Air Bypass Control System Description; Operation Of Air Bypass Solenoid Valve - Mazda 121 Workshop Manual

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AIR BYPASS CONTROL SYSTEM
AIR BYPASS CONTROL SYSTEM
DESCFIPTION
The air bypass system operates to improve idle stability and vehicle drivability.
This system supplies throttle valve bypass air into intake manilold according to engine load condition and
driving conditions.
This system consists ot two solenoid valves controlled by the ECU.
AA AYPASS SOLENOIO VALVE @
ArF BYPASS SOLENOTO
VALVE @
AIF BYPASS SOLENOID VALVE @
THAOTTLE VALVE
Operation ot Ai. Bypass Solenoid Valve
Englno condltlon
Air bypa$ aolenold wlve
@
@
Duing cranking
To improve $anability
o
o
lgnition swilch OFFrON
To prcvenl lrorn slickng
o
'Acc€ssory ON
To improve srartability
o
P/S pressure sw{ch ON
o
o
,dJC swilch ON
o
o
Wam up (asoc-8ooc)
o
Selecl lever N-D (ATX)
To alleviats sudden engine speed drop
o
Dunng d€celelation {d€celelation conlrol)
To improve divabilty
o
o
'Accessory is headlights, rear window defrosler, blower swilch and cooling Jan.
F
F-107

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