DTC    P0443    Evaporative Emission Control System Purge Control Valve Circuit

for Preparation Click here


DESCRIPTION

In order to reduce Hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through the charcoal canister to the intake manifold for combustion in the cylinders.
The ECM changes the duty signal to the VSV for EVAP so that the intake 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
Proper response to ECM command does not occur (1 trip detection logic)
  1. Open or short in VSV for EVAP circuit
  2. VSV for EVAP
  3. ECM

WIRING DIAGRAM


G038504E03


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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 (VSV FOR EVAP)
A080362E03

  1. Disconnect the vacuum hose of the VSV.

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the intelligent tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control. Press the right or left button.

  1. Place your finger on port E. Check if the disconnected port applies suction to your finger when operating the VSV for EVAP using the intelligent tester.

    Standard voltage:
    Tester Operation
    		Specified Condition
    VSV is ON
    		Applies suction to your finger
    VSV is OFF
    		Applies no suction to your finger



OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.INSPECT ECM (PRG VOLTAGE)
A066060E59

  1. Turn the ignition switch ON.

  1. Measure the voltage of the E11 and E12 ECM connectors.

    Standard voltage:
    Symbols (Terminal No.)
    		Specified Condition
    E10-23 (PRG) - E11-3 (E1)
    		9 to 14 V



OK
REPLACE ECM
NG


3.INSPECT VSV FOR EVAP
Click here

OK:
Air flows when battery voltage is applied to VSV.



NG
REPLACE VSV FOR EVAP
OK


4.CHECK WIRE HARNESS (VSV FOR EVAP - ECM)
G039238E02

  1. Disconnect the E11 ECM connector.

  1. Disconnect the V3 VSV connector.

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

    Standard resistance:
    Symbols (Terminal No.)
    		Specified Condition
    V3-1 - E11-23 (PRG)
    		Below 1 Ω
    V3-1 or E11-23 (PRG) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK WIRE HARNESS (VSV FOR EVAP - INTEGRATION RELAY)
G039239E01

  1. Disconnect the 1J integration relay connector from the engine room junction block.

  1. Disconnect the V3 VSV connector.

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

    Standard resistance:
    Symbols (Terminal No.)
    		Specified Condition
    V3-2 - 1J-5
    		Below 1 Ω
    V3-2 or 1J-5 - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

INSPECT ECM POWER SOURCE CIRCUIT