Evaporative Emissions System: Testing and Inspection

PURGE CONTROL SYSTEM INSPECTION
1. Disconnect the vacuum hose from the throttle body and connect it to a hand vacuum pump.
2. Plug the nipple where the vacuum hose was removed.
3. When the engine is at operating temperature [Engine coolant temperature: 80°C (176°F) or higher], apply vacuum at idle to check the condition of the engine and the vacuum.

Vacuum applied 53 kPa (15.7 in.Hg)
- Right after starting engine = Vacuum should be maintained.
- 10 or more seconds later = Vacuum should leak.









PURGE PORT VACUUM INSPECTION
1. Disconnect the vacuum hose from the throttle body purge vacuum nipple and connect a hand vacuum pump to the nipple.
2. Start the engine and raise the speed. Vacuum should be kept constant regardless of the increased engine speed.

NOTE: If no vacuum is generated, the throttle body purge port may be clogged.