Exhaust Gas Recirculation: Testing and Inspection

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 [coolant temperature 20°C (68°F) or below] and warm [Coolant temperature 7O°C (176°F) or higher].





WHEN THE ENGINE IS COLD





WHEN THE ENGINE IS WARM





3. Disconnect the three-way terminal and connect the hand vacuum pump directly to the EGR valve.
4. Check whether the engine stalls or the idling is unstable when a vacuum of 26 kPa (7.5 in.Hg) or higher is applied during idling.

EGR VALVE CONTROL VACUUM INSPECTION
1. Engine coolant temperature: 80 - 95°C (176-205°F)

Testing EGR System:

2. Disconnect the vacuum hose from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.
3. Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum rises proportionately with the rise in engine speed.

NOTE: If there is a problem with the change in vacuum, it is possible that the throttle body port may be clogged and require cleaning.

EGR VALVE INSPECTION
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.

CAUTION: When installing the EGR valve, use a new gasket and tighten to the specified torque.

Torque: 15 - 22 Nm (11 - 16 ft lb)