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