Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE PURGE VSV CONTROL)

INSPECT PURGE VSV

INSPECT PURGE VSV (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

DTC P0443 Evaporative Emission Control System Purge Control Valve Circuit


DESCRIPTION

HINT:
This DTC P0443 is applicable to Mexico models only.
To reduce hydrocarbon 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 hydrocarbon 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


Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE PURGE VSV CONTROL)


    Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Connect the Techstream to the DLC3.

  1. Disconnect the vacuum hose from the purge VSV.

  1. Start the engine.

  1. Turn the Techstream 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 Techstream, check whether the VSV applies suction to your finger.

    OK:
    Techstream Operation
    		Specified Condition
    VSV is ON
    		VSV applies suction to finger
    VSV is OFF
    		VSV applies no suction to finger

  1. Reconnect the vacuum hose to the purge VSV.



NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (COROLLA_ZRE142 RM000000PDQ0VNX.html)

2.INSPECT PURGE VSV

  1. Inspect the purge VSV (COROLLA_ZRE142 RM0000012OE01XX.html).



NG
REPLACE PURGE VSV (COROLLA_ZRE142 RM000002A4A01IX.html)
OK


3.INSPECT PURGE VSV (POWER SOURCE VOLTAGE)


    Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit

  1. Disconnect the purge VSV connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    B19-2 - Body ground
    		Ignition switch ON
    		11 to 14 V

  1. Reconnect the purge VSV connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - ENGINE ROOM RELAY BLOCK)
OK


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

  1. Disconnect the purge VSV connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    B19-1 - B31-49 (PRG)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B19-1 or B31-49 (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 (PURGE VSV - ECM)
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)