Diagnostic trouble code P0443 4GR-FSE Engine

Description

Wiring diagram

Inspection procedure

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSV FOR EVAP)

INSPECT ECM (CHECK VOLTAGE)

INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION OF VSV FOR EVAP)

CHECK HARNESS AND CONNECTOR (ECM - VSV FOR EVAP)

CHECK HARNESS AND CONNECTOR (EFI NO. 2 FUSE - VSV FOR EVAP)

DTC P0443 Evaporative Emission Control System Purge Control Valve Circuit

Description

To reduce 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 quantity 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)	Open or short in VSV for EVAP circuit VSV for EVAP ECM

Wiring diagram

Inspection procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 BY INTELLIGENT TESTER (VSV FOR EVAP)

1. Disconnect the vacuum hose from the VSV for EVAP.

2. Connect the intelligent tester to the DLC3.

3. Start the engine and turn the tester ON.

4. Enter the following menus: Power train / Engine / Active Test / Activate the VSV for EVAP Control. Press the right or left button.

5. Check if air is sucked into the port when operating the VSV for EVAP using the intelligent tester.

   Standard:

   Tester Operation	Specified Condition
   VSV is ON	Air is sucked
   VSV is OFF	No air sucked

OK	CHECK FOR INTERMITTENT PROBLEMS

NG

2.INSPECT ECM (CHECK VOLTAGE)

1. Turn the engine switch on (IG).

2. Measure the voltage between the terminals or the E3 and E4 ECM connectors.

   Standard voltage:

   Tester Connection	Specified Condition
   PRG (E3-11) - E1 (E4-7)	9 to 14 V

OK	REPLACE ECM

NG

3.INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION OF VSV FOR EVAP)

NG	REPLACE DUTY VACUUM SWITCHING VALVE

OK

4.CHECK HARNESS AND CONNECTOR (ECM - VSV FOR EVAP)

1. Disconnect the E3 ECM connector.

2. Disconnect the E15 VSV for EVAP connector.

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

   Standard resistance (Check for open):

   Tester Connection	Specified Condition
   VSV for EVAP (E15-2) - PRG (E3-11)	Below 1 ?

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   VSV for EVAP (E15-2) or PRG (E3-11) - Body ground	10 k? or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (EFI NO. 2 FUSE - VSV FOR EVAP)

1. Remove the EFI NO. 2 fuse from the engine room No. 2 relay block and junction block.

2. Disconnect the E15 VSV for EVAP connector.

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

   Standard resistance (Check for open):

   Tester Connection	Specified Condition
   VSV for EVAP (E15-1) - EFI NO. 2 fuse (2)	Below 1 ?

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   VSV for EVAP (E15-1) or EFI NO. 2 fuse (2) - Body ground	10 k? or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
INSPECT ECM POWER SOURCE CIRCUIT