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- Disconnect the vacuum hose (Green stripe) from the EGR valve, and then connect a hand vacuum pump via the three-way terminal.
- When the engine is hot or cold, check the condition of vacuum by racing the engine.
| Throttle valve |
Normal vacuum condition |
|---|---|
| Open quickly |
No vacuum will generate (the same as barometric pressure.) |
| Throttle valve |
Normal vacuum condition |
|---|---|
| Open quickly |
It will momentarily rise over 13 kPa |
- Disconnect the three-way terminal.
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- Connect the hand vacuum pump to the EGR valve nipple.
- Check whether the engine stalls or the idling is unstable when a vacuum of 30 kPa or higher is applied during idling.