Mazda X-5. Manual - part 26

EMISSION SYSTEM 

01–16–7

01–16

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM OUTLINE [LF]

E5U011600030N01

Features

• With the adoption of the charcoal canister, release of evaporative gas into the atmosphere has been prevented.

• A duty solenoid valve (purge control valve) has been adopted for optimum control according to engine 

operation conditions.

• For control of evaporative purge, refer to CONTROL SYSTEM, EVAPORATIVE PURGE CONTROL. (See 01–

40–28 EVAPORATIVE PURGE CONTROL OUTLINE [LF], 01–40–29 EVAPORATIVE PURGE CONTROL 
BLOCK DIAGRAM [LF], 01–40–29 EVAPORATIVE PURGE CONTROL OPERATION [LF].)

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EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM STRUCTURE [LF]

E5U011600030N02

• Consists of a purge solenoid valve, charcoal canister, rollover valve, fuel shut-off valve, EVAP system leak 

detection pump, fuel-filler cap, air filter and evaporative chamber.

System diagram

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EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM OPERATION [LF]

E5U011600030N03

• When the engine is stopped, evaporative gas in the fuel tank flows out when the pressure increases and is 

absorbed by the charcoal canister.

• Evaporative gas that was absorbed by the charcoal canister passes through the solenoid valve together with 

air introduced from the charcoal canister orifice when the engine is running, and is fed to the engine according 
to engine operation conditions.

• If the pressure in the fuel tank decreases, air is introduced from the charcoal canister orifice through the 

rollover valve. If the charcoal canister orifice is clogged, the fuel-filler cap negative pressure valve opens and 
air is introduced to the fuel tank to prevent increased vacuum in the fuel tank, causing a load on the fuel tank.

• If there is a malfunction in the rollover valve, the fuel-filler cap positive pressure valve opens and evaporative 

gas is released into the atmosphere to prevent increased pressure in the fuel tank, causing a load on it.

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EVAP SYSTEM LEAK 
DETECTION PUMP

PURGE SOLENOID 
VALVE

AIR FILTER

FUEL-FILLER CAP

ROLLOVER VALVE

FUEL SHUT-OFF VALVE

CHARCOAL CANISTER

: TO PCM

EVAPORATIBE 
CHAMBER

TWC

WU-TWC

PCV VALVE

EGR
VALVE

E5U116ZS5003

EMISSION SYSTEM 

01–16–8

QUICK RELEASE CONNECTOR (EMISSION SYSTEM) FUNCTION [LF]

E5U011642692N01

• Quick release connectors that can be easily connected/disconnected have been adopted to improve 

serviceability.

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QUICK RELEASE CONNECTOR (EMISSION SYSTEM) CONSTRUCTION/OPERATION [LF]

E5U011642692N02

• There are four types of quick release connectors.

Quick release connector locations

Type A

• An SST is not used with this type.

• Mainly consists of a retainer and O-ring. The quick release connector is integrated with the evaporative hose 

and therefore cannot be disassembled.

• When the quick release connector is connected, 

the joint port projection is locked at the clamp lock 
point. By pushing the clamp release tab to 
expand the clamp, the lock point is released 
allowing the joint port to be disconnected.

• To connect the quick release connector properly, 

push it into the joint port until a locking click sound 
is heard.

PURGE SOLENOID 
VALVE

FUEL TANK SIDE

ENGINE COMPARTMENT 
SIDE

TYPE C

CHARCOAL CANISTER

AIR FILTER

EVAP SYSTEM LEAK 
DETECTION PUMP

TYPE A

TYPE A

TYPE D

TYPE B

E5U116ZS5004

QUICK RELEASE CONNECTOR

RELEASE TAB

LOCK POINT

C3U0114S091

EMISSION SYSTEM 

01–16–9

01–16

• New quick release connectors are fitted with a 

checker tab that prevents improper fit. This 
checker tab cannot normally be removed. When 
the quick release connector is properly connected 
to the joint port, the lock is released and the 
checker tab comes off. Due to this, it can be 
verified that the quick release connector is 
completely connected.

Type B

• An SST is not used with this type.

• The joint port can be disconnected by squeezing the release tab until the locking tabs release.

• To connect the quick release connector properly, push it into the joint port until a locking click sound is heard.

• New quick release connectors are fitted with a 

checker tab that prevents improper fit. This 
checker tab cannot normally be removed. When 
the quick release connector is properly connected 
to the connection point, the lock is released and 
the checker tab comes off. Due to this, it can be 
verified that the quick release connector is 
completely connected.

JOINT PORT

CHECKER TAB

C3U0116S105

RELEASE TAB

RELEASE TAB

JOINT PORT

JOINT PORT

QUICK RELEASE 
CONNECTOR

QUICK RELEASE 
CONNECTOR

E5U116ZW5041

CHECKER TAB

CONNECTION POINT

EPU113ZT4610

EMISSION SYSTEM 

01–16–10

Type C

• The connector can be disconnected by pinching 

the retainer tab with the SST and pulling the 
connector.

• To connect the quick release connector properly, 

push it into the joint port until a locking click sound 
is heard.

• New quick release connectors are fitted with a 

checker tab that prevents improper fit. This 
checker tab cannot normally be removed. When 
the quick release connector is properly connected 
to the connection point, the lock is released and 
the checker tab comes off. Due to this, it can be 
verified that the quick release connector is 
completely connected.

Type D

• Release the locks between the retainer and joint 

port by pressing each retainer lock one by one 
using a flathead screwdriver or a similar tool.

• To connect the quick release connector properly, 

push it into the joint port until a locking click sound 
is heard.

SST

E5U114ZW5003

CHECKER TAB

CONNECTION POINT

EPU113ZT4610

FLATHEAD 
SCREWDRIVER

QUICK RELEASE 
CONNECTOR

C3U0116W153