T. Checking the EVAP System

T. Checking the EVAP System

T1




Checking the EVAP valve
- Disconnect the valve hose and cannister control from the throttle housing.
- Connect a vacuum pump to the ventilation hose (the thick hose) and pump a negative pressure.

During the pumping process, a negative pressure should be indicated on the gauge.
The pressure will return swiftly to atmospheric pressure (14.7 psi) although a clear resistance will be felt during the pumping process.

If the negative pressure and resistance are OK
^ Check the vacuum hose T2.

If the negative pressure or resistance are absent:
^ Check the ventilation hose to the cannister for damage or leakage.

If this is OK:
^ Test with a new cannister.

T2




Checking the vacuum hose
- Pump negative pressure into the vacuum hose (the thin hose).
The gauge should indicate a negative pressure.

If a negative pressure is indicated:
^ Check the cannister control T3

If no negative pressure is indicated:
^ Check the hose for leakage.
If this is OK:
^ Test with a new

T3




Checking the cannister control
- Maintain the negative pressure in the vacuum hose.
- Blow into the ventilation hose (the thick hose)
The resistance which was present in operation T1 should not be felt when you blow into the hose (the cannister is ventilated).

If no resistance is felt:
Cannister and can nister control are OK.
^ ReReturno troubleshooting where it was interrupted.

If there is still resistance:
^ Check the vacuum hose for signs of damage by squeezing.
If this is OK:
^ Test with a new cannister.