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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mazda 3 (2003 release)

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Mazda 3
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Mazda
3
Operation and maintenance of car
Engine
General description new engines models L8, LF, L3
The mechanical part of engines
Appendix 1
Annex 2
Appendix 3
Control system
The principle of operation and the appointment of some components of the control system
Camshaft position sensor (CMP)
Camshaft position sensor (CKP)
The regulator of idling (IAC)
Management duct with varying characteristics (VAD)
Start-up system with variable characteristics (VIS)
The control system of mixing the intake air (VTCS)
Control valve timing change mechanism
Fuel injection control
Office off the air conditioning system
Management of the electric fan
Controller Area Network (CAN)
System of onboard diagnostics
Fault codes
Engine Z6 - mechanical part
Lubrication system
Cooling system
Intake system
Fuel system
Exhaust and Emission
Ignition system
Control system
Tables
Transmission
Chassis
Steering Gear
Brakes
Onboard electric
Body
 


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Fuel injection control



Main characteristics
There are two modes of operation of the fuel injection: "synchronous injection" and "asynchronous injection". Permission regulation with feedback signal and the barometric pressure sensor adjustable oxygen concentration.

Simultaneous injection
PCM unit determines the timing of fuel injection time and fuel quantity synchronized with the crank angle, on the basis of the following signals during intake and exhaust strokes each cylinder:
- The position of the crankshaft, mass air flow, coolant temperature, intake air temperature.

Asynchronous injection
PCM unit determines the timing of fuel injection time and fuel quantity on the basis of the following signals (without synchronization with the rotation angle of the crankshaft):
- Throttle position, mass air flow, temperature, coolant temperature, intake air temperature.

Correction for barometric pressure
Objective: To maintain the stability of the engine
Conditions: always.
Action: the lower the barometric pressure, a large correction.

Adjustment using feedback signal adjustable oxygen concentration sensor
Purpose: control of air / fuel ratio for maximum performance of the catalytic converter.
Conditions: zone feedback.
Action: the output voltage of the back gauge of oxygen concentration.




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