Dtc P0400 Exhaust Gas Recirculation Flow

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0400, P1248)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

READ VALUE USING INTELLIGENT TESTER (EGR VALVE LEARNING VALUE)

CHECK FOR DEPOSIT (EGR PASSAGE)

CHECK FOR EXHAUST GAS LEAKS

INSPECT EGR VALVE ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM)

REPLACE EGR VALVE ASSEMBLY (No. 1 or No. 2)

CHECK WHETHER DTC OUTPUT RECURS

REMOVE FOREIGN OBJECT AND CLEAN EGR VALVE (No. 1 or No. 2)

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

REPAIR EXHAUST GAS LEAKAGE POINT

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EGR VALVE CONNECTOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0400 Exhaust Gas Recirculation Flow

DTC P1248 Exhaust Gas Recirculation Flow Bank 2

DESCRIPTION

The EGR system recirculates exhaust gases. The recirculated gas mingles with the intake air so that 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 the throttle valve angle.

P0400 (No. 1 EGR valve malfunction)
DTC Detection Drive PatternDTC Detection ConditionTrouble Area
After warming up engine and idling for 60 seconds, maintain engine speed at 2500 rpm for 40 seconds, drive vehicle and perform engine break deceleration by fully closing accelerator when engine speed is 2000 rpm or moreThe target and actual positions of the No. 1 EGR valve assembly are different for 30 seconds or more (1 trip detection logic).
EGR valve stuck
EGR valve does not move smoothly
Open or short in EGR valve circuit
EGR valve deposit
EGR valve passage
ECM
P1248 (No. 2 EGR valve malfunction)
DTC Detection Drive PatternDTC Detection ConditionTrouble Area
After warming up engine and idling for 60 seconds, maintain engine speed at 2500 rpm for 40 seconds, drive vehicle and perform engine break deceleration by fully closing accelerator when engine speed is 2000 rpm or moreThe target and actual positions of the No. 1 EGR valve assembly are different for 30 seconds or more (1 trip detection logic).
EGR valve stuck
EGR valve does not move smoothly
Open or short in EGR valve circuit
EGR valve deposit
EGR valve passage
ECM
P0400 (Flow malfunction)
DTC Detection Drive PatternDTC Detection ConditionTrouble Area
Decelerate from a speed of 50 km/h (80 mph) or more (release accelerator pedal for approximately 5 seconds)Mass air flow rate is not changed when turning on the electric EGR control valve while decelerating (2 trip detection logic).
EGR valve stuck
EGR valve does not move smoothly
Open or short in EGR valve circuit
EGR valve deposit
EGR valve passage
ECM
Related Data List
DTC No.Data List
P0400
(No. 1 EGR valve malfunction)
MAF
MAP
Actual EGR Valve Pos.
Actual EGR Valve Pos. #2
Target EGR Valve Pos.
Target EGR Valve Pos. #2
EGR Close Lrn. Val.
EGR Close Lrn. Val. #2
EGR Close Learn Val.
EGR Close Lrn. Val. #2
EGR Close Lrn. Status
EGR Close Lrn. Status #2
EGR Lift Sensor Volt %
EGR Lift Sensor Volt % #2
EGR Motor Duty #1
EGR Motor Duty #2
P1248
(No. 2 EGR valve malfunction)
P0400
(Flow malfunction)
  • HINT:
  • If DTC P0400 and/or P1238 is stored, the following symptoms may appear:
Stuck closed malfunction
Intake booming noise
Slight combustion noise
Stuck open malfunction
Black smoke
Lack of power
Vibration at engine stop
Hesitation

MONITOR DESCRIPTION

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

WIRING DIAGRAM

Dtc P0400 Exhaust Gas Recirculation Flow. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
  • After replacing the ECM, the new ECM needs registration () and initialization ().
  • HINT:
The Data List item Actual EGR Valve Pos. changes to follow Target EGR Position. When the ignition switch is ON (engine stopped), the EGR valve is fully closed (Actual EGR Valve Pos. = 0), and when idling, the EGR valve is open partway (neither fully closed nor fully open).
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are 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.
1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0400, P1248)

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Powertrain / Engine / DTC.

Read the DTCs.

Result
ResultProceed to
P0400 and/or P1248 are outputA
P0400, P1248 and other DTCs are outputB
  • HINT:
  • If codes other than P0400 and P1248 are output, perform troubleshooting for those DTCs first.
B
GO TO DTC CHART ()
A
2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position or Control the EGR Step Position #2 / Data List / Actual EGR Valve Pos. or Actual EGR Valve Pos. #2.

When changing the Active Test value from 0 to 100%, check that Actual EGR Valve Pos. or Actual EGR Valve Pos. #2 smoothly changes to the set opening angle.

  • OK:
  • Value smoothly changes to within +/-10% of set opening angle.
  • HINT:
EGR valve closed: Actual EGR Valve Pos. is 0%
EGR valve open: Actual EGR Valve Pos. is 94.9%
NG
Go to step 6
OK
3.READ VALUE USING INTELLIGENT TESTER (EGR VALVE LEARNING VALUE)

Connect the intelligent tester to the DLC3.

Turn the ignition switch from ON to off, and wait 5 seconds. Then turn the ignition switch to ON and the tester on.

Enter the following menus: Powertrain / Engine / Data List / EGR Close Learn Val. or EGR Close Lrn. Val. #2, and EGR Lift Sensor Volt % or EGR Lift Sensor Volt % #2.

Check the value.

  • OK:
  • Tester DisplayStandard value
    EGR Close Learn Val.3.5 to 4.5 V
    EGR Close Lrn. Val. #23.5 to 4.5 V
    EGR Lift Sensor Volt %70 to 90%
    EGR Lift Sensor Volt % #270 to 90%
  • HINT:
When EGR Close Lrn. Status is OFF (learning is incomplete) or EGR Close Lrn. Value is 3.5 V (lower limit), there is foreign matter stuck in the valve.
The median value of EGR Close Lrn. Value is 4.0 V.
NG
Go to step 10
OK
4.CHECK FOR DEPOSIT (EGR PASSAGE)

Check for any deposits.

  • OK:
  • No deposits.
NG
Go to step 11
OK
5.CHECK FOR EXHAUST GAS LEAKS

Check for exhaust gas leaks.

  • OK:
  • No leaks.
OK
Go to step 9
NG
Go to step 12
6.INSPECT EGR VALVE ASSEMBLY (POWER SOURCE)
Dtc P0400 Exhaust Gas Recirculation Flow. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the EGR valve connector.

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

  • Standard Voltage:
  • No. 1
    Tester ConnectionSwitch ConditionSpecified Condition
    C87-1 (+B) - Body groundIgnition switch ON11 to 14 V
  • No. 2
    Tester ConnectionSwitch ConditionSpecified Condition
    C88-1 (+B) - Body groundIgnition switch ON11 to 14 V
NG
Go to step 13
OK
7.CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM)
Dtc P0400 Exhaust Gas Recirculation Flow. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the EGR valve connector.

Disconnect the ECM connector.

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

  • Standard Resistance (Check for Open):
  • No. 1 (LHD)
    Tester ConnectionConditionSpecified Condition
    C87-5 (EGR) - C45-107 (EGRS)AlwaysBelow 1 Ω
  • No. 2 (LHD)
    Tester ConnectionConditionSpecified Condition
    C88-5 (EGR) - C45-108 (ERS2)AlwaysBelow 1 Ω
  • No. 1 (RHD)
    Tester ConnectionConditionSpecified Condition
    C87-5 (EGR) - C46-107 (EGRS)AlwaysBelow 1 Ω
  • No. 2 (RHD)
    Tester ConnectionConditionSpecified Condition
    C88-5 (EGR) - C46-108 (ERS2)AlwaysBelow 1 Ω
  • Standard Resistance (Check for Short):
  • No. 1 (LHD)
    Tester ConnectionConditionSpecified Condition
    C87-5 (EGR) or C45-107 (EGRS) - Body groundAlways10 kΩ or higher
  • No. 2 (LHD)
    Tester ConnectionConditionSpecified Condition
    C88-5 (EGR) or C45-108 (ERS2) - Body groundAlways10 kΩ or higher
  • No. 1 (RHD)
    Tester ConnectionConditionSpecified Condition
    C87-5 (EGR) or C46-107 (EGRS) - Body groundAlways10 kΩ or higher
  • No. 2 (RHD)
    Tester ConnectionConditionSpecified Condition
    C88-5 (EGR) or C46-108 (ERS2) - Body groundAlways10 kΩ or higher
NG
Go to step 14
OK
8.REPLACE EGR VALVE ASSEMBLY (No. 1 or No. 2)

Replace the EGR valve assembly (No. 1 or No. 2) ().

NEXT
9.CHECK WHETHER DTC OUTPUT RECURS

Clear the DTCs ().

Connect the intelligent tester to the DLC3.

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

Start the engine and warm it up.

Switch the ECM from normal mode to check mode using the tester ().

After warming up the engine and idling for 60 seconds, maintain the engine speed at 2500 rpm for 40 seconds, decelerate from a speed of 50 km/h (80 mph) or more (release accelerator pedal for approximately 5 seconds).

Confirm that the DTC is not output again.

  • HINT:
  • Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Input DTC P0400 and/or P1248.

Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, after warming up the engine and idling for 60 seconds, maintain the engine speed at 2500 rpm for 40 seconds, decelerate from a speed of 50 km/h (80 mph) or more (release accelerator pedal for approximately 5 seconds).

Result
ResultProceed to
NORMAL A
ABNORMALB
A
END
B
Go to step 15
10.REMOVE FOREIGN OBJECT AND CLEAN EGR VALVE (No. 1 or No. 2)
NEXT
Go to step 16
11.REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
NEXT
Go to step 16
12.REPAIR EXHAUST GAS LEAKAGE POINT
NEXT
Go to step 16
13.REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EGR VALVE CONNECTOR)
NEXT
Go to step 16
14.REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT
Go to step 16
15.REPLACE ECM

Replace the ECM ().

NEXT
16.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs ().

Turn the ignition switch off.

Start the engine.

After warming up the engine and idling for 60 seconds, maintain the engine speed at 2500 rpm for 40 seconds, decelerate from a speed of 50 km/h (80 mph) or more (release accelerator pedal for approximately 5 seconds).

Confirm that the DTC is not output again.

  • HINT:
  • Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Input DTC P0400 and/or P1248.

Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, after warming up the engine and idling for 60 seconds, maintain the engine speed at 2500 rpm for 40 seconds, decelerate from a speed of 50 km/h (80 mph) or more (release accelerator pedal for approximately 5 seconds).

NEXT
END