BAC Valve Operation Inspection

BAC Valve Operation Inspection




1. Connect the Special Service Tool (System Selector) to the data link connector.
2. Set switch A to position 1.
3. Set the test switch to SELF TEST.

Special Service Tool New Generation Star Tester Connected to Data Link Connector 2:

4. Connect the Special Service Tools New Generation Star (NGS) tester to the data link connector 2.
5. Select the PID/DATA MONITOR AND RECORD function.
6. Verify that the engine is cold condition, and start the engine.
7. Select the "RPM" on the NGS display.
8. Verify that the engine speed decreases as the engine warms up.
9. Disconnect the Special Service Tool (System Selector).
10. If the engine speed will not decrease or decreases slowly, check the water hose connected to the BAC valve for leakage and clogs.
11. If the water hose is OK, inspect the following.
- Air valve.
- Idle Air Control (IAC) valve.