Mazda 2009 5 Technical Information Seite 61
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WL-C Engine Emission System
EGR Solenoid Valve
BT-50_01047
A To EGR valve 1 EGR solenoid valve
B To vacuum chamber
EGR Control
• The PCM controls the position of the EGR valve by means of the EGR solenoid valve
(via duty signal) and the EGR control solenoid valve (via ON/OFF signal).
– When EGR is desired the PCM controls the EGR solenoid valve with a large duty
ratio and energizes the EGR control solenoid valve, so that vacuum is applied to the
EGR vacuum actuator. Due to this the EGR valve opens and exhaust gas is
recirculated.
– When less or no EGR is desired the PCM controls the EGR solenoid valve with a
small duty ratio and energizes the EGR control solenoid valve, so that the vacuum
applied to the EGR vacuum actuator is reduced by a ventilation passage. Due to this
the spring-loaded EGR valve closes and less or no exhaust gas is recirculated.
– When the EGR should be cut off (e.g. during acceleration) the PCM de-energizes the
EGR control solenoid valve, so that the EGR vacuum actuator is ventilated
irrespective of the control by the EGR solenoid valve. Due to this the EGR valve
closes quickly and EGR is stopped.
Service Training BT-50 01-37
- Mazda BT-50 1
- Table of Contents 3
- Table of Contents 4
- General Information 10
- General Information 11
- Engine WL-C Engine 25
- WL-C Engine Engine 26
- WL-C Engine Mechanical 27
- Mechanical WL-C Engine 28
- Lubrication System 35
- 01-12 Service Training BT-50 36
- System Overview 37
- 01-14 Service Training BT-50 38
- Cooling System 39
- Cooling System WL-C Engine 40
- 01-20 Service Training BT-50 44
- MAF Sensor 45
- MAF Learning Function 45
- MAF Data Reset 45
- MAP Sensor / IAT Sensor No.1 45
- 01-22 Service Training BT-50 46
- Intake Manifold 47
- 01-24 Service Training BT-50 48
- WL-C Engine Fuel System 49
- Fuel System WL-C Engine 50
- Exhaust System 55
- Exhaust System Engine 56
- – Warm-up switch pushed 57
- – ECT below 77 °C 57
- – IAT (no.2) below 13 °C 57
- Emission System WL-C Engine 58
- 4 MAF sensor 9 EGR valve 59
- 5 ISV 10 Air filter 59
- EGR Solenoid Valve 61
- EGR Control 61
- Charging and Starting System 63
- Control System WL-C Engine 64
- WL-C Engine Control System 65
- Suspension 81
- Suspension 82
- Wheels and Tyres Suspension 84
- Suspension Wheels and Tyres 85
- Driveline / Axle 87
- RFW System Driveline / Axle 88
- Driveline / Axle RFW System 89
- Transmission Clutch 91
- Clutch Transmission 92
- 05-6 Service Training BT-50 96
- Service Training BT-50 05-7 97
- 05-8 Service Training BT-50 98
- Service Training BT-50 05-9 99
- 05-10 Service Training BT-50 100
- BT-50_05010 101
- 05-12 Service Training BT-50 102
- 05-14 Service Training BT-50 104
- HVAC Basic System 105
- Basic System HVAC 106
- Control System HVAC 108
- HVAC Control System 109
- Restraints Airbag System 111
- Airbag System Restraints 112
- Body Panels 119
- Service Training BT-50 09-1 119
- 09-2 Service Training BT-50 120
- Cargo Box 121
- Anti-Corrosion Measures 121
- Glass/Windows/Mirrors 122
- 09-4 Service Training BT-50 122
- Features 123
- Theft-Deterrent System 123
- 09-6 Service Training BT-50 124
- Parts Location 125
- 09-8 Service Training BT-50 126
- Rear Combination Light 129
- 09-12 Service Training BT-50 130
- Wiring Diagram 131
- Wiper / Washer System 132
- 09-14 Service Training BT-50 132
- Specifications 134
- 09-18 Service Training BT-50 136
- 1 Base unit 4 Cover 137
- 3 Lower module 137
- – Information display 138
- – Speakers 138
- – Antenna condition 138
- 09-20 Service Training BT-50 138
- Power Systems 139
- Instrument Cluster Overview 141
- 09-24 Service Training BT-50 142
- Control System 143
- – DLC-2 143
- 09-26 Service Training BT-50 144
- List of Abbreviations 145
- List of Abbreviations 146
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