEMBLY

  1. Check the negative pressure of the vacuum pump.

    Standard:
    More than 86.7 kPa (650 mmHg, 26 in.Hg)


NG
REPLACE VACUUM PUMP ASSEMBLY
OK


4.CHECK VACUUM HOSE

  1. Check the vacuum hoses.

    OK:
    The hoses are not damaged and securely connected.


NG
REPLACE VACUUM HOSE
OK


5.INSPECT E-VRV FOR EGR

  1. Inspect the E-VRV (Toyota Fortuner RM000001418004X.html).



NG
REPLACE E-VRV FOR EGR
OK


6.CHECK WIRE HARNESS (E-VRV FOR EGR - ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0400 Exhaust Gas Recirculation Flow

  1. Disconnect the V1 E-VRV connector.

  1. Disconnect the E6 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E6-9 (EGR) - V1-2
    		Below 1 Ω
    E6-9 (EGR) or V1-2 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK WIRE HARNESS (E-VRV FOR EGR - INTEGRATION RELAY (MAIN RELAY))
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0400 Exhaust Gas Recirculation Flow

  1. Remove the integration relay from the engine room junction block.

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the V1 E-VRV connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-5 - V1-1
    		Below 1 Ω
    1J-5 or V1-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT VSV FOR EGR CUT

  1. Inspect the VSV for EGR cut (Toyota Fortuner RM000001415007X.html).



NG
REPLACE VSV FOR EGR CUT
OK


9.CHECK HARNESS AND CONNECTOR (VSV FOR EGR CUT - ECM)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0400 Exhaust Gas Recirculation Flow

  1. Disconnect the V2 VSV for EGR Cut connector.

  1. Disconnect the E6 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E6-18 (EGRC) - V2-2
    		Below 1 Ω
    E6-18 (EGRC) or V2-2 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.CHECK HARNESS AND CONNECTOR (VSV FOR EGR CUT - INTEGRATION RELAY (MAIN RELAY))


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0400 Exhaust Gas Recirculation Flow

  1. Remove the integration relay from the engine room junction block.

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the V2 VSV for EGR Cut connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-5 - V2-1
    		Below 1 Ω
    1J-5 or V2-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.INSPECT EGR VALVE ASSEMBLY

  1. Inspect the EGR valve assembly (Toyota Fortuner RM000001418004X.html).

    HINT:
    1. If there are any deposits adhering to the valve, clean the valve.
    2. When inspecting the EGR valve, make sure that the valve is fully closed.


OK
Go to step 13

NG
Go to step 12

12.REPLACE EGR VALVE ASSEMBLY

  1. Replace the EGR valve assembly (Toyota Fortuner RM00000141A004X.html).


NEXT


13.CHECK FOR BLOCKAGE IN EGR GAS PASSAGE (EXHAUST MANIFOLD - EGR VALVE ASSEMBLY)

  1. Check for blockage in the EGR gas passage between the exhaust manifold and EGR valve assembly.

    OK:
    No blockage in the EGR gas passage
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 15
A


14.REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

  1. Repair or replace the malfunctioning parts, component and area.


NEXT


15.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F).

  1. Move the shift lever to 2nd gear and decelerate from a speed of 50 km/h (31 mph) or more (fully closing the accelerator for approximately 5 seconds or more).

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read the DTC.

    Result
    Display (DTC Output)
    		Proceed to
    P0400
    		A
    No output
    		B


B
END
A


16.REPLACE ECM

  1. Replace the ECM (Toyota Fortuner RM0000013Z0004X.html).


NEXT


17.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F).

  1. Move the shift lever to 2nd gear and decelerate from a speed of 50 km/h (31 mph) or more (fully closing the accelerator for approximately 5 seconds or more).

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.

    HINT:
    If the DTC is output again, the mass air flow meter may be malfunctioning.

NEXT

END