P0449

DTC P0449

DTC Detecting Condition and Trouble Area






Wiring Diagram










DTC Confirmation Procedure

WARNING:

If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.

- Select a level road with no traffic to minimize the risk of accident.
- Perform the test extremely carefully.
- Perform the road test using 2 persons, a driver and an assistant.

1) Warm up engine to normal operating temperature.
2) Drive vehicle at 40 km/h (25 mile/h) for 15 min. (Keep throttle valve operating constantly in this step.)

DTC Troubleshooting

1.
Was "Engine and Emission Control System Check" performed?
YES -
Go to Step 2.
NO -
Go to Engine and Emission Control System Check Engine and Emission Control System Check.

2. EVAP vent valve power supply circuit check

Turn OFF ignition switch and disconnect connector from EVAP leak check module.
Check for proper terminal connection to EVAP leak check module.
If connections are OK, check that circuit voltage is battery voltage between EVAP vent valve power supply circuit (A1) and vehicle body ground with ignition switch in ON position.

Is it in good condition?
YES -
Go to Step 3.
NO -
Repair or replace defective wire harness.

3. EVAP vent valve drive circuit check

Turn OFF ignition switch and disconnect connectors from ECM.
Check for proper terminal connection to ECM connectors.
If connections are OK, check that EVAP vent valve drive circuit (A2) is as follows.
- Wiring harness resistance of EVAP vent valve drive circuit is less than 3 ohms.
- Insulation resistance of EVAP vent valve drive circuit is infinity between EVAP vent valve connector and vehicle body ground.
- Insulation resistance of wire harness is infinity between EVAP vent valve drive circuit terminal and each other terminal at EVAP leak check module connector.
- Circuit voltage of EVAP vent valve drive circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition?
YES -
Go to Step 4.
NO -
Repair or replace defective wire harness.

4. EVAP vent valve check

Check EVAP vent valve coil resistance referring "EVAP Vent Valve Check" under EVAP Leak Check Module Inspection EVAP Leak Check Module Inspection.

Is it in good condition?
YES -
Substitute a known-good ECM and recheck.
NO -
Replace EVAP leak check module.