P1490

COMPONENT DESCRIPTION
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.

Consult-II Reference Value In Data Monitor Mode:

ECM Terminals And Reference Value:

On Board Diagnosis Logic:

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11 V at idle.




With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Start engine and wait at least 5 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

OR

With Generic Scan Tools
1. Start engine and wait at least 5 seconds.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

EC-BYPS/V-01:

EC-BYPS/V-01 Connector View:

WIRING DIAGRAM




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION

Vacuum cut valve bypass valve
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.