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).
3. Disconnect the BAC valve connector.
NOTE: With the BAC valve disconnected the idle speed will be slower than normal.

Pinching The Air Hose:

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

Bypass Air Control 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 (Neutral).
8. Disconnect the BAC valve connector.
9. Check the ISC valve operation to make sure the engine speed decreases.

Bypass Air Control Valve, Disconnected:

10. Reconnect the BAC valve connector and disconnect the ground wire from the test connector.

BAC VALVE

1. Disconnect the air hoses from the dynamic chamber.

Bypass Air Control Valve, Port "A":

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.

Idle Speed Control Valve Resistance Check:

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.