GSIC - Global Service Information Center

### 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

## 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

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)

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

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)

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)

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)

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

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)

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)

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)

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

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

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)

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)

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)

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)

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)

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)

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