Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EVAP CONTROL)

INSPECT PURGE VSV

INSPECT PURGE VSV (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY)

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 signal sent to the purge VSV so that the intake amount of HC emissions is appropriate for driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

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

WIRING DIAGRAM

  1. for Automatic Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. for Manual Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the GTS. 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 GTS (ACTIVATE THE VSV FOR EVAP CONTROL)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Connect the GTS to the DLC3.

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

  1. Start the engine and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

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

    OK:
    GTS Operation
    		Specified Condition
    VSV is ON
    		Disconnected hose applies suction to finger
    VSV is OFF
    		Disconnected hose applies no suction to finger
    Text in Illustration
    *1
    		Purge VSV
    *2
    		Hose (to Canister)


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000PDQ18TX.html)

2.INSPECT PURGE VSV

  1. Inspect the purge VSV (LandCruiser RM0000029LK03UX_01_0001.html).



NG
REPLACE PURGE VSV (LandCruiser RM000002WOT018X.html)
OK


3.INSPECT PURGE VSV (POWER SOURCE VOLTAGE)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Disconnect the purge VSV connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    C138-1 - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Purge VSV)

  1. Reconnect the purge VSV connector.



NG
Go to step 5
OK


4.CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

  1. Disconnect the purge VSV connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C138-2 - C37-10 (PRG)
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C138-2 - C36-18 (PRG)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C138-2 or C37-10 (PRG) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C138-2 or C36-18 (PRG) - Body ground
    		Always
    		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 (LandCruiser RM00000329203TX.html)

5.CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY)

  1. Disconnect the purge VSV connector.

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

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C138-1 - 1B-4
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C138-1 or 1B-4 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the purge VSV connector.

  1. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE POWER SOURCE CIRCUIT COMPONENTS