EGR Control Solenoid: Testing and Inspection
EXHAUST GAS RECIRCULATION (EGR) SOLENOID VALVEINSPECTION
1. Disconnect the vacuum hose from the EGR solenoid, and then connect a hand vacuum pump via the three-way terminal.
When engine is cold [Engine coolant temperature: 20 °C(68 °C) or less]
When engine is hot [Engine coolant temperature: 80 °C(176 °C) or less]
2. Regarding the engine in cold and hot conditions, check the condition of vacuum when a rapid racing has been performed by opening the throttle valve quickly.
3. Disconnect the three-way terminal.
4. Connect the hand vacuum pump directly to the EGR valve.
5. Check whether the engine stalls or the idling is unstable when a vacuum of 29 kPa (8.7 in.Hg) or higher is applied during idling.
EGR VALVE
1. Remove the EGR valve and check for sticking, carbon deposits, etc.
If such conditions exist, clean with solvent to ensure tight valve seat contact.
2. Connect a manual vacuum pump to the EGR Valve.
3 Apply a vacuum of 67 kPa (9.7 psi) and check air tightness of diaphragm.
4. Blow in air from one passage of the EGR to check condition as shown in the table.
NOTE: When installing the EGR valve, use a new gasket and tighten to the specified torque.
Tightening torque
EGR valve: 19-28 Nm (190-280 kg-cm, 14-20 lb-ft)
EGR PORT VACUUM CHECK
1. Disconnect the vacuum hose from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.
2. Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum remains fairly constant.
EGR SOLENOID CHECK
NOTE: When disconnecting the vacuum hose, always make a mark so that it can be reconnected at original position.
1. Disconnect the vacuum hose from the solenoid valve.
2. Disconnect the harness connector.
3. Connect a hand vacuum pump to the nipple to which the green-striped vacuum hose was connected.
4. Check airtightness by applying a vacuum with voltage applied directly from the battery to the EGR control solenoid valve and without applying voltage.
5. Measure the resistance between the terminals of the solenoid valve.
Standard value: 29-35 Ohm [at 20 °C (68 °F)]