Mazda Training manual - part 31

Powertrain Engines 

Cooling System 

Features 

• 

The cooling system of the Y-type engines has the following features: 

– 

Timing belt driven water pump 

– 

Pressurized type coolant reserve tank 

– 

FL22 longlife engine coolant (only Y6 engine) 

– 

Cooling fan controlled by relays or by a fan control module (depending on model)

 

 

Parts Location 

 

L1001.4_01113 

Mazda3 

 

1 

Coolant reserve tank 

5 

Radiator cowling 

2 

Cooling system cap 

6 

Cooling fan motor with fan control 
module 

3 

Water pump 

7 

Cooling fan 

4 Thermostat 

8 Radiator 

 
 
 

Curriculum Training 

01-111 

Engines Powertrain 

Diesel Particulate Filter System 

• 

The Mazda3 with Y6 high-power engine features a DPF with a honeycomb structure, 
which must be regenerated at certain intervals. In order to facilitate the regeneration 
process, the Mazda3 uses a special fuel additive that is automatically injected into the 
fuel tank. During the combustion process the additive attaches itself to the soot 
particulates, which then accumulate in the filter. As a result, the temperature to burn off 
the particulates is lowered. 

 

L1001.4_01145 

 

1 Fuel 

additive 

2 Soot 

 
• 

Pressure and temperature sensors in the DPF detect when the soot accumulation 
capacity of the filter is reached. The engine control system then increases the exhaust 
gas temperature by multiple fuel injections to burn off the particulates. 

• 

After regeneration ash residues that have formed from the fuel additive and the engine 
oil remain in the DPF, clogging the filter pores. For this reason, the DPF must be 
replaced every 120,000 km. 

• 

In addition, the fuel additive tank must be refilled every 60,000 km. 

01-112 Curriculum 

Training 

Powertrain Engines 

Service Procedures  

Bleeding the Fuel System 

• 

Since the Mazda3 with Y6 engine features no priming pump for the low-pressure fuel 
system, a hand pump (SST) must be used to bleed the system when the fuel filter has 
been replaced (refer to the workshop manual for details). 

 

L1001.4_01133 

 

1 Hand 

pump 

(SST) 

  

 

Curriculum Training 

01-113 

Engines Powertrain 

Refilling the Fuel Additive Tank 

• 

The fuel additive tank must be refilled every 60,000 km. Due to its installation position at 
the crossmember behind the fuel tank, a special fuel additive refill kit is available, which 
consists of the fuel additive container, filler hose with valve, overflow hose and overflow 
bottle (refer to the workshop manual for details).  

• 

After refilling the fuel additive tank the parameter “Calculated additive level” in the FACM 
(Fuel Additive Control Module) must be reset with the aid of M-MDS. To perform the 
procedure select the option Toolbox

ÆPowertrainÆService FunctionsÆFACMÆ 

Refill FAT and follow the instructions of M-MDS. 

 

NOTE:  Do NOT use the option “System Prime” when refilling the fuel additive tank. This will 

cause an excessive amount of fuel additive to be forced into the fuel tank, since the 
fuel additive injection line is already full. 

 

L1001.4_01134 

 

1 

Fuel additive container 

4 

Overflow bottle 

2 

Filler hose with valve 

5 

Net with hook 

3 

Overflow hose 

6 

Fuel additive tank 

 

01-114 Curriculum 

Training