Sequential Dynamic Air Intake System (S-Dais) Control Block Diagram; Sequential Dynamic Air Intake System (S-Dais) Control Operation; Operation Outline; Operation List - Mazda RX-8 2004 Service Highlights

SEQUENTIAL DYNAMIC AIR INTAKE SYSTEM (S-DAIS) CONTROL BLOCK DIAGRAM

• The PCM determines the engine conditions based on each input signal and sends signals to the SSV solenoid
valve, the APV motor (13B-MSP (High Power)), the VDI solenoid valve, and the VFAD solenoid valve (13B-
MSP (High Power)).
ECT SENSOR
TP SENSOR
MAF SENSOR
ECCENTRIC SHAFT POSITION
SENSOR
BARO SENSOR
End Of Sie

SEQUENTIAL DYNAMIC AIR INTAKE SYSTEM (S-DAIS) CONTROL OPERATION

Operation Outline

• Operates the SSV solenoid valve, the APV motor (13B-MSP (High Power)), the VFAD solenoid valve (13B-
MSP (High Power)), and the VDI solenoid valve according to the engine speed range.

Operation list

Engine speed range and operation conditions for each valve
Item
Solenoid valve
SSV
Valve
Solenoid valve
VFAD
Valve
Motor
APV
Valve
Solenoid valve
VDI
Valve
*1
: 13B-MSP (Standard Power): Approx. 5,800 rpm or more
*2
: 13B-MSP (High Power): Approx. 7,300 rpm or more

Operation

SSV solenoid valve
• Turns on at the same time as the injection timing
of the secondary injector. Due to this, the intake
manifold vacuum is fed to the SSV actuator
allowing intake air from secondary port which is
opened by the SSV valve.
CONTROL SYSTEM
PCM
On: Energization, Off: Non-energization, Open: Valve opens, Closed: Valve closes
Low speed Medium speed
OFF
Closed
OFF
Closed
OFF
Closed
Closed
SSV SOLENOID VALVE
APV MOTOR
(13B-MSP (HIGH POWER))
VDI SOLENOID VALVE
VFAD SOLENOID VALVE
(13B-MSP (HIGH POWER))
Engine speed range
Medium-high speed
ON (Secondary injector is operating)
Open
ON (Approx. 5,500 rpm or more)
ON (Approx. 6,250 rpm or more)
OFF
OFF
SECONDARY
INJECTOR
ON
OFF
SSV
SOLENOID
ON
OPEN
SSV
CLOSE
CHU014000140S16
CHU0140S010
CHU014000140S17
High speed
Open
Open
*1*2
ON
Open
CHU0140S011
01–40–15
01–40