SFI SYSTEM, Diagnostic DTC:P0443

DTC Code	DTC Name
P0443	Evaporative Emission Control System Purge Control Valve Circuit

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 purge VSV 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.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0443	Evaporative Emission Control System Purge Control Valve Circuit	One of the following conditions is met (3 trip detection logic): Open or short in purge VSV circuit Short between EVP1 circuit and power source circuit Short between EVP1 and ground circuit	Open or short in purge VSV circuit Purge VSV ECM	Comes on	DTC stored

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

DTC P0443 is detected when the engine is warmed up, stops, restarts after 30 seconds, and idles for 1 minute.

CAUTION / NOTICE / HINT

Note:

After replacing the ECM, perform idle learning.

Click here

Tip:

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

PROCEDURE

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

*a	VSV is on
*b	VSV is off

Disconnect the fuel vapor feed hose (charcoal canister side) of the purge VSV.
Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.

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

Powertrain > Engine and ECT > Active Test


Tester Display
Activate the VSV for Evap Control

When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction your finger.

OK


GTS Operation	Specified Condition
ON	Purge VSV port applies suction to finger
OFF	Purge VSV port applies no suction to finger

Result


Proceed to
OK
NG

OK

CHECK FOR INTERMITTENT PROBLEMS

Click here

NG

INSPECT PURGE VSV

Inspect the purge VSV.
Click here

Result


Proceed to
OK
NG

NG

REPLACE PURGE VSV

Click here

OK

CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

*a	Front view of wire harness connector (to Purge VSV)

Disconnect the purge VSV connector.
Turn the ignition switch to ON.

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

Standard Voltage


Tester Connection	Condition	Specified Condition
B22-1 - Body ground	Ignition switch ON	11 to 14 V

Result


Proceed to
OK
NG

NG

CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - PURGE VSV)Click here

OK

CHECK HARNESS AND CONNECTOR (ECM - PURGE VSV)

Disconnect the ECM connector.
Disconnect the purge VSV connector.

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

Standard Resistance


Tester Connection	Condition	Specified Condition
B31-76 (EVP1) - B22-2	Always	Below 1 Ω
B31-76 (EVP1) or B22-2 - Body ground	Always	10 kΩ or higher

Result


Proceed to
OK
NG

OK

REPLACE ECM

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - PURGE VSV)

Disconnect the driver side junction block assembly connector.
Disconnect the purge VSV connector.

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

Standard Resistance


Tester Connection	Condition	Specified Condition
3K-5 - B22-1	Always	Below 1 Ω
3K-5 or B22-1 - Body ground	Always	10 kΩ or higher

Result


Proceed to
OK
NG

OK

CHECK ECM POWER SOURCE CIRCUIT

Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR