Mazda2 Facelift. Manual — part 6

Engine Diesel

Engine

•

The injectors are numbered according to the firing order (e.g. injector No.2 is located at
cylinder No.3). On the 1.4 MZ-CD engine the cylinder No.1 is located next to the
transmission (French-style cylinder numbering).

M2FL_01003

1 Injector

numbering

3 Cylinder

numbering

2 Transmission

Service Training Mazda2 Facelift

01-3

Diesel Engine

Engine

Intake-air System

•

In order to comply with Euro 4 emission legislation, the intake-air system of the
1.4 MZ-CD Diesel engine of the Mazda2 Facelift has been revised as follows:

–

MAP (Manifold Absolute Pressure) sensor has been added

–

new hot film-type MAF (Mass Air Flow) sensor (instead of hot wire-type) with
integrated IAT (Intake Air Temperature) sensor

–

additional IAT sensor

–

ISV (Intake Shutter Valve) has been introduced for upgrading the EGR system

•

The operation of MAP sensor, MAF sensor, IAT sensor and the actuation of the ISV can
be monitored using the Datalogger function of the WDS (Worldwide Diagnostic System).

Parts Location

M2FL_01004

1

MAP sensor

4

IAT sensor

2

Hot film-type MAF sensor

5

Intake shutter valve

3

Fixed geometry turbo charger

01-4 Service

Training

Mazda2

Facelift

Engine Diesel

Engine

Exhaust Gas Recirculation System

•

For meeting the Euro 4 emission regulations the exhaust gas recirculation system of the
Mazda2 Facelift with 1.4 MZ-CD Diesel engine has the following new features:

–

EGR valve with DC (Direct Current) motor and position sensor

–

EGR cooler

–

ISV with DC motor

EGR Valve

•

For more precise exhaust gas admeasurement the previous pneumatic EGR valve has
been replaced by an electrically operated EGR valve.

•

The EGR valve is located at the rear side of the engine and is connected to the exhaust
manifold via an EGR duct integrated in the cylinder head.

•

It uses a DC motor for actuation. A cam plate transforms the rotational movement of the
motor into an axial movement of the EGR valve. An EGRVP (EGR Valve Position)
sensor is installed for monitoring the valve position.

M2FL_01005

1

DC motor with EGRVP sensor

2

EGR valve housing

Service Training Mazda2 Facelift

01-5

Diesel Engine

Engine

•

The position of the EGR valve is controlled by the PCM, which activates the DC motor
via a duty signal.

M2FL_01006

1

DC motor

3

Current detection circuit

2 PCM

•

At low engine speed the PCM controls the DC motor with a large duty cycle, so that the
EGR valve opens and exhaust gas is recirculated.

•

At high engine speed the PCM controls the DC motor with a small duty cycle, so that the
EGR valve closes and no exhaust gas is recirculated.

•

In order to remove any carbon deposits from the EGR valve seat a cleaning mode is
activated each time the ignition is switched off. Therefore, the PCM actuates the EGR
valve so that it is moved from the fully open position to the fully closed position several
times. This process takes approx. 30 s.

NOTE: If the engine coolant temperature is below -5°C, the EGR cleaning mode is cancelled

as the EGR valve could be frozen and would not move.

01-6 Service

Training

Mazda2

Facelift