2002 MAZDA 6 air filter

F2–196
TROUBLESHOOTING
3 Perform self-test function using WDS or
equivalent.
Turn engine switch to ON.
Retrieve any DTC.
Is DTC displayed?YesDTC is displayed:
Go to appropriate DTC test.
Communication error message is displayed:
Inspect for following:
•Open circuit between PCM control relay and PCM
terminal 53 or 79
•Open circuit PCM control relay and PCM terminal
69
•PCM control relay stuck open
•Open or poor GND circuit (PCM terminal 65, 85,
103 or 104)
•Poor connection vehicle body GND
NoNo DTC is displayed:
Go to next step.
4 Inspect for following:
•Fuel quality (e.g.: including water
contamination, winter/summer blend)
•Fuel line/fuel filter clogging and/or restriction
•Intake-air system restriction
•Exhaust system and/or catalyst converter
restriction
•Charge air cooler condition (restriction or
damaged)
•Vacuum leakage
•Cooling fan No.1 and cooling fan No.2 seat
Are all items okay?Yes Go to next step.
No Service as necessary.
Repeat Step 4.
5 Inspect intake shutter valve and VSC valve
operations.
(See F2–229 ENGINE CONTROL SYSTEM
OPERATION INSPECTION)
Is there any problem?Yes Repair or replace as necessary.
No Go to next step.
6 Inspect guide blade valve operation.
(See F2–229 ENGINE CONTROL SYSTEM
OPERATION INSPECTION)
Is there any problem?Yes Repair or replace as necessary.
No Go to next step.
7 Inspect A/C cut-off operation.
Does A/C cut-off work properly?Yes Go to next step.
No Repair or replace malfunctioning part according to A/C
cut-off system inspection results.
8 Inspect hose bands between following parts:
•Turbocharger compressor housing and air
cleaner
•Turbocharger compressor housing and
charge air cooler
Are hose bands loose?Yes Retighten hose bands.
If concern is resolved, complete inspection.
If concern still exists, go to next step.
No Go to next step.
9 Inspect for improper operation, kinks, clogging or
disconnection on guide blade actuator.
(See F2–229 ENGINE CONTROL SYSTEM
OPERATION INSPECTION)
Is actuator okay?Yes Go to next step.
No Repair or replace as necessary.
If concern is resolved, complete inspection.
If concern still exists, turbocharger is okay.
Go to next step.
10 Remove parts necessary to inspect
turbocharger.
Do not remove turbocharger.
Inspect if turbocharger compressor wheel is
bent, damaged, or interfering with housing on
vehicle.
Is there any problem?Yes Replace turbocharger.
No Go to next step.
11 Inspect if turbocharger compressor wheel
locknut is loose or has fallen down inside
turbocharger.
Is there any problem?Yes Replace turbocharger.
No Go to next step.
12 Inspect if turbocharger compressor wheel by
hand.
Does wheel turn easily and smoothly?Yes Go to next step.
No Replace turbocharger. STEP INSPECTION RESULTS ACTION

F2–202
TROUBLESHOOTING
NO.14 POOR FUEL ECONOMYA6E408018881216
Diagnostic Procedure
14 POOR FUEL ECONOMY
DESCRIPTION•Fuel economy is unsatisfactory.
POSSIBLE
CAUSE•Incorrect idle speed
•A/C system improper operation
•Intake -air system clogging or restriction
•Engine cooling system malfunction
•Poor fuel quality
•Improper coolant level
•Erratic signal from CKP sensor
•Erratic signal from CMP sensor
•Fuel pressure sensor or related circuit malfunction
•ECT sensor or related circuit malfunction
•Boost sensor or related circuit malfunction
•Accelerator position sensor or related circuit malfunction
•Incorrect adjustment idle switch
•MAF/IAT sensor or related circuit malfunction
•IAT sensor No .2 or related circuit malfunction
•VSS or related circuit malfunction
•Turbocharger malfunction
•Charge air cooler malfunction
•Low engine compression
•Improper valve timing
•Exhaust system and/or catalyst converter clogging
•Incorrect fuel injection timing
•Fuel injector malfunction
•Supply pump malfunction
•Fuel leakage
•Fuel line clogging or restriction
•Fuel filter clogging or restriction
•Brake dragging
•EGR system malfunction
•Vacuum leakage
•Clutch slippage
•Variable boost control (VBC) system malfunction
•Coolant heater system malfunction
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
•Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep
sparks and flames away from fuel.
•Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death
and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE
REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this manual.
STEP INSPECTION RESULTS ACTION
1 Inspect for following:
•Fuel quality (e.g.: including water
contamination, winter/summer blend)
•Fuel line/fuel filter clogging and/or restriction
•Fuel line leakage
•Intake-air system restriction
•Exhaust system and/or catalyst converter
restriction
•Charge air cooler condition (restriction or
damaged)
•Vacuum leakage
Are all items okay?Yes Go to next step.
No Service as necessary.
Repeat Step 1.
2 Is brake system functioning properly? Yes Go to next step.
No Inspect for cause.

F2–216
TROUBLESHOOTING
NO.20 FUEL ODOR (IN ENGINE COMPARTMENT)A6E408018881222
Diagnostic Procedure
End Of Sie
20 FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION•Fuel smell or visible leakage.
POSSIBLE
CAUSE•Excessive fuel pressure
•Suction control valve malfunction (built-in supply pump)
•Fuel pressure limiter malfunction (built-in common rail)
•Fuel pressure sensor or related circuit malfunction
•Fuel leakage
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
•Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep
sparks and flames away from fuel.
•Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death
and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE
REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this manual.
STEP INSPECTION RESULTS ACTION
1 Visually inspect fuel leakage at fuel injector and
fuel line.
Is there any fuel leakage?Yes Service as necessary.
No Go to next step.
2 Visually inspect for damaged or cracked fuel
filter.
Is fuel filter okay?Yes Go to next step.
No Replace fuel filter.
3 Inspect fuel pressure sensor.
(See F2–79 FUEL PRESSURE SENSOR
INSPECTION)
Is fuel pressure okay?Yes Go to next step.
No Repair or replace as necessary.
4 Inspect suction control valve.
(See F2–54 SUCTION CONTROL VALVE
INSPECTION)
Is suction control valve okay?Yes Go to next step.
No Repair supply pump.
(See F2–54 SUPPLY PUMP INSPECTION)
5 Perform self-test function using WDS or
equivalent.
Turn engine switch to ON.
Retrieve any DTC.
Is DTC displayed?YesDTC is displayed:
Go to appropriate DTC test.
Communication error message is displayed:
Inspect for following:
•Open circuit between PCM control relay and PCM
terminal 53 or 79
•Open circuit PCM control relay and PCM terminal
69
•PCM control relay stuck open
•Open or poor GND circuit (PCM terminal 65, 85,
103 or 104)
•Poor connection vehicle body GND
NoNo DTC is displayed:
Remove and inspect common rail.
6 Verify test results.
•If okay, return to diagnostic index to service any additional symptoms.
•If malfunction remains, replace PCM. (See F2–64 PCM REMOVAL/INSTALLATION)

STARTING SYSTEM
G–9
G
STARTER REMOVAL/INSTALLATIONA6E471418400202
Warning
•When the battery cables are connected, touching the vehicle body with starter terminal B will
generate sparks. This can cause personal injury, fire, and damage to the electrical components.
Always disconnect the battery negative cables before performing the following operation.
1. Disconnect the negative battery cable.
2. Remove the plug hole plate. (L8, LF, and L3 engine models)
3. Remove the engine cover. (MZR-CD (RF Turbo) engine model) (See B2–9 TIMING BELT REMOVAL/
INSTALLATION.)
4. Remove the air cleaner assembly. (L8, LF, and L3 engine models).
5. Remove the under cover.
6. Remove the oil filter and oil cooler component with the cooling hose connected. Position the oil filter and oil
cooler component so that it is out of the way. (L3 engine model (4WD))
7. Remove the solenoid valve assembly with the vacuum hose and the connector connected. Position the
solenoid valve assembly so that it is out of the way. (MZR-CD (RF Turbo) engine model)
8. Remove the release cylinder with the oil pipe connected. Position the release cylinder so that it is out of the
way. (MTX)
9. Remove in the order indicated in the table.
10. Install in the reverse order of removal.
STARTING SYSTEM

T–1
T
TBODY ELECTRICAL SYSTEM
OUTLINE................................................................ T-2
OUTLINE OF CONSTRUCTION ......................... T-2
FEATURES .......................................................... T-2
POWER SYSTEM................................................... T-2
STRUCTURAL VIEW........................................... T-2
MULTIPLEX COMMUNICATION SYSTEM............ T-3
OUTLINE ............................................................. T-3
STRUCTRURAL VIEW ........................................ T-3
SYSTEM WIRING DIAGRAM .............................. T-4
CAN SIGNAL-CHART.......................................... T-4
ON-BOARD DIAGNOSTIC FUNCTION............... T-6
EXTERIOR LIGHTING SYSTEM............................ T-8
OUTLINE ............................................................. T-8
STRUCTURAL VIEW........................................... T-8
INTERIOR LIGHTING SYSTEM............................. T-8
STRUCTURAL VIEW........................................... T-8
WIPER AND WASHER........................................... T-9
OUTLINE ............................................................. T-9
STRUCTURAL VIEW........................................... T-9
WARNING AND INDICATOR SYSTEM............... T-10
OUTLINE ........................................................... T-10
STRUCTURAL VIEW......................................... T-10
SYSTEM WIRING DIAGRAM ............................ T-11
THEFT-DETERRENT SYSTEM............................ T-11
OUTLINE ........................................................... T-11
INTRUDER SENSOR ........................................ T-11
AUDIO AND NAVIGATION SYSTEM.................. T-13
OUTLINE ........................................................... T-13
STRUCTURAL VIEW......................................... T-13
CRUISE CONTROL SYSTEM.............................. T-13
OUTLINE ........................................................... T-13
AIR BAG SYSTEM............................................... T-13
OUTLINE ........................................................... T-13
OUTLINE.............................................................. T-14
SUPPLEMENTAL SERVICE INFORMATION ... T-14
LOCATION INDEX............................................... T-15
POWER SYSTEM.............................................. T-15
EXTERIOR LIGHTING SYSTEM ....................... T-15
INTERIOR LIGHTING SYSTEM ........................ T-16
WIPER AND WASHER SYSTEM ...................... T-16
WARNING AND INDICATOR SYSTEM............. T-17
THEFT-DETERRENT SYSTEM ........................ T-17
AUDIO AND NAVIGATION SYSTEM ................ T-18
AIR BAG SYSTEM............................................. T-18
POWER SYSTEM................................................. T-19
RELAY LOCATION ............................................ T-19
RELAY INSPECTION ........................................ T-19
EXTERIOR LIGHTING SYSTEM.......................... T-20
REAR AUTO LEVELING SENSOR
REMOVAL/INSTALLATION ............................ T-20HIGH-MOUNT BRAKE LIGHT
REMOVAL/INSTALLATION ............................ T-20
INTERIOR LIGHTING SYSTEM........................... T-21
CARGO COMPARTMENT LIGHT
REMOVAL/INSTALLATION ............................ T-21
CARGO COMPARTMENT LIGHT
INSPECTION .................................................. T-22
WIPER AND WASHER......................................... T-22
REAR WIPER MOTOR
REMOVAL/INSTALLATION ............................ T-22
REAR WIPER MOTOR INSPECTION ............... T-22
REAR WIPER ARM AND BLADE
REMOVAL/INSTALLATION ............................ T-23
REAR WIPER ARM AND BLADE
ADJUSTMENT ................................................ T-24
REAR WASHER NOZZLE
REMOVAL/INSTALLATION ............................ T-24
REAR WASHER NOZZLE ADJUSTMENT ........ T-25
REAR WASHER HOSE
REMOVAL/INSTALLATION ............................ T-25
INTERMITTENT REAR WIPER RELAY
REMOVAL/INSTALLATION ............................ T-26
WARNING AND INDICATOR SYSTEM............... T-27
FUEL GAUGE SENDER UNIT
REMOVAL/INSTALLATION ............................ T-27
FUEL GAUGE SENDER UNIT INSPECTION.... T-28
THEFT-DETERRENT SYSTEM............................ T-29
INTRUDER SENSOR
REMOVAL/INSTALLATION ............................ T-29
AUDIO AND NAVIGATION SYSTEM.................. T-30
NOISE FILTER REMOVAL/INSTALLATION ..... T-30
CONDENSER REMOVAL/INSTALLATION ....... T-30
ANTENNA FEEDER LOCATION ....................... T-31
REAR ANTENNA FEEDER INSPECTION ........ T-31
AIR BAG SYSTEM............................................... T-32
SERVICE WARNINGS....................................... T-32
CURTAIN AIR BAG MODULE
REMOVAL/INSTALLATION ............................ T-35
AIR BAG MODULE AND PRE-TENSIONER
SEAT BELT DEPLOYMENT PROCEDURES. T-35
ON-BOARD DIAGNOSTIC
[MULTIPLEX COMMUNICATION SYSTEM].... T-39
MULTIPLEX COMMUNICATION SYSTEM ....... T-39
DTC TABLE ....................................................... T-41
PID/DATA MONITOR TABLE ............................ T-41
PROCEDURES FOR DETERMINING
THE LOCATION OF A MALFUNCTION ......... T-42
DTC U0073, U1900, U2516 ............................... T-45 FEATURES
SERVICE

AUDIO AND NAVIGATION SYSTEM, CRUISE CONTROL SYSTEM, AIR BAG SYSTEM
T–13
T
OUTLINEA6E812401052201•Due to the adoption of the WGN, the following have been changed:
—Installation positions of the condenser and the noise filter
—Antenna feeder routing
End Of Sie
STRUCTURAL VIEWA6E812401052202
.
End Of Sie
OUTLINEA6E812801052201•The PCM controls the cruise control system. Refer to Section F for details regarding PCM control. (SeeF2–23
CRUISE CONTROL SYSTEM)
End Of Sie
OUTLINEA6E813001046201•Due to the adoption of the WGN, the shape of the curtain air bag module has been modified.
End Of Sie
AUDIO AND NAVIGATION SYSTEM
1
2
3
A6E8124T101
1 Rear antenna feeder
2 Condenser3 Noise filter
CRUISE CONTROL SYSTEM
AIR BAG SYSTEM

T–14
OUTLINE
SUPPLEMENTAL SERVICE INFORMATIONA6E810201088203•The following changes and/or additions have been made since publication of the Mazda6 Workshop Manual
(1730-1*-02C).
Relay
•Location has been changed.
•Inspection procedure has been modified.
Rear auto leveling sensor
•Removal/Installation procedure has been modified.
High-mount brake light
•Removal/Installation procedure has been modified.
Cargo compartment light
•Removal/Installation procedure has been modified.
•Inspection procedure has been modified.
Rear wiper motor
•Removal/Installation procedure has been modified.
•Inspection procedure has been modified.
Rear wiper arm and blade
•Removal/Installation procedure has been modified.
•Adjustment procedure has been modified.
Rear washer nozzle
•Removal/Installation procedure has been modified.
•Adjustment procedure has been modified.
Rear washer hose
•Removal/Installation procedure has been modified.
Intermittent rear wiper relay
•Removal/Installation procedure has been modified.
Fuel gauge sender unit
•Removal/Installation procedure has been modified.
•Inspection procedure has been modified.
Intruder sensor
•Removal/Installation procedure has been modified.
Noise filter
•Removal/Installation procedure has been modified.
Condenser
•Removal/Installation procedure has been modified.
Antenna feeder
•Location has been changed.
Rear antenna feeder
•Inspection procedure has been modified.
Curtain air bag module
•Removal/Installation procedure has been added.
Air bag module and pre-tensioner seat belt
•Deployment procedure has been modified.
On-board diagnostic
•Multiplex communication system procedure has been modified.
End Of Sie
OUTLINE

T–18
LOCATION INDEX
AUDIO AND NAVIGATION SYSTEMA6E810001066201
.
End Of SieAIR BAG SYSTEMA6E810001046201
.
End Of Sie
1
2
3
A6A8124W144
1 Antenna feeder
(See T–31 ANTENNA FEEDER LOCATION)
(See T–31 REAR ANTENNA FEEDER
INSPECTION)2 Noise filter
(See T–30 NOISE FILTER REMOVAL/
INSTALLATION)
3 Condenser
(See T–30 CONDENSER REMOVAL/
INSTALLATION)
1
A6E81301150
1 Curtain air bag module
(See T–35 CURTAIN AIR BAG MODULE
REMOVAL/INSTALLATION)
(See T–35 AIR BAG MODULE AND PRE-
TENSIONER SEAT BELT DEPLOYMENT
PROCEDURES)