Component Tests

EGR VACUUM TEST





1. Disconnect the vacuum hose (green stripe) from the EGR valve body, and connect a vacuum pump via the three way terminal.
2. Check the following points when the engine is both cold (engine coolant temperature 20°C [68°F] or below) and warm (engine coolant temperature 80°C [176°F)] or higher).





When engine is cold





When the engine is warm





3. Disconnect the three-way terminal and connect the hand vacuum pump directly to the Exhaust Gas Recirculation (EGR) valve.
4. Check whether the engine stalls or the idling is unstable when a vacuum of 27 kPa (7.9 in. Hg) or higher is applied during idling.

EGR VALVE TEST
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.
4. Blow in air from one passage of the EGR to check condition as follows.





EGR Vacuum

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)