Dtc P0489 Exhaust Gas Recirculation Control Circuit Low


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY

CHECK HARNESS AND CONNECTOR (ELECTRIC EGR VALVE ASSEMBLY - ECM)

REPLACE ECM

REPLACE ELECTRIC EGR 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 actuator is operated by the ECM and opens and closes the EGR valve using gears. The opening angle of the EGR valve is detected by the EGR position sensor, which is mounted on the electric EGR control valve assembly.

P0489
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Idle the engine for 5 seconds or more
Both of the following conditions are met for 2.0 seconds:
(1 trip detection logic)
  1. The EGR actuator duty cycle is 80% or higher.
  2. EGR actuator current is below 0.5 A.
  1. Open or short in EGR actuator circuit
  2. Electric EGR control valve assembly
  3. ECM

P0490
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Idle the engine for 5 seconds or more
An EGR actuator current of 8 A or higher or the ECM internal circuit temperature of 150 to 160°C (302 to 320°F) or higher is detected.
(1 trip detection logic)
  1. Open or short in EGR actuator circuit
  2. Electric EGR control valve assembly
  3. ECM

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

WIRING DIAGRAM

Refer to DTC P042E (LandCruiser RM000004KMK023X_03.html).

INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AUX.html) and initialization (LandCruiser RM000000TIN08HX.html).
HINT:
Read freeze frame data using the GTS. 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.INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY

  1. Remove the electric EGR control valve assembly (LandCruiser RM000005UJR000X.html).



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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    5 (M-) - 4 (M+)
    		Always
    		No short or open circuit
    Text in Illustration
    *a
    		Component without harness connected
    (Electric EGR Control Valve Assembly)


NG
Go to step 4
OK


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

  1. Disconnect the electric EGR valve assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C127-4 (M+) - C151-6 (EGM+)
    		Always
    		Below 1 Ω
    C127-5 (M-) - C151-7 (EGM-)
    		Always
    		Below 1 Ω
    C127-4 (M+) or C151-6 (EGM+) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    C127-5 (M-) or C151-7 (EGM-) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the electric EGR valve assembly connector.

  1. Reconnect the ECM connector.



NG
Go to step 5
OK


3.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002DX.html).



NEXT
Go to step 6

4.REPLACE ELECTRIC EGR VALVE ASSEMBLY

  1. Replace the electric EGR valve assembly (LandCruiser RM000005UJR000X.html).



NEXT
Go to step 6

5.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


6.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1E5X.html).

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

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Start the engine.

  1. Idle the engine for 5 seconds or more

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

  1. Confirm that the DTC is not output again.


NEXT

END