EGR Valve: Testing and Inspection

Disconnecting EGR System:

EGR CONTROL VALVE

1. Warm up the engine and run it at idle.
2. Disconnect the vacuum hose from the EGR control valve and plug the hose.
3. Verify that the engine runs smoothly.
4. If it does not, clean the exhaust gas passage in the valve or replace the valve.

NOTE: Before replacing the EGR control valve, check the intake air and control systems.

Vacuum Pump Connection:

5. Connect a vacuum pump to the valve, and apply vacuum.
6. Verify that the engine runs roughly or stops at more than 40 - 60 mmHg (1.57 - 2.36 inHg) vacuum.
7. If it does not, replace the EGR control valve and torque fasteners to 8 - 11 Nm (6 - 8 ft lb).

Checking EGR Position Sensor Resistance:

EGR POSITION SENSOR RESISTANCE

1. Disconnect the sensor connector.
2. Remove the rubber boot from the connector.
3. Check resistance between the terminals while applying 0 - 150 mmHg (0 - 5.9 inHg) vacuum to the EGR control valve, using a vacuum pump.

Terminals Resistance

B - C 5K ohms
A - C 5.5 - 0K ohms
A - B 0.7 - 6.0K ohms

Checking Vent Valve:

DUTY SOLENOID VENT VALVE

1. Disconnect the vacuum hoses.
2. Blow through the vent hose and verify that air passes.
3. Disconnect the duty solenoid valve connector.
4. Apply battery power and ground the solenoid valve as shown.
5. Blow through the vent hose and verify that air does not flow.
6. If a problem is found, replace the duty solenoid valve.

Checking Vacuum Valve:

DUTY SOLENOID VACUUM VALVE

1. Disconnect the vacuum hoses.
2. Blow through the vacuum hose and verify that air does not flow.
3. Disconnect the duty solenoid valve connector.
4. Apply battery power and ground the solenoid valve as shown.
5. Blow through the vacuum hose and verify that air passes.
6. If a problem is found, replace the duty solenoid valve.

Checking Duty Solenoid Valve Connector:

DUTY SOLENOID VALVE VOLTAGE INSPECTION

1. Remove the rubber boot from the connector.
2. Turn the ignition switch ON.
3. Using a voltmeter, verify that voltage at each terminal is approximately 12V.
4. If on any terminal it is not, check the duty solenoid valve, the wiring of the valve, and the "2C" and "2D" terminals of the engine control unit.