P1448
Component Description
NOTE: If DTC P1448 is displayed with P0440, perform trouble diagnosis for DTC P1448 first.
The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components.
This solenoid valve is used only for diagnosis, and usually remains opened.
When the vent is closed, under normal purge Conditions, the evaporative emission control system is depressurized and allows "EVAP Control System (Small Leak)" diagnosis.
CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.
On Board Diagnosis Logic
Malfunction is detected when EVAP canister vent control valve remains opened under specified driving Conditions.
Possible Cause
- EVAP canister vent control valve
- EVAP control system pressure sensor and circuit
- Blocked rubber tube to EVAP canister vent control valve
- Water separator
- EVAP canister is saturated with water.
- Vacuum cut valve
DTC Confirmation Procedure
NOTE:
- If DTC P1448 is displayed with P0440 or P1440, perform trouble diagnosis for DTC P1448 first.
- If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.
WITH CONSULT-II
TESTING CONDITION:
- Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 to 3/4 full and vehicle is placed on flat level surface.
- Always perform test at a temperature of 0 to 30° C (32 to 86° F).
1. Turn ignition switch "ON".
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT-II.
4. Make sure that the following Conditions are met.
COOLAN TEMP/S 0 - 70° C (32 - 158° F)
INT/A TEMP SE 0 - 30° c (32 - 86° F)
5. Select "EVAP SML LEAK P0440/P1440" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT II.
Follow the instruction displayed.
If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to "Basic Inspection".
6. Make sure that "OK" is displayed.
If "NG" is displayed, go to the following step.
NOTE: Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.
7. Stop engine and wait at least 10 seconds, then turn "ON".
8. Disconnect hose from water separator.
9. Select "VENT CONTROL/V" of "ACTIVE TEST" mode with CONSULT-II.
10. Touch "ON" and "OFF" alternately.
11. Make sure the following.
Condition VENT CONTROL/V Air passage continuity between A and B
ON NO
OFF YES
If the result is NG, go to "Diagnostic Procedure" below.
If the result is OK, go to "Diagnostic Procedure" for DTC P0440.
Overall Function Check
Use this procedure to check the overall function of the EVAP canister vent control valve circuit. During this check, a DTC might not be confirmed.
WITH GST
1. Disconnect hose from water separator.
2. Disconnect EVAP canister vent control valve harness connector.
3. Verify the following.
Condition Air passage continuity
12 volt direct current No
supply between terminals 1 and 2
NO supply Yes
If the result is NG, go to "Diagnostic Procedure" below.
If the result is OK, go to "Diagnostic Procedure" for DTC P0440.
EC-VENT/V-01:
EC-VENT/V-01 - Connector View:
Wiring Diagram
E87, E89, E83, B5, M17, M18, M19 Connector Views:
ECM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND 48.:
Diagnostic Procedure
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