System Operational Test

Purge System Test:

1. Disconnect the red striped vacuum hose from the throttle body and connect a hand vacuum pump to the hose and plug the nipple.
2. While the engine is cold (coolant temperature less than 60° C or 140° F) allow the engine to idle and apply 375 mm Hg (14.8 in. Hg) of vacuum.
a. If vacuum holds proceed to next step.
b. If vacuum does not hold check vacuum hoses, fitings and routing integrity. If no faults are found proceed to Purge Control Solenoid/Testing and Inspection.
3. Increase engine speed to 3,000 RPM, apply 375 mm Hg (14.8 in Hg) of vacuum.
a. If vacuum holds proceed to next step.
b. If vacuum does not hold check vacuum hoses, fitings and routing integrity. If no faults are found proceed to Purge Control Solenoid/Testing and Inspection.
4. Allow the engine to warm up (engine coolant temperature greater than 70° C or 158° F).
5. With the engine operating at idle apply 375 mm Hg (14.8 in. Hg) of vacuum.
a. If vacuum holds proceed to next step.
b. If vacuum does not hold check vacuum hoses, fitings and routing integrity. If no faults are found proceed to Purge Control Solenoid/Testing and Inspection.
6. Within three minutes of engine start increase engine speed to 3,000 RPM and apply vacuum.
a. If vacuum does not hold proceed to next step.
b. If vacuum does hold proceed to PURGE CONTROL SOLENOID INSPECTION.

NOTE: The solenoid is controlled by the ECM. If the solenoid tests O.K. See Purge Control Solenoid Valve.

7. After more than three minutes have elapsed since engine start increase engine speed to 3,000 RPM, apply 375 mm Hg (14.8 in. Hg) and verify that vacuum is held momentarily and then leaks.

NOTE: Vacuum will leak continuously if the test is being performed at elevations greater than 2,200 m (7,200 ft.) or intake air temperature is greater than 50° C (122° F).