Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

SYSTEM INSPECTION

1. Start the engine and run it at idle.

SST Connection:

2. Ground the test connector (Green:1-pin).

Bypass Air Valve And Connector:

3. Disconnect the BAC valve connector.

NOTE: With the BAC valve disconnected the idle speed will be slower than normal.

Testing Air Valve Operation:

4. Pinch the air hose and note the engine speed.
Cold engine: Engine speed drops
Warm engine: Engine speed remains unchanged.

Bypass Air Valve And Connector:

5. Connect the BAC valve connector.
6. Warm up the engine to normal operating temperature and run it at idle.
7. Check that the idle speed is 850±50 rpm (M/T: Neutral; A/T: Park).
8. Disconnect the BAC valve connector.
9. Make sure the engine speed decreases.
10. Reconnect the BAC valve connector and disconnect the ground wire from the test connector.

BAC VALVE

Bypass Air Control Valve And Hose:

1. Disconnect the air hoses from the dynamic chamber.
2. Blow through the BAC valve from port "A" and check the air flow.
Cold engine: Air flows
Warm engine: Air doesn't flow

3. Disconnect the BAC valve connector.

Measuring Bypass Air Control Valve Resistance:

4. Connect an ohmmeter to the BAC valve terminals.
5. Check the resistance. It should be 5-20 Ohms.
6. If it is not correct, replace the BAC valve.