Mazda 323 1988 Workshop Manual page 307

IDLE SPEED CONTROL (ISC) SYSTEM
4B
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 englne: 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 D
323
Revised 10187
40-35