DTC P0447 Evaporative Emission Control System Vent Control Circuit Open: Wiring Diagram
| Step | Check | Yes | No |
|---|---|---|---|
1 CHECK OUTPUT SIGNAL OF ECM.
|
Is the voltage 10 V or more? | Go to step 2. | Go to step 3. |
| 2 CHECK FOR POOR CONTACT. Check for poor contact of ECM connector. |
Is there poor contact of ECM connector? | Repair the poor contact of ECM connector. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary open or short circuit of harness or temporary poor contact of connector may be the cause.
|
| 3 CHECK POWER SUPPLY TO DRAIN VALVE. Measure the voltage between drain valve and chassis ground. Connector & terminal (R144) No. 1 (+) - Chassis ground (-): |
Is the voltage 10 V or more? | Go to step 4. | Repair the power supply circuit. |
4 CHECK HARNESS BETWEEN ECM AND DRAIN VALVE CONNECTOR.
|
Is the resistance 1 MΩ or more? | Go to step 5. | Repair the ground short circuit of harness between ECM and drain valve connector. |
| 5 CHECK HARNESS BETWEEN ECM AND DRAIN VALVE CONNECTOR. Measure the resistance of harness between ECM and drain valve connector. Connector & terminal (B135) No. 4 - (R144) No. 2: |
Is the resistance less than 1 Ω? | Go to step 6. | Repair the harness and connector.
NOTE:
In this case, repair the following item:
|
| 6 CHECK DRAIN VALVE. Measure the resistance between drain valve terminals. Terminals No. 1 - No. 2: |
Is the resistance 10 - 100 Ω? | Repair the poor contact of drain valve connector. | Replace the drain valve. Refer to DRAIN VALVE Drain Valve. |