Mazda 6. Manual - part 125

F–36

EXHAUST SYSTEM 

.

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EXHAUST SYSTEM 

F–37

F

HO2S Removal Note

1. Remove the HO2S using the SST before 

removing the exhaust manifold.

Exhaust Manifold Installation Note

1. Tighten the exhaust manifold installation nuts in 

the order shown.

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1

Main silencer

2

Middle pipe

3

TWC

4

Exhaust manifold insulator (upper)

5

Bracket

6

Exhaust manifold
(See 

F–37 Exhaust Manifold Installation Note

)

7

Exhaust manifold gasket

8

Exhaust manifold insulator (lower)

9

HO2S (front)
(See 

F–37 HO2S Removal Note

)

10

HO2S (rear)
(See 

F–37 HO2S Removal Note

)

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F–38

EMISSION SYSTEM 

CHARCOAL CANISTER INSPECTION

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1. Remove the charcoal canister.
2. Plug the atmosphere side port and purge solenoid valve side port of the charcoal canister.
3. Blow air into the charcoal canister from the fuel tank side port and verify that there is no air leakage.

• If there is air leakage, replace the charcoal canister.

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EVAPORATIVE GAS CHECK VALVE (ONE-WAY) INSPECTION (L.H.D.)

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1. Remove the evaporative gas check valve (one-way).
2. Apply pressure to port A, and verify that there is no airflow.

• If there is airflow, replace the evaporative gas check valve (one-way).

3. Apply negative pressure to port A, and verify that there is air flow.

• If there is no airflow, replace the evaporative gas check valve (one-way).

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PURGE SOLENOID VALVE REMOVAL/INSTALLATION

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1. Disconnect the negative battery cable.
2. Remove in the order indicated in the table.

3. Install in the reverse order of removal.

Vacuum Hose Installation Note

1. Attach the vacuum hose onto the purge solenoid valve until it contacts the stopper.

Evaporative Hose Installation Note

1. Attach the evaporative hose onto the purge solenoid valve until it contacts the stopper.

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EMISSION SYSTEM

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1

Evaporative hose (to charcoal canister)
(See 

F–38 Evaporative Hose Installation Note

)

2

Vacuum hose (to intake manifold)
(See 

F–38 Vacuum Hose Installation Note

)

3

Purge solenoid valve

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EMISSION SYSTEM 

F–39

F

PURGE SOLENOID VALVE INSPECTION

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Airflow Inspection

Note

• Perform the following test only when directed.

1. Disconnect the negative battery cable.
2. Remove the purge solenoid valve. (See 

F–38 PURGE SOLENOID VALVE REMOVAL/INSTALLATION

.)

3. Inspect airflow between the ports under the following conditions.

• If not as specified, replace the purge solenoid valve.

• If as specified, carry out the “Circuit Open/Short Inspection”.

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See 

F–43 PCM REMOVAL/INSTALLATION

.)

2. Inspect the following wiring harness for open or 

short (continuity check).
Open circuit

• If there is no continuity, the circuit is open. 

Repair or replace the harness.
— Purge solenoid valve terminal A 

(harness-side) and PCM terminal 4U

— Purge solenoid valve terminal B 

(harness-side) and main relay terminal C 
(harness-side)

Short circuit

• If there is continuity, the circuit is shorted. 

Repair or replace the harness.
— Purge solenoid valve terminal A 

(harness-side) and body GND

— Purge solenoid valve terminal B (harness-side) and power supply

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EGR VALVE REMOVAL/INSTALLATION

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1. Disconnect the negative battery cable.
2. Disconnect the EGR valve connector.
3. Remove in the order indicated in the table.

4. Install in the reverse order of removal.

Water Hose Removal Note

• Drain the engine coolant. (See 

E–4 ENGINE 

COOLANT REPLACEMENT

.)

EGR Valve Removal Note

1. Remove the air hose. (See 

F–10 INTAKE-AIR 

SYSTEM REMOVAL/INSTALLATION

)

2. Remove the upper radiator hose. (See 

E–6 RADIATOR REMOVAL/INSTALLATION

.)

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1

Water hose
(See 

F–39 Water Hose Removal Note

)

2

EGR  valve
(See 

F–39 EGR Valve Removal Note

)

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