Evaporative Emissions System: Testing and Inspection

Purge Control System Test:

PURGE CONTROL SYSTEM TEST


COLD ENGINE TEST - Coolant temperature below 60°C (140°F)

1. Disconnect the red striped vacuum hose from the throttle body and connect it to a hand vacuum pump.
2. Plug the nipple from which the hose was removed.
3. With the engine idling, apply 15.7 in. Hg vacuum.
Vacuum should not leak.
4. Increase the RPM to 3000, apply 15.7 in. Hg vacuum.
Vacuum should not leak.

WARM ENGINE TEST - Coolant temperature above 70°C (158°F)

1. Disconnect the red striped vacuum hose from the throttle body and connect it to a hand vacuum pump.
2. Plug the nipple from which the hose was removed.
3. Increase RPM to 3000 within three minutes of engine start-up. Try applying vacuum.
Vacuum should leak.
4. Decrease engine RPM to idle, apply 15.7 in.Hg vacuum.
Vacuum should not leak.
5. Increase RPM to 3000 after three minutes have elapsed from engine start-up. Apply 15.7 in.Hg vacuum.
Vacuum will be maintained momentarily, after which it will leak. NOTE: If your altitude is higher than 2,200 meters (7,200 feet) or the intake air temperature is below 50°C (122°F), vacuum will leak continuously.



PURGE CONTROL SOLENOID VALVE

NOTE: When disconnecting the vacuum hoses, make an identifying mark on them to ensure proper routing when reconnecting.

1. Disconnect the red striped vacuum hose from the solenoid valve.
2. Disconnect the electrical harness connector from the solenoid valve.

Purge Control Solenoid Valve Vacuum Test:

3. Connect a hand vacuum pump to the red striped hose nipple.
4. Connect jumper wire leads to the purge control solenoid terminals.
5. Apply a vacuum to the solenoid valve. Vacuum should not leak.

Purge Control Solenoid Valve Voltage Test:

6. While vacuum is being applied, apply voltage directly to solenoid. Vacuum should leak.

Purge Control Solenoid Valve Resistance Check:

7. Measure the resistance between the terminals of the solenoid valve. Refer to SPECIFICATIONS.

Two-Way Check Valve Test:

TWO-WAY CHECK VALVE

1. Remove two-way check valve from vapor line.
2. Lightly blow air into each side of valve.
If air passes through after a slight resistance, the valve is good.