Bypass Air Control (BAC) Valve

Bypass Air Control (BAC) Valve
Operational Inspection




1. Connect the data link connector terminals TEN and GND by using the special service tool (SST)-(System Selector).
2. Connect a tachometer to the data link connector terminal IG-.
3. Start the engine at engine cold condition.
4. Verify that the idle speed decreases gradually as the engine warms up.
5. If not, check the water hose of the BAC valve.
6. If water hose is OK, replace the BAC valve.