P1443

COMPONENT DESCRIPTION
Canister control vacuum check switch
The canister control vacuum check switch is installed in the vacuum line between EVAP canister purge control solenoid valve and EVAP canister purge control valve (built into EVAP canister). The switch detects vacuum signal to the EVAP canister purge control valve, and sends an "ON" or "OFF" signal to the ECM. When no vacuum is supplied to the valve, the canister control vacuum check switch sends an "ON" signal to the ECM. When vacuum is supplied to the valve, canister control vacuum check switch sends "OFF" signal to the ECM.
The canister control vacuum check switch is not used to control the engine system. It is used only for on board diagnosis.




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

With Consult
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait at least 5 seconds.
3) Turn ignition switch "ON".
4) Select "DATA MONITOR" mode with CONSULT.
5) Start engine and warm it up sufficiently.
6) Wait at least 6 seconds.

OR

With GST
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait at least 5 seconds.
3) Start engine and warm it up sufficiently.
4) Wait at least 6 seconds.
5) Select "MODE 3" with GST.

OR

Without Scan Tools
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait at least 5 seconds.
3) Start engine and warm it up sufficiently.
4) Wait at least 6 seconds, and turn ignition switch "OFF".
5) Wait at least 5 seconds, and then turn ignition switch "ON".
6) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.




WIRING DIAGRAM







DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Canister control vacuum check switch
1. Disconnect hose from canister control vacuum check switch.




2. Use vacuum pump to apply vacuum to canister control vacuum check switch as shown in figure.
3. Start engine.




4. Check voltage between terminal (1) and engine ground with CONSULT or tester.
5. If NG, replace canister control vacuum check switch.