P0447

DTC P0447: Evaporative Emission Control System Vent Control Circuit Open

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool to DLC.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it at idle speed (600 rpm or more) for 1 minute.
4) Check DTC and pending DTC.

DTC Troubleshooting

1.
Was "Engine System Check" performed?
YES
Go to Step 2.
NO
Go to Engine System Check Engine System Check.

2. Check EVAP canister purge power supply circuit.

Turn OFF ignition switch, disconnect connector from EVAP canister vent valve.
Measure voltage between engine ground and "BLK/RED" wire terminal in EVAP canister vent valve harness.

Is it voltage 10 - 14 V?
YES
Go to Step 3.
NO
"BLK/RED" wire open circuit.

3. Check wire circuit.

Disconnect connector from ECM with ignition switch turned OFF.
Measure resistance between "G04-7" terminal in ECM harness connector and vehicle body ground.

Is resistance infinity?
YES
Go to Step 4.
NO
"BLU/WHT" wire shorted to ground circuit.

4. Check wire circuit.

Measure voltage between "G04-7" terminal in ECM harness connector and vehicle body ground.

Is voltage 0 V?
YES
Go to Step 5.
NO
"BLU/WHT" wire shorted to others circuit.

5. Check wire circuit.

Connect connector to vent control valve with ignition switch turned OFF.
Turn ON ignition switch, measure voltage between "G04-7" terminal in ECM harness connector and vehicle body ground.

Is it voltage 10 - 14 V?
YES
Go to Step 6.
NO
"BLU/WHT" wire open circuit.

6. Check EVAP canister vent control valve.

Check EVAP canister vent control valve referring to EVAP Canister Vent Valve Inspection EVAP Canister Vent Valve Inspection.

Is it good condition?
YES
Go to Step 7.
NO
Faulty EVAP canister purge control valve.

7. Check EVAP canister vent control circuit.

With ignition switch turned OFF, measure resistance between "G04-8" (or "G04-23") terminal wire and "G04-7" terminal in ECM harness connector.

Is resistance below 40 ohms at 20 °C, 68 °F?
YES
Faulty ECM, substitute a known-good ECM and recheck.
NO
"BLK/RED" and/or "BLU/BLK" wire in high resistance circuit.