DTC    P0400    Exhaust Gas Recirculation Flow

для подготовки Нажмите здесь


DESCRIPTION

The EGR system recirculates exhaust gases, in order to suit every driving condition. The recirculated gas mingles with the intake air, therefore the EGR system can slow combustion speed and keep the combustion temperature down. This helps reduce NOx emissions.
In order to increase EGR circulation efficiency, the ECM adjusts the lift amount of the EGR valve and intake shutter valve angle (throttle valve).

DTC No.
DTC Detection Condition
Trouble Area
P0400
When either condition below is met:
  1. Target and actual positions of the EGR valve is different (1-trip detection logic)
  2. Mass air flow rate is not changed when turning on EGR valve (1-trip detection logic)
  1. EGR valve stuck
  2. EGR valve does not move smoothly
  3. Open or short in EGR valve circuit
  4. Open or short in EGR valve position sensor circuit
  5. EGR valve position sensor
  6. ECM

MONITOR DESCRIPTION

  1. If the EGR valve is forcibly operated but the intake air amount does not vary, the ECM determines that the EGR valve is malfunctioning. The ECM then illuminates the MIL.
  2. When the target and actual positions of the EGR valve are different, the ECM interprets this as a malfunction of the EGR valve and illuminates the MIL.

C129060E02


WIRING DIAGRAM


A160299E01


INSPECTION PROCEDURE

ПРИМЕЧАНИЕ:
After replacing the ECM, the new ECM needs registration (See page Нажмите здесь) and initialization (See page Нажмите здесь).

УКАЗАНИЕ:
  1. After warming up the engine, DTC P0400 can be set if 1 second or more passes after quickly accelerating the engine from idling.
  2. Read freeze frame data using the intelligent tester. 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, and other data from the time the malfunction occurred.

1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0400)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester on.

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

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    DTC P0400 is output
    		A
    DTC P0400 and P0405 and/or P0406 are output
    		B

    УКАЗАНИЕ:
    If codes other than P0400 are output, perform troubleshooting for those DTCs first.



B
GO TO DTC CHART (Нажмите здесь)
A


2.READ VALUE OF INTELLIGENT TESTER (EGR POSITION)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / EGR Position.

  1. Read the value.

    Result:

    Condition
    		Result
    		Proceed to
    After warming up the engine, quickly accelerate the engine from idling to 3000 rpm by using the accelerator pedal
    		Constant or changes slowly
    		A
    Smooth changes from approximately 0% to approximately 50%
    		B

    УКАЗАНИЕ:
    1. EGR valve closed: EGR position is 0%
    2. EGR valve open: EGR position is 65%



B
CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)
A


3.INSPECT EGR VALVE ASSEMBLY (EGR VALVE POSITION SENSOR RESISTANCE)


    A160884E01

  1. Disconnect the EGR valve position sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    5 (EGRS) - 1 (+B)
    		20°C (68°F)
    		Approximately 6.5 to 7.5 Ω

  1. Reconnect the EGR valve position sensor connector.



NG
REPLACE EGR VALVE ASSEMBLY (Нажмите здесь)
OK


4.CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM)


    A160862E04

  1. Disconnect the EGR valve position sensor connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    B51-5 (EGRS) - B31-85 (EGRS)
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    B51-5 (EGRS) or B31-85 (EGRS) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the EGR valve position sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (EGR VALVE ASSEMBLY - ECM)
OK


5.INSPECT FUSE (EFI NO. 2 FUSE)


    A160312E01

  1. Remove the EFI No. 2 fuse from the engine room relay block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    EFI No. 2 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the EFI No. 2 fuse.



NG
REPLACE FUSE
OK


6.CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - EFI MAIN RELAY)


    A142930E02

  1. Check the wire harness between the EGR valve position sensor and EFI MAIN relay.

    1. Disconnect the EGR valve position sensor connector.

    2. Remove the integration relay from the engine room relay block.

    3. Disconnect the integration relay connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open):
      Tester Connection
      		Condition
      		Specified Condition
      B51-1 (+B) - 1B-4
      		Always
      		Below 1 Ω

      Standard resistance (Check for short):
      Tester Connection
      		Condition
      		Specified Condition
      B51-1 (+B) or 1B-4 - Body ground
      		Always
      		10 kΩ or higher

    5. Reconnect the EGR valve position sensor connector.

    6. Reconnect the integration relay connector.

    7. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (EGR VALVE ASSEMBLY - EFI MAIN RELAY)
OK


7.REPLACE EGR VALVE ASSEMBLY

  1. Replace the EGR valve position sensor (See page Нажмите здесь).


NEXT


8.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester on.

  1. Clear the DTCs (See page Нажмите здесь).

  1. Start the engine and drive the vehicle for approximately 15 minutes.

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

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    DTC P0400 is output
    		A
    DTC is not output
    		B



B
SYSTEM IS OK
A

REPLACE ECM (Нажмите здесь)  

































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