ECD SYSTEM > EGR Control Circuit

for Preparation Click here


DESCRIPTION

The EGR system recirculates exhaust gases, and is controlled to the proper volume to be suitable for all driving conditions. The recirculated gas mingles with the intake air, allowing the EGR system to slow down engine combustion and lower the combustion temperature. This helps reduce NOx emissions. In order to increase circulatory efficiency, the ECM adjusts the lift amount of the EGR valve and throttle valve. The VSV is turned ON by a signal from the ECM. This results in atmospheric air closing the EGR valve, which shuts off the exhaust gas (EGR cut-off).

WIRING DIAGRAM


A099793E02


INSPECTION PROCEDURE

NOTICE:
If the ECM is replaced, the new ECM needs initialization (Click here).


When using intelligent tester:

1.CHECK CONNECTION OF VACUUM HOSE

  1. Check the connection of vacuum hose.

    OK:
    Vacuum hose is connected securely.



NG
REPAIR OR REPLACE VACUUM HOSE
OK


2.CHECK VACUUM
G036665E01

  1. Using a 3-way connector, connect a vacuum gauge to the vacuum hose between the EGR E-VRV and EGR valve.

  1. Warm up the engine to above 80°C (176°F).

  1. Chck the vacuum at 1,500rpm.

    Result:
    Vacuum
    		Proceed to
    0 kPa (0 mmHg, 0 in.Hg)
    		A
    0 kPa (0 mmHg, 0 in.Hg) to 28 kPa (210 mmHg, 8.3 in.Hg)
    		B
    Above 28 kPa (210 mmHg, 8.3 in.Hg)
    		C



A
Go to step 7

C
Go to step 12
B


3.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (EGR CUT VACUUM SWITCHING VALVE)
A099240E01

  1. Disconnect the vacuum hose from the VSV.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester II ON.

  1. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EGR Cut.

  1. Check the operation.

    Result:
    When VSV is ON, air from port E flows out through air filter.
    When VSV is OFF, air does not flow from port E to air filter.



OK
Go to step 12
NG


4.INSPECT EGR CUT VACUUM SWITCHING VALVE
A099241E01

  1. Disconnect the V2 VSV connector.

  1. Measure the resistance of the VSV.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		37 to 44 Ω



NG
REPLACE VACUUM SWITCHING VALVE
OK


5.CHECK WIRE HARNESS (EGR CUT VACUUM SWITCHING VALVE - ECM)
G035726E01

  1. Disconnect the V2 VSV connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E7-18 (EGRC) - V2-2
    		Below 1 Ω
    E7-18 (EGRC) or V2-2 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.CHECK WIRE HARNESS (EGR CUT VACUUM SWITCHING VALVE - MAIN RELAY)
G035727E01

  1. Remove the integration relay from the engine room J/B (Click here).

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the V2 VSV connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-5 - V2-1
    		Below 1 Ω
    1J-5 or V2-1 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


7.CHECK ECM (EGR VOLTAGE)
G034909E03

  1. Disconnect the V1 E-VRV connector.

  1. During idling, check the waveform of the ECM connector.

    Standard:
    Tester Connection
    		Specified Condition
    E7-9 (EGR) - E7-7 (E1)
    		Correct waveform is as shown

    Tool Setting
    		Condition
    5 V/DIV., 1 msec./DIV.
    		Idling with warm engine

    HINT:
    The waveform varies depending on the E-VRV operation.



NG
REPLACE ECM
OK


8.CHECK OPERATION OF EGR ELECTRIC VACUUM REGULATING VALVE
A070837E02

  1. Disconnect the vacuum hoses from the E-VRV.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: Powertrain / Engine / Active Test / Control the EGR System.

  1. Check the operation.

    OK:
    When E-VRV is ON, air from port E flows out through port F.
    E-VRV is OFF, air does not flow from port E to port F.



OK
Go to step 12
NG


9.INSPECT EGR ELECTRIC VACUUM REGULATING VALVE (RESISTANCE)
A093008E04

  1. Disconnect the V1 E-VRV connector.

  1. Measure the resistance of the E-VRV.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		11 to 13 Ω



NG
REPLACE EGR ELECTRIC VACUUM REGULATING VALVE
OK


10.CHECK WIRE HARNESS (EGR ELECTRIC VACUUM REGULATING VALVE - ECM)
A099854E03

  1. Disconnect the V1 E-VRV connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E7-9 (EGR) - V1-2
    		Below 1 Ω
    E7-9 (EGR) or V1-2 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


11.CHECK WIRE HARNESS (EGR ELECTRIC VACUUM REGULATING VALVE - MAIN RELAY)
G034910E03

  1. Remove the integration relay from the engine room J/B (see page ).

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the V1 E-VRV connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-5 - V1-1
    		Below 1 Ω
    1J-5 or V1-1 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


12.INSPECT EGR VALVE ASSEMBLY


NG
REPLACE EGR VALVE ASSEMBLY
OK

REPLACE ECM 


When not using intelligent tester:

1.CHECK CONNECTION OF VACUUM HOSE

  1. Check the connection of vacuum hose.

    OK:
    Vacuum hose is connected securely.



NG
REPAIR OR REPLACE VACUUM HOSE
OK


2.CHECK VACUUM
G036665E01

  1. Using a 3-way connector, connect a vacuum gauge to the vacuum hose between the EGR E-VRV and EGR valve.

  1. Warm up the engine to above 80°C (176°F).

  1. Chck the vacuum at 1,500rpm.

    Result:
    Vacuum
    		Proceed to
    0 kPa (0 mmHg, 0 in.Hg)
    		A
    0 kPa (0 mmHg, 0 in.Hg) to 28 kPa (210 mmHg, 8.3 in.Hg)
    		B
    Above 28 kPa (210 mmHg, 8.3 in.Hg)
    		C



A
Go to step 7

C
Go to step 12
B


3.INSPECT EGR CUT VACUUM SWITCHING VALVE
A099241E01

  1. Disconnect the V2 VSV connector.

  1. Measure the resistance of the VSV.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		37 to 44 Ω



NG
REPLACE EGR CUT VACUUM SWITCHING VALVE
OK


4.INSPECT EGR CUT VACUUM SWITCHING VALVE (OPERATION)


NG
REPLACE EGR CUT VACUUM SWITCHING VALVE
OK


5.CHECK WIRE HARNESS (EGR CUT VACUUM SWITCHING VALVE - ECM)
G035726E01

  1. Disconnect the V2 VSV connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E7-18 (EGRC) - V2-2
    		Below 1 Ω
    E7-18 (EGRC) or V2-2 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.CHECK WIRE HARNESS (EGR CUT VACUUM SWITCHING VALVE - MAIN RELAY)
G035727E01

  1. Remove the integration relay from the engine room J/B (Click here).

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the V2 VSV connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-5 - V2-1
    		Below 1 Ω
    1J-5 or V2-1 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


7.CHECK ECM (EGR VOLTAGE)
G034909E03

  1. Disconnect the V1 E-VRV connector.

  1. During idling, check the waveform of the ECM connector.

    Standard:
    Tester Connection
    		Specified Condition
    E7-9 (EGR) - E7-7 (E1)
    		Correct waveform is as shown

    Tool Setting
    		Condition
    5 V/DIV., 1 msec./DIV.
    		Idling with warm engine

    HINT:
    The waveform varies depending on the E-VRV operation.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


8.INSPECT EGR ELECTRIC VACUUM REGULATING VALVE (RESISTANCE)
A093008E04

  1. Disconnect the V1 E-VRV connector.

  1. Measure the resistance of the E-VRV.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		11 to 13 Ω



NG
REPLACE EGR ELECTRIC VACUUM REGULATING VALVE
OK


9.INSPECT EGR ELECTRIC VACUUM REGULATING VALVE (OPERATION)


NG
REPLACE EGR ELECTRIC VACUUM REGULATING VALVE
OK


10.CHECK WIRE HARNESS (EGR ELECTRIC VACUUM REGULATING VALVE - ECM)
A099854E03

  1. Disconnect the V1 E-VRV connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E7-9 (EGR) - V1-2
    		Below 1 Ω
    E7-9 (EGR) or V1-2 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


11.CHECK WIRE HARNESS (EGR ELECTRIC VACUUM REGULATING VALVE - MAIN RELAY)
G034910E03

  1. Remove the integration relay from the engine room J/B (Click here).

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the V1 E-VRV connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-5 - V1-1
    		Below 1 Ω
    1J-5 or V1-1 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


12.INSPECT EGR VALVE ASSEMBLY


NG
REPLACE EGR VALVE ASSEMBLY
OK

REPLACE ECM