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been replaced by an electrically operated EGR valve.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