Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Perform active test using intelligent tester (activate the vsv for evap control)

  5. Inspect duty vacuum switching valve (vsv for evap)

  6. Inspect duty vacuum switching valve (power source voltage)

  7. Check harness and connector (vsv for evap - integration relay)

  8. Check harness and connector (vsv for evap - 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 VSV for EVAP 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 Conditions
Trouble Areas
P0443
Terminal voltage of ECM output circuit does not correspond with drive signals from ECM to EVAP VSV
(1 trip detection logic)
  1. Open or short in VSV for EVAP circuit
  2. VSV for EVAP
  3. ECM

WIRING DIAGRAM


Sfi System - P0103 Yaris


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an 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 VSV FOR EVAP CONTROL)
  1. Connect an intelligent tester to the DLC3. Yaris

  2. Connect an intelligent tester to the DLC3.

  1. Remove the vacuum hose of the VSV for EVAP 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 VSV for EVAP is operated using the intelligent tester, check whether the disconnected hose applies suction to your finger.

    Standard:
    Tester Operation
    		Specified Conditions
    VSV is ON
    		Disconnected hose applies suction to finger
    VSV is OFF
    		Disconnected hose applies no suction to finger


OKnext
CHECK FOR INTERMITTENT PROBLEMS (Click here)
NG
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2.INSPECT DUTY VACUUM SWITCHING VALVE (VSV FOR EVAP)
  1. Disconnect the C3 duty vacuum switching valve connector. Yaris

  2. Disconnect the C3 duty vacuum switching valve connector.

  1. Measure the resistance between the terminals of the duty vacuum switching valve.

    Standard resistance:
    26 to 30 Ω at 20°C (68°F)

  1. Reconnect the duty vacuum switching valve connector.



NGnext
REPLACE DUTY VACUUM SWITCHING VALVE
OK
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3.INSPECT DUTY VACUUM SWITCHING VALVE (POWER SOURCE VOLTAGE)
Disconnect the C3 duty vacuum switching valve connector. Yaris

  1. Disconnect the C3 duty vacuum switching valve connector.

  1. Turn the ignition switch to ON.

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

    Standard voltage:
    Tester Connections
    		Specified Conditions
    VSV for EVAP (C3-2) - Body ground
    		9 to 14 V

  1. Reconnect the duty vacuum switching valve connector.



OKnext
Go to step 5
NG
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4.CHECK HARNESS AND CONNECTOR (VSV FOR EVAP - INTEGRATION RELAY)
Remove the integration relay from the engine room relay block. Yaris

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the C3 duty vacuum switching valve connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    VSV for EVAP (C3-2) - Engine room relay block (A-4)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    VSV for EVAP (C3-2) or Engine room relay block (A-4) - Body ground
    		10 kΩ or higher

  1. Reinstall the integration relay.

  1. Reconnect the duty vacuum switching valve connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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REPAIR OR REPLACE POWER SOURCE CIRCUIT COMPONENTS

5.CHECK HARNESS AND CONNECTOR (VSV FOR EVAP - ECM)
Disconnect the C20 ECM connector. Yaris

  1. Disconnect the C20 ECM connector.

  1. Disconnect the C3 duty vacuum switching valve connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    VSV for EVAP (C3-1) - PRG (C20-49)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    VSV for EVAP (C3-1) or PRG (C20-49) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the duty vacuum switching valve connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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REPLACE ECM (Click here)