Pic. 6.12. Checking the exhaust gas recirculation system of the 4G1 engine
2. Plug the nipple from which the vacuum hose was removed.
3. Create a vacuum when the engine is cold and then when the engine is warm, while the engine should be idling. Check engine operating condition and vacuum.
Engine cold (coolant temperature 40°C or lower):
| Vacuum | Engine condition | Normal condition |
| Created | Without changes | The vacuum disappears |
Engine warm (coolant temperature 80°C or higher):
| Vacuum | Engine condition | Normal condition |
| 5.3 kPa | Without changes | Vacuum persists |
| idle «swim», or the engine stalls | Vacuum persists |