Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit
DESCRIPTION
CONFIRMATION DRIVING PATTERN
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)
INSPECT PURGE VSV (RESISTANCE)
INSPECT PURGE VSV (POWER SOURCE)
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY)
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 (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.
| 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)
| - Open or short in purge VSV circuit
- Purge VSV
- ECM
|
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn Techstream on.
- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on.
- Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
- HINT:
- The A/C switch and all accessory switches should be off.
- Idle the engine for 15 minutes or more [B].
- HINT:
- 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 / Trouble Codes [C].
- Read pending DTCs.
- HINT:
- 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
|
N/A
| - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
- HINT:
- 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 N/A, perform steps [D] and [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
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 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 USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL) |
Connect the Techstream to the DLC3.
Text in Illustration*1
| Purge VSV
|
*2
| Hose (to Canister)
|
Disconnect the vacuum hose (canister side) from the purge VSV.
Start the engine.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.
When the purge VSV is operated using the Techstream, check whether the port of the purge VSV applies suction to your finger.
- OK:
Techstream Operations
| Specified Conditions
|
VSV ON
| Purge VSV port applies suction to finger
|
VSV OFF
| Purge VSV port applies no suction to finger
|
| 2.INSPECT PURGE VSV (RESISTANCE) |
Inspect the purge VSV (YARIS_NCP93 RM000001RMW048X.html).
| 3.INSPECT PURGE VSV (POWER SOURCE) |
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
| Switch Condition
| Specified Condition
|
C59-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
Text in Illustration*a
| Front view of wire harness connector
(to Purge VSV)
|
| 4.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
|
C59-2 - C51-76 (PRG)
| Always
| Below 1 Ω
|
C59-2 or C51-76 (PRG) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY) |
Disconnect the purge VSV connector.
Remove the No. 1 integration relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
C59-1 - 1E-4
| Always
| Below 1 Ω
|
C59-1 or 1E-4 - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
