Mazda 323 1988 Workshop Manual page 232

4A
IDLE SPEED CONTROL (ISC) SYSTEM
BAC Valve
Air valve
1. Disconnect the air hoses from the air funnel.
2. Blow through the BAC valve from port @. Check
the air flow.
Cold engine: Air flows
Warm engine: Air does not flow
ISC valve
1. Disconnect the BAC valve connector.
2. Connect an ohmmeter to the terminals of the BAC
valve.
3. Check the resistance.
Resistance: 5-20 n
Removal and installation
1. Drain the water from radiator.
2. Disconnect the by-pass air hoses.
3. Disconnect water hoses.
4. Disconnect the BAC connector.
5. Remove the BAC valve.
6. Install in the reverse order of removal.
4A-32
323
Revised 10167