Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
1Az-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE PURGE VSV CONTROL)

INSPECT PURGE VSV

INSPECT PURGE VSV (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY)

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

DTC P0443 Evaporative Emission Control System Purge Control Valve Circuit


DESCRIPTION

To reduce HC emissions, evaporated fuel from the fuel tank is routed through a charcoal canister to the intake manifold for combustion in the cylinders.
The ECM changes the duty signals to the purge VSV so that the intake amount of HC emissions is appropriate for the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

DTC No.
DTC Detection Condition
Trouble Area
P0443
Terminal voltage of ECM output circuit does not correspond with drive signals from ECM to purge VSV
(1 trip detection logic)
  1. Open or short in purge VSV circuit
  2. Purge VSV
  3. ECM

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE PURGE VSV CONTROL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Connect the intelligent tester to the DLC3.

  1. Remove the vacuum hose of the purge VSV from the charcoal canister.

  1. Start the engine and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

  1. When the purge VSV is operated using the intelligent tester, check whether the disconnected hose applies suction to your finger.

    OK:
    Tester Operation
    		Specified Condition
    VSV is ON
    		Disconnected hose applies suction to finger
    VSV is OFF
    		Disconnected hose applies no suction to finger


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.INSPECT PURGE VSV


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Disconnect the B2 purge VSV connector.

  1. Measure the resistance between the terminals of the purge VSV.

    Standard resistance:
    23 to 26 Ω at 20°C (68°F)

  1. Reconnect the purge VSV connector.



NG
REPLACE PURGE VSV
OK


3.INSPECT PURGE VSV (POWER SOURCE VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Disconnect the B2 purge VSV connector.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the terminal of the wire harness side connector and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    Purge VSV (B2-1) - Body ground
    		9 to 14 V

  1. Reconnect the purge VSV connector.



OK
Go to step 5
NG


4.CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Remove the integration relay from the engine room No. 1 relay block.

  1. Disconnect the B2 purge VSV connector.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    Purge VSV (B2-1) - Engine room No. 1 relay block (1A-4)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    Purge VSV (B2-1) or Engine room No. 1 relay block (1A-4) - Body ground
    		10 kΩ or higher

  1. Reinstall the integration relay.

  1. Reconnect the purge VSV connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE POWER SOURCE CIRCUIT COMPONENTS

5.CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.1Az-Fe Engine Control System.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Disconnect the B2 purge VSV connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    Purge VSV (B2-2) - PRG (B32-49)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    Purge VSV (B2-2) or PRG (B32-49) - Body ground
    		10 kΩ or higher

  1. Reconnect the purge VSV connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM