Code 0311
COMPONENT DESCRIPTION
The vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line between the fuel tank and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on board diagnosis. The vacuum cut valve bypass valve responds to signals from the ECM. When the ECM sends an ON (ground) signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the fuel tank.
EVAPORATIVE EMISSION SYSTEM DIAGRAM
CONSULT Reference Value in Data Monitor Mode
Specification data are reference values.
ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 43 (ECM ground).
ON BOARD DIAGNOSIS LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.
TESTING CONDITION: Always perform test at a temperature of 5 to 30 °C (41 to 86 °F).
With CONSULT
1. Turn ignition switch "ON".
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch "OFF" and wait at least 5 seconds.
4. Start engine and let it idle for at least 1 minute.
5. Select "PURG CN/V & S/N P1493" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
6. Touch "START".
7. When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 30 seconds.)
If "TESTING" is not displayed after 5 minutes, retry from step 3.
8. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS" and go to the following step.
If "NG" is displayed, refer to "Diagnostic Procedure" for DTC P1493.
9. Select "PURG VOL CN/V P1444" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
10. Touch "START".
If "COMPLETED" is displayed, go to step 12.
11. When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 20 seconds.)
If "TESTING" is not displayed after 5 minutes, retry from step 3.
12. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS" and go to the following step.
If "NG" is displayed, refer to "Diagnostic Procedure" for DTC P1444.
13. Select "VC/V BYPASS/V P1491" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
14. Touch "START".
15. When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 30 seconds.)
If "TESTING" is not displayed after 5 minutes, retry from step 3.
16. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS".
If "NG" is displayed, refer to "Diagnostic Procedure".
Overall Function Check
Without CONSULT
1. Remove vacuum cut valve and vacuum cut valve bypass valve as an assembly.
2. Apply vacuum to port A and check that there is no suction from port B.
3. Apply vacuum to port B and check that there is suction from port A.
4. Blow air in port B and check that there is a resistance to flow out of port A.
5. Supply battery voltage to the terminal.
6. Blow air in port A and check that air flow freely out of port B.
7. Blow air in port B and check that air flow freely out of port A.
8. If NG, go to "Diagnostic Procedure".
1 INSPECTION START:
2 CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION:
3 CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION:
4 CHECK EVAP PURGE LINE:
5 CHECK BYPASS HOSE:
6 CHECK VACUUM CUT VALVE BYPASS VALVE:
7 CHECK VACUUM CUT VALVE:
8 CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE:
9 CHECK CONNECTOR:
10 CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION:
11 CHECK EVAP CANISTER VENT CONTROL VALVE:
12 CHECK INTERMITTENT INCIDENT:
DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
Check air passage continuity.
With CONSULT
Perform "VC/V BYPASS/V" in "ACTIVE TEST" mode.
Without CONSULT
If NG or operation takes more than 1 second, replace vacuum cut valve bypass valve.
Check vacuum cut valve as follows:
1. Plug port C and D with fingers.
2. Apply vacuum to port A and check that there is no suction from port B.
3. Apply vacuum to port B and check that there is suction from port A.
4. Blow air in port B and check that there is a resistance to flow out of port A.
5. Open port C and D.
6. Blow air in port A check that air flows freely out of port C.
7. Blow air in port B check that air flows freely out of port D.