Car engine management system Mazda 626 (6)

Basic information about the engine management system
To reduce atmospheric pollution from incomplete combustion products and ensure good handling and fuel efficiency, the vehicle is equipped with several emission control...

On-board diagnostics and fault codes
Tools needed for troubleshooting 1. A digital multimeter is required to check components related to fuel injection and emissions control systems (figure 2.1). A digital...

Electronic control unit (ECU) — removal and installation
Attention! The models described in this manual are equipped with air bags. When working in the airbag area, always turn them off ( see chapter 12 ) to avoid accidental...

Throttle Position Sensor — checking, adjusting, and replacing
Examination 1. The throttle position sensor is mounted on the throttle body and connected to the throttle shaft. In accordance with the angle of rotation of the valve,...

Mass Air Flow Sensor — checking and replacing
1. The air flow sensor is located in the inlet duct. Depending on the model, the sensor contains a converter with a heated wire or a valve with a potentiometer. The...

Intake Air Temperature Sensor — checking and replacing
Examination 1. The air temperature sensor is a thermistor that changes its resistance depending on the temperature. When the resistance of the thermistor changes, the...

Coolant Temperature Sensor — checking and replacing
Examination 1. The coolant temperature sensor is a thermistor that changes its resistance depending on the temperature. When the resistance of the thermistor changes,...

Crankshaft Position Sensor — checking and replacing
Examination 1. The crankshaft position sensor determines the timing and order of fuel injection and ignition in the engine cylinders. This same sensor also measures the...

Camshaft Position Sensor — checking and replacing
Models produced from 1993 to 1997 Examination 1. The camshaft position sensor determines the order of fuel injection into the cylinders. On models produced from 1993 to...

Power Steering Hydraulic Pressure Sensor — checking and replacing
Examination 1. The contact pressure sensor in the power steering hydraulic system is located on the hydraulic system pump. When the hydraulic pressure reaches a preset...

Oxygen Sensor (O2S) — checking and replacing
Examination 1. The oxygen sensor monitors the oxygen content in the exhaust gas stream. Oxygen contained in the exhaust gases reacts with the sensor, which causes the...

Knock sensor — testing and replacement
Examination 1. Knock sensors detect abnormal engine vibration. The engine management system is programmed to control the ignition timing so that the engine operates on...

Vehicle speed sensor — checking and replacing
1. The vehicle speed sensor is located on the transmission. This is an inductive sensor with a permanent magnet, which, when the vehicle is moving, produces an...

Idle Air Control Valve — checking and replacing
Examination Caution! When performing checks with the engine off, keep your hands, clothing, hair, etc. away from rotating parts. 1. The engine idle speed is controlled...

Intake manifold configuration control system (with V-shaped engine)
1. Three air flaps are installed in the engine intake tract, which control the tract configuration. The variable intake tract is designed to increase cylinder filling at...

Forced crankcase ventilation system
1. Crankcase ventilation system (figure 16.1) reduces hydrocarbon emissions by directing crankcase gases into the engine combustion chambers for afterburning. Fresh air...

Exhaust gas recirculation system
General information 1. The recirculation system reduces the content of nitrogen oxides in the exhaust gases by directing them into the intake manifold for afterburning...

Fuel vapor recovery system
General information 1. The fuel vapor recovery system absorbs fuel vapors so that they do not enter the atmosphere, and at the appropriate moment, when the engine is...

Brake Pedal Sensor — checking and replacing
Examination 1. Brake pedal sensor (it is also known as a brake light switch) notifies the BEU that the vehicle is in braking mode. When braking, the sensor contacts...

Catalytic converter — inspection and replacement
Note: The catalytic converter may have an extended warranty that is separate from the vehicle warranty. Before replacing the catalytic converter at your own expense,...

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More sections on repairs of other Mazda models
• User manual: Controls and instruments Mazda3 BK (2003-2009)
• User manual: Controls and instruments Mazda6 GG (2002-2008)

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Capella 5 (1991-1997)