Dtc P0443 Evaporative Emission Control System Purge Control Valve Circuit
Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE PURGE VSV CONTROL)
INSPECT PURGE VSV
INSPECT PURGE VSV (POWER SOURCE VOLTAGE)
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY (EFI MAIN RELAY))
DTC 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 signals to the purge VSV so that the intake amount of evaporated fuel 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
| The terminal voltage of the ECM output circuit does not correspond with the drive signals from the ECM to the purge VSV (1 trip detection logic).
| - Open or short in purge VSV circuit
- Purge VSV
- ECM
|
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 intelligent tester. 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 INTELLIGENT TESTER (ACTIVATE THE PURGE VSV CONTROL) |
Connect the intelligent tester to the DLC3.
Disconnect the vacuum hose of the charcoal canister 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.
When the purge VSV is operated using the intelligent tester, check whether the purge VSV applies suction to your finger.
- OK:
Tester Operation
| Specified Condition
|
VSV is ON
| Suction of air
|
VSV is OFF
| No suction of air
|
Reconnect the vacuum hose of the charcoal canister to the purge VSV.
Disconnect the purge VSV connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1 - 2
| 20°C (68°F)
| 23 to 26 Ω
|
Text in Illustration*1
| Component without harness connected
(Purge VSV)
|
Reconnect the purge VSV connector.
| 3.INSPECT PURGE VSV (POWER SOURCE VOLTAGE) |
Disconnect the purge VSV connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
B112-2 - Body ground
| Ignition switch ON
| 11 to 14 V
|
Text in Illustration*1
| Front view of wire harness connector
(to Purge VSV)
|
Reconnect the purge VSV connector.
| 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 (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
B112-1 - B32-62 (PRG)
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
B112-1 or B32-62 (PRG) - Body ground
| Always
| 10 kΩ or higher
|
Text in Illustration*1
| Front view of wire harness connector
(to Purge VSV)
|
*2
| Front view of wire harness connector
(to ECM)
|
Reconnect the purge VSV connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - ECM) |
|
|
| 5.CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY (EFI MAIN RELAY)) |
Disconnect the purge VSV connector.
Remove the integration relay (EFI MAIN relay) from the engine room No. 1 relay block and disconnect the integration relay connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
B112-2 - 1A-4
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
B112-2 or 1A-4 - Body ground
| Always
| 10 kΩ or higher
|
Text in Illustration*1
| Front view of wire harness connector
(to Purge VSV)
|
*2
| Front view of wire harness connector
(to Integration Relay)
|
*3
| Engine Room No. 1 Relay Block
|
Reconnect the purge VSV connector.
Reinstall the integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - INTEGRATION RELAY (EFI MAIN RELAY)) |
|
|
