Dtc P0489 Exhaust Gas Recirculation Control Circuit Low


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ELECTRIC VACUUM REGULATING VALVE ASSEMBLY

CHECK TERMINAL VOLTAGE (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (ELECTRIC VACUUM REGULATING VALVE ASSEMBLY - ECM)

REPLACE ECM

REPLACE ELECTRIC VACUUM REGULATING VALVE ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0489 Exhaust Gas Recirculation Control Circuit Low

DTC P0490 Exhaust Gas Recirculation Control Circuit High


DESCRIPTION

The EGR system recirculates exhaust gases in a way that suits every driving condition. The recirculated gas mixes with intake air. Therefore, the EGR system can slow combustion speed and keep the combustion temperature down. This helps reduce NOx emission.
In order to increase EGR circulation efficiency, the ECM adjusts the lift amount of the EGR valve and the throttle valve angle.

P0489
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
5 seconds after engine is started
Open or short in electric vacuum regulating valve assembly circuit for 5 seconds or more (1 trip detection logic).
  1. Electric vacuum regulating valve assembly
  2. Open or short in electric vacuum regulating valve assembly circuit
  3. ECM

P0490
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
5 seconds after engine is started
Open or short in electric vacuum regulating valve assembly circuit for 5 seconds or more (1 trip detection logic).
  1. Electric vacuum regulating valve assembly
  2. Open or short in electric vacuum regulating valve assembly circuit
  3. ECM

Related Data List
DTC No.
Data List
P0489
  1. Actual EGR Valve Pos.
  2. Target EGR Position
P0490

WIRING DIAGRAM

Refer to DTC P0400 (LandCruiser RM0000041P806FX_03.html).

INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
1.INSPECT ELECTRIC VACUUM REGULATING VALVE ASSEMBLY

  1. Inspect the electric vacuum regulating valve assembly (LandCruiser RM000002RK7022X.html).



NG
Go to step 5
OK


2.CHECK TERMINAL VOLTAGE (POWER SOURCE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. Dtc P0489 Exhaust Gas Recirculation Control Circuit Low

  1. Disconnect the electric vacuum regulating valve assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C76-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to electric vacuum regulating valve assembly)

  1. Reconnect the electric vacuum regulating valve assembly connector.



NG
Go to step 6
OK


3.CHECK HARNESS AND CONNECTOR (ELECTRIC VACUUM REGULATING VALVE ASSEMBLY - ECM)

  1. Disconnect the electric vacuum regulating valve assembly 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
    C76-2 - C93-9 (EGR)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C76-2 or C93-9 (EGR) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the electric vacuum regulating valve assembly connector.

  1. Reconnect the ECM connector.



NG
Go to step 6
OK


4.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002CX.html).



NEXT
Go to step 7

5.REPLACE ELECTRIC VACUUM REGULATING VALVE ASSEMBLY

  1. Replace the electric vacuum regulating valve assembly (LandCruiser RM000002RK903UX.html).



NEXT
Go to step 7

6.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.

    HINT:
    If the voltage at the electric vacuum regulating valve assembly connector is not 11 to 14 V, repair or replace the harness and connector between the electric vacuum regulating valve assembly and the EFI relay (including the EFI No. 2 fuse).

NEXT


7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Turn the ignition switch off for 30 seconds or more.

  1. Start the engine.

  1. Idle the engine for 5 seconds or more.

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

  1. Confirm that the DTC is not output again.


NEXT

END