Mazda Training manual - part 13

 

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Mazda Training manual - part 13

 

 

Powertrain Engines 

Service Procedures 

Adjusting the Idle Speed 

• 

On the Mazda3 with ZJ and Z6 engine the idle speed must be adjusted at specified 
service intervals using M-MDS. To perform the procedure select the PIDs RPM (Rpm) 
and test# (Mode) in the M-MDS Datalogger, and set the PID test# to ON. Now the PCM 
(Powertrain Control Module) uses a fixed value for the ignition timing control, so that the 
idle speed can be adjusted on the air adjusting screw of the throttle body. 

 

NOTE:  The throttle body is equipped with a stop screw, which is used by the manufacturer 

to adjust the fully closed throttle position. Any adjustment of the stop screw is 
prohibited and can cause malfunctions such as sticking of the throttle valve. 

 

L1001.4_01152 

 

Air adjusting screw 

Throttle body 

2 Throttle 

valve 

  

 
 

Curriculum Training 

01-39 

Engines Powertrain 

MZI-type Engines 

• 

In the MZI engine line-up the following engines are available: 

– 

1.25 MZI engine with 1.25 L displacement 

– 

1.4 MZI engine with 1.4 L displacement 

– 

1.6 MZI engine with 1.6 L displacement 

 
• 

The MZI-type engines are fitted in the Mazda2 (DY) models. They are equipped with a 
multipoint manifold injection system and a distributorless ignition system (ignition coil 
unit). 

 

Mechanical  

Features 

• 

The mechanical system of the MZI-type engines has the following features: 

– 

Belt driven 16 valve DOHC engine 

– 

Valve train with manual or automatic timing belt tensioner, and mechanical bucket 
tappets 

– 

No variable valve timing system 

– 

V-ribbed belt drive with elastic belts 

 

01-40 Curriculum 

Training 

Powertrain Engines 

Overview 

 

L1001.4_01040 

 

NOTE:  Some of the components of the MZI-type engine are very similar in construction and 

operation to those of the L-type engines. Therefore, this section only describes the 
components which are new or differ from those of the L-type engines. 

 

Curriculum Training 

01-41 

Engines Powertrain 

Cylinder Block 

• 

The cylinder block features a bearing support frame, in which the main bearing caps are 
integrated. The bearing support frame is matched to the cylinder block and is not located 
by means of guide sleeves, i.e. the components of the crank train (crankshaft, 
connecting rod and piston) cannot be replaced separately. If one of the components 
exceeds the specification, the cylinder block must be replaced as a complete unit.  

• 

For this reason, a remanufactured cylinder block is available for the MZI-type engines, 
which is delivered completely with crankshaft, connecting rods, pistons, all oil passage 
blanking plugs and water drain plugs.

 

 

NOTE:  Thread repairs on the cylinder block using thread inserts are not permitted. 

 

L1001.4_01041 

 

1 Cylinder 

block 

3 Crankshaft 

Main bearing shells 

Bearing support frame 

 

01-42 Curriculum 

Training 

 

 

 

 

 

 

 

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