P0446 Below lower limit – Purge air line blocked
– Flow resistance of EVAP canister too high
Note
Fuel tank ventilation can be activated with the Porsche System Tester 2 in the Short test menu.
On-Board Diagnostic
Boxster Troubleshooting
1999 Supplement 3 P0446 - 1 System Overview 673_97
1 – EVAP canister purge valve
2 – EVAP canister
3 – Purge air
4 – Tank
5 – Pressure sensor
6 – Shutoff valve
7 – Operating purge valve
8 – To intake manifold
9 – Vacuum control valve
Troubleshooting
Boxster On-Board Diagnostic
P0446 - 2 Supplement 3 1999
Diagnosis Procedure 1
Check purge air line for blockage.
OK
Repair purge air line.
End
Replace EVAP canister.
End
Not OK
On-Board Diagnostic
Boxster Troubleshooting
1999 Supplement 3 P0446 - 3
1. Check purge air line for blockage.
1. Remove front right-hand wheel housing liner.
2. Detach purge air line (connection face up) from EVAP canister.
3. Blow through purge air line with compressed air.
Troubleshooting
Boxster On-Board Diagnostic P0446
Happy Boxstering,
Pedro
Pedro Bonilla1998 Boxster 986 - 311,000+ miles:
[www.PedrosGarage.com]
PCA National Club Racing Scrutineer - PCA National HPDE Instructor - PCA Technical Committee (Boxster/Cayman)
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