Component Description; Troubleshooting - Mazda 626 1989 Workshop Manual

4B
VIC SYSTEM

COMPONENT DESCRIPTION

Component
Dynamic chamber
Engine control unit
Intake manifold
6ne-way check valve
Ne signal pick-up
Solenoid valve (VIC)
Shutter valve
Shutter valve actuator

TROUBLESHOOTING

Check the condition of the wiring harness and connectors before checking the sensors or switches.
Note
Make the system inspection first. If no problem is found, continue with inspection of the
next system of the Troubleshooting Guide. (Refer to pages 4B—10 and 11.)
Possible cause
Symptom
During warm up
Rough
After warming up
idle
Poor acceleration, hesitation,
or lack of power
Poor fuel consumption
4B—36
Function
Provides chamber for VIC system
operation
Monitors engine rpm, controls solenoid
valve
Incorporates short and long intake
passages
Holds vacuum in vacuum chamber
Detects crank angle at 180° intervals;
sends signal to engine control unit
Controls vacuum to shutter valve actuator
Closes short intake port
Actuates shutter valve according to
vacuum from solenoid vaive
Vacuum
Shutter
chamber
valve
(Vacuum
actuator
leak)
4B—38 4B—37
2 3
2 3
6 5
6 5
Integrates one-way check valve
ON: above 5400 rpm
Contains shutter valve
Installed between dynamic chamber and
vacuum chamber
Installed in distributor
Solenoid valve
One-way
(VIC)
check
Vacuum Electric
valve
signal signal
4B—39 4B—38
4 —■
—
4 —
—
7 3
2
7
2 3
\
Remark
76F04B-033
Engine
control
System
unit inspection
(1C)
4B -37
4B—80
—
1
—
1
4
1
4
1
76F048-034