P0443

DTC P0443

DTC Detecting Condition and Trouble Area






Wiring Diagram

Refer to P0441 DTC P0441.

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 30 - 50 km/h (19 - 31 mile/h) for 5 min. at 5th gear or D range. (Keep throttle valve opening 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 canister purge valve power supply circuit check

Turn OFF ignition switch and disconnect connector from EVAP canister purge valve.
Check for proper terminal connection to EVAP canister purge valve connector.
If connections are OK, check that EVAP canister purge valve power supply circuit (A1) voltage is battery voltage between EVAP canister purge valve connector 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 canister purge valve drive circuit check

Turn OFF ignition switch and disconnect connectors from ECM.
Check that EVAP canister purge valve drive circuit (B1) is as follows.
- Wiring harness resistance of EVAP canister purge valve drive circuit is less than 3 ohms.
- Insulation resistance of EVAP canister purge valve drive circuit is infinity between EVAP canister purge valve connector and vehicle body ground.
- Insulation resistance of wire harness is infinity between EVAP canister purge valve drive circuit terminal and each terminal at EVAP canister purge valve connector.
- Circuit voltage of EVAP canister purge 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 canister purge valve check

Check EVAP canister purge valve for resistance. EVAP Canister Purge Valve Inspection

Is it in good condition?
YES -
Substitute a known-good ECM and recheck.
NO -
Replace EVAP canister purge valve.