SFI SYSTEM(w/ EGR System), Diagnostic DTC:P0443
| DTC Code | DTC Name |
|---|---|
| P0443 | Evaporative Emission Control System Purge Control Valve Circuit |
DESCRIPTION
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 signal sent to the purge VSV (Vacuum Switching Valve for Purge Control) 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. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Memory |
|---|---|---|---|---|---|
P0443 |
Evaporative Emission Control System Purge Control Valve Circuit |
Terminal voltage of the ECM output circuit does not correspond with the drive signals sent from the ECM to the purge VSV (1 trip detection logic). |
|
Comes on |
DTC stored |
CONFIRMATION DRIVING PATTERN
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester on.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the tester on.
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
Tip:The A/C switch and all accessory switches should be off.
Idle the engine for 15 minutes or more [B].
Tip:Check the EVAP (Purge) VSV item in the Data List. When the value of this item is between 5 and 95%, the judgment will be performed.
Enter the following menus: Powertrain / Engine and ECT / DTC [C].
Read the pending DTCs.
Tip:If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0443.
Check the DTC judgment result.
Tester Display
Description
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
UNKNOWN
Unable to perform DTC judgment
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
Tip:If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] through [E].
Drive the vehicle at a constant speed between 40 and 60 km/h (25 and 38 mph) for 10 minutes [D].
CAUTION:When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Check the DTC judgment result [E].
WIRING DIAGRAM
CAUTION / NOTICE / 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.
PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE VSV FOR EVAP CONTROL)
-
Connect the intelligent tester to the DLC3.
Disconnect the vacuum hose (charcoal canister side) from the purge VSV.
Start the engine.
Turn the tester 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 intelligent tester, check whether the port of the purge VSV applies suction to your finger.
OK
Tester Operation
Specified Condition
VSV ON
Purge VSV port applies suction to finger
VSV OFF
Purge VSV port applies no suction to finger
Reconnect the vacuum hose to the purge VSV.
Result
Result
OK
NG
-
INSPECT PURGE VSV
Inspect the purge VSV.
Result
Result
OK
NG
INSPECT PURGE VSV (POWER SOURCE)
-
*a
Front view of wire harness connector
(to Purge VSV)
Disconnect the purge VSV connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Switch Condition
Specified Condition
C8-1 - Body ground
Engine switch on (IG)
11 to 14 V
Reconnect the purge VSV connector.
Result
Result
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR OR REPLACE FUSE (PURGE VSV - NO. 1 INTEGRATION RELAY)
-
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
Disconnect the purge VSV connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
C8-2 - C30-18 (PRG)
Always
Below 1 Ω
C8-2 or C30-18 (PRG) - Body ground
Always
10 kΩ or higher
Reconnect the purge VSV connector.
Reconnect the ECM connector.
Result
Result
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
PERFORM CONFIRMATION DRIVING PATTERN
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
Powertrain > Engine and ECT > Clear DTCs
Turn the engine switch off and wait for at least 30 seconds.
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
Idle the engine for 15 minutes or more.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Powertrain > Engine and ECT > Utility
Tester Display
All Readiness
Input the DTC: P0443.
Check the DTC judgment result.
Result
Result
Proceed to
NORMAL (DTC is not output)
A
ABNORMAL (DTC P0443 is output)
B
Tip:If the judgment result shows INCOMPLETE or UNKNOWN, drive the vehicle at a constant speed between 40 and 60 km/h (25 and 38 mph) for 10 minutes and check the DTC judgment result again.