Exhaust Gas Recirculation: Testing and Inspection

INSPECTION

1. INSPECT EGR SYSTEM
2. INSPECT EGR VALVE POSITION SENSOR
a. Inspect the resistance of the EGR valve position sensor.
1. Disconnect the EGR valve position sensor connector.




2. Using an ohmmeter, measure the resistance between the terminals VC and E2.
Resistance: 1.5 - 4.3 kOhms
- If the resistance is not as specified, replace the EGR valve position sensor.
3. Reconnect the EGR valve position sensor connector.
b. Inspect the power output voltage of the EGR valve position sensor.
1. Disconnect the vacuum hose from the EGR valve.
2. Turn the ignition switch ON.




3. Connect a voltmeter to terminals VC and E2 of the ECM, and measure the power source voltage.
Voltage: 4.5 - 5.5 V




4. Connect a voltmeter to terminals EGLS and E2 of the ECM, and measure the power outlet voltage under the following conditions:
- Using a MITYVAC (Hand-Held Vacuum Pump), apply a vacuum (17.3 kPa, 130 mmHg, 5.1 in.Hg) to the EGR valve.
Voltage: 3.2 - 5.1 V
- Release the vacuum from the EGR valve.
Voltage: 0.4 - 1.6 V
- If the voltage is not as specified, replace the EGR valve position sensor.
5. Reconnect the vacuum hose to the EGR valve.
3. REMOVE EGR POSITION SENSOR
Remove the 3 nuts and EGR valve position sensor from the EGR valve.
Torque: 2 Nm (20 kg.cm, 17 in.lb)
4. REINSTALL EGR POSITION SENSOR
Installation is the reverse order of removal.
5. REMOVE EGR VALVE




a. Remove the EGR pipe.
Remove the 4 nuts, EGR pipe and 2 gaskets.

HINT: At the time of installation, please refer to the following items.
- Install 2 new gaskets.
- Torque: 12 Nm (120 kg.cm, 9 ft.lb)
b. Disconnect the EGR gas temperature sensor connector and clamp.




c. Remove the EGR valve.
1. Disconnect the EVAP hose from the EGR valve hook.
2. Disconnect the vacuum hose from the EGR valve.
3. Disconnect the EGR valve position sensor connector.
d. Remove the 3 nuts, EGR valve and gasket.

HINT: At the time of installation, please refer to the following items.
- Install a new gasket.
- Torque: 12 Nm (120 kg.cm, 9 ft.lb)

e. Remove the EGR gas temperature sensor.
Torque: 20 Nm (200 kg.cm, 14 ft.lb)




6. INSPECT EGR VALVE
Check for sticking and heavy carbon deposits.
- If a problem is found, replace the EGR valve.
7. REINSTALL EGR VALVE
Installation is the reverse order of removal.
8. REMOVE VCV
9. INSPECT VCV




a. Connect the MITYVAC (Hand-Held Vacuum Pump) to port S of the VCV.
b. Plug port Z completely with fingers.




c. Perform pumping 3 times and apply vacuum as shown in the illustration.
d. Stop the performing pumping and check the indicated value of the MITYVAC after about 10 seconds.
Standard value:
15 - 24 kPa (112 - 180 mmHg, 4.4 - 7.1 in.Hg)
- If the indicated value is not as specified, replace the VCV.
10. REINSTALL VCV
11. INSPECT VSV FOR EGR