Idle Speed Control (Isc) System - Mazda 626 MX-6 Workshop Manual

4B
ISC SYSTEM

IDLE SPEED CONTROL (ISC) SYSTEM

Throttle sensor Air valve BAC valve (ISC valve + air valve)
Coolant temperature
86U04A-057
To improve idle smoothness, the ISC system controls the intake air amount by regulating the bypass
air amount that passes through the throttle body.
This system consists of the BAC valve and the control system.
The BAC valve consists of the air valve which functions only during cold engine conditions (below
50°C (122°F)) and the ISC valve which works throughout the entire engine speed range.
4B-45