DTC    P0489    Exhaust Gas Recirculation Control Circuit Low

DTC    P0490    Exhaust Gas Recirculation Control Circuit High

for Preparation Click here


DESCRIPTION

The ECM opens and closes the EGR valve using a DC motor type actuator. Due to opening and closing the valve, the exhaust gas recirculation volume can be properly controlled.

P0489 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Turn the ignition switch to ON and wait for 10 seconds
(Monitor this DTC only once per driving cycle)
Open in EGR valve circuit
(2 trip detection logic)
  1. Electric EGR valve assembly
  2. Open in EGR valve circuit
  3. ECM

P0490 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine idling for 30 seconds
Short in EGR valve circuit
(2 trip detection logic)
  1. Electric EGR valve assembly
  2. Short in EGR valve circuit
  3. ECM

WIRING DIAGRAM


A198996E12


INSPECTION PROCEDURE

NOTICE:
When replacing the ECM, the ECM needs Registration and Initialization (Click here).

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. 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.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

  1. Connect the intelligent tester to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Actual EGR Valve Pos.

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

    Standard Value:
    Value smoothly changes to the set opening angle.



OK
Go to step 6

NG
Go to step 2

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


    A200328E02

  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 (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B9-23 (EGM+) - B50-1 (M+)
    		Always
    		Below 1 Ω
    B9-22 (EGM-) - B50-2 (M-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B9-23 (EGM+) or B50-1 (M+) - Body ground
    		Always
    		10 kΩ or higher
    B9-22 (EGM-) or B50-2 (M-) - Body ground
    		Always
    		10 kΩ or higher

    *1
    		Front view of wire harness connector
    (to Electric EGR Valve Assembly)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the electric EGR valve assembly connector.

  1. Reconnect the ECM connector.



NG
Go to step 5
OK


3.INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY

  1. Inspect the electric EGR valve assembly (Click here).



OK
Go to step 7

NG
Go to step 4

4.REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

  1. Replace the electric EGR valve assembly (Click here).

  1. Turn the ignition switch to ON.

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



NEXT
Go to step 6

5.REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT


6.CHECK WHETHER DTC OUTPUT RECURS (DTC P0489 OR P0490)

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear the DTCs (Click here).

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

  1. Turn the ignition switch to ON and wait for 10 seconds or more.

  1. Start the engine and wait for 30 seconds or more.

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

  1. Read the DTCs.
    Result 
    Result
    		Proceed to
    DTC P0489 or P0490
    		A
    No DTC output
    		B



B
END
A


7.REPLACE ECM

  1. Replace the ECM (Click here).


NEXT


8.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. Clear the DTCs (Click here).

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

  1. Turn the ignition switch to ON and wait for 10 seconds or more.

  1. Start the engine and wait for 30 seconds or more.

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

  1. Confirm that the DTC is not output again.


NEXT

END