P1447

DTC P1447
Purge canister closure valve - poor performance. (Driving Cycle C)

Possible causes by suggested order of priority:
- Connectors C1032, C1034, C1029.
- Circuit integrity C1032/6 (NR) - C1034/1 (NR).
- Circuit integrity C1034/2 (NO) - C1029/8 (NO).
- Supply from C1029/8 (NO).
- Purge canister closure valve.
- Purge canister blocked.
- Tank vent hose blocked.
- Tank faulty.
- Under floor vent line blocked.
- Unleaded restrictor flap stuck.
- Anti-trickle valve blocked.
- Liquid vapor separator blocked.
- ECM.

Connectors C1032, C1034, C1029.
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Circuit integrity C1032/6 (NR) - C1034/1 (NR).
- Check for open circuit, short circuit to ground, supply or other circuit, damaged or unlatched connector, intermediate connectors or headers

Circuit integrity C1034/2 (NO) - C1029/8 (NO).
- Check for open circuit, short circuit to ground, supply or other circuit, damaged or unlatched connector, intermediate connectors or headers

Supply from C1029/8 (NO).
- Check voltage 10.0 to 14.0 volts

Purge canister closure valve.
- Purge canister closure valve resistance.
- Purge canister closure valve blocked or stuck.
PASS VALUES: 20 to 26 Ohms at room temperature.

Purge canister blocked.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Tank vent hose blocked.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Tank faulty.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Under floor vent line blocked.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Unleaded restrictor flap stuck.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Anti-trickle valve blocked.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Liquid vapor separator blocked.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

ECM.
- No detail available for this fault