Initial Inspection and Diagnostic Overview

NOTES:
- To ensure proper operation of the EGR system, all passages and moving parts must be free of deposits that could cause plugging or sticking.
- Ensure that the system hoses do not leak -- Replace leaking components.

System Inspection
1. Check the EGR control system and EGR valve with the engine fully warmed up and running [engine coolant temperature over 76°C (170°F)].
2. With the transaxle in neutral and the throttle closed, allow the engine to idle for 70 seconds.
3. Abruptly accelerate the engine to approximately 2000 r/min, but not over 3000 r/min.
4. The EGR valve stem should move when accelerating the engine. Repeat the test several times to confirm movement.
5. If the EGR valve stem moves, the control system is operating normally.
6. Remove the vacuum hose from the EGR valve and plug the hose end.
7. Connect a hand vacuum pump directly to the EGR valve.
8. Check whether the engine stalls or if the idle is unstable when a vacuum of 12 kPa (3.5 in.Hg) or higher is applied while idling.











EGR Port Vacuum Inspection
1. Disconnect the vacuum hose from the intake manifold EGR vacuum nipple. Connect a hand vacuum pump to the nipple.
2. Start the engine and gradually raise the speed. The vacuum reading on the pump should remain constant.