MAZDA 6 2002 Workshop Manual Suplement

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–49
T
22DETERMINING THE LOCATION OF A
MALFUNCTION
•Is the malfunctioning part the wiring harness
C?Yes Go to Step 36.
No Go to next step.
23DETERMINING THE LOCATION OF A
MALFUNCTION
•Is the malfunctioning part the wiring harness
B or the TCM?Yes Go to Step 39.
No Go to next step.
24DETERMINING THE LOCATION OF A
MALFUNCTION
•Is the malfunctioning part the wiring harness
A or the PCM?Yes Go to Step 43.
No Go to next step.
25INSPECT INSTRUMENT CLUSTER
CONNECTOR
•Disconnect negative battery cable.
•Disconnect instrument cluster connector.
•Are poor connection detection bars of
instrument cluster connector okay?Yes Go to next step.
No Replace wiring harness.
26INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND 4WD
CONTROL MODULE
•Disconnect 4WD control module connector.
•Inspect the following wiring harness between
4WD control module and instrument cluster
terminals for short to ground, short power
supply, and open circuit:
—H—2W (CAN_L)
—G—2X (CAN_H)
•Is wiring harness okay?Yes Replace instrument cluster, then go to Step 45.
No Replace wiring harness.
27INSPECT 4WD CONTROL MODULE
CONNECTOR
•Disconnect negative battery cable.
•Disconnect 4WD control module connector.
•Is the connector for the 4WD control module
connected correctly?Yes Go to next step.
No Replace wiring harness.
28INSPECT WIRING HARNESS BETWEEN 4WD
CONTROL MODULE AND INSTRUMENT
CLUSTER
•Disconnect instrument cluster connector.
•Inspect the following wiring harness between
4WD control module and instrument cluster
terminals for short to ground, short power
supply, and open circuit:
—H—2W (CAN_L)
—G—2X (CAN_H)
•Is wiring harness okay?Yes Replace 4WD control module, then go to Step 45.
No Replace wiring harness.
29•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 31.
30INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND 4WD CONTROL MODULE
•Disconnect DSC HU/CM connector.
•Inspect the following wiring harness between
DSC HU/CM and 4WD control module
terminals for short to ground, short power
supply, and open circuit:
—AF—H (CAN_L)
—AG—G (CAN_H)
•Is wiring harness okay?Yes Go to Step 45.
No Replace wiring harness. STEP INSPECTION ACTION

T–50
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
31INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND 4WD CONTROL
MODULE
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the following wiring harness between
ABS (ABS/TCS) HU/CM and 4WD control
module terminals for short to ground, short
power supply, and open circuit:
—R—H (CAN_L)
—O—G (CAN_H)
•Is wiring harness okay?Yes Go to Step 45.
No Replace wiring harness.
32INSPECT ABS (ABS/TCS) HU/CM OR DSC
HU/CM CONNECTOR
•Disconnect negative battery cable.
•Disconnect ABS (ABS/TCS) HU/CM or DSC
HU/CM connector.
•Is the connector for the ABS (ABS/TCS) HU/
CM or DSC HU/CM connected correctly?Yes Go to next step.
No Replace wiring harness.
33•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 35.
34INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND 4WD CONTROL MODULE
•Disconnect DSC HU/CM connector.
•Inspect the following wiring harness between
DSC HU/CM and 4WD control module
terminals for short to ground, short power
supply, and open circuit:
—AF—H (CAN_L)
—AG—G (CAN_H)
•Is wiring harness okay?Yes Replace DSC HU/CM, then go to Step 45.
No Replace wiring harness.
35INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND 4WD CONTROL
MODULE
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the following wiring harness between
ABS (ABS/TCS) HU/CM and 4WD control
module terminals for short to ground, short
power supply, and open circuit:
—R—H (CAN_L)
—O—G (CAN_H)
•Is wiring harness okay?Yes Replace ABS (ABS/TCS) HU/CM, then go to Step 45.
No Replace wiring harness.
36•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 38.
37INSPECT WIRING HARNESS BETWEEN TCM
AND DSC HU/CM
•Disconnect TCM connector.
•Inspect the following wiring harness between
TCM and DSC HU/CM terminals for short to
ground, short power supply, and open circuit:
—2J—AF (CAN_L)
—2M—AG (CAN_H)
•Is wiring harness okay?Yes Go to Step 45.
No Replace wiring harness.
38INSPECT WIRING HARNESS BETWEEN TCM
AND ABS (ABS/TCS) HU/CM
•Disconnect TCM connector.
•Inspect the following wiring harness between
TCM and ABS (ABS/TCS) HU/CM terminals
for short to ground, short power supply, and
open circuit:
—2J—R (CAN_L)
—2M—O (CAN_H)
•Is wiring harness okay?Yes Go to Step 45.
No Replace wiring harness. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–51
T
End Of Sie
39INSPECT TCM CONNECTOR
•Disconnect negative battery cable.
•Disconnect TCM connector.
•Is the connector for the TCM connected
correctly?Yes Go to next step.
No Replace wiring harness.
40•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 42.
41INSPECT WIRING HARNESS BETWEEN TCM
AND DSC HU/CM
•Disconnect DSC HU/CM connector.
•Inspect the following wiring harness between
TCM and DSC HU/CM terminals for short to
ground, short power supply, and open circuit:
—2J—AF (CAN_L)
—2M—AG (CAN_H)
•Is wiring harness okay?Yes Replace TCM, then go to Step 45.
No Replace wiring harness.
42INSPECT WIRING HARNESS BETWEEN TCM
AND ABS (ABS/TCS) HU/CM
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the following wiring harness between
TCM and ABS (ABS/TCS) HU/CM terminals
for short to ground, short power supply, and
open circuit:
—2J—R (CAN_L)
—2M—O (CAN_H)
•Is wiring harness okay?Yes Replace TCM, then go to Step 45.
No Replace wiring harness.
43INSPECT PCM CONNECTOR
•Disconnect negative battery cable.
•Disconnect PCM connector.
•Is the connector for the PCM connected
correctly?Yes Go to next step.
No Replace wiring harness.
44INSPECT WIRING HARNESS BETWEEN TCM
AND PCM
•Disconnect TCM connector.
•Inspect the following wiring harness between
TCM and PCM terminals for short to ground,
short power supply, and open circuit:
—2J—2R (CAN_L)
—2M—2U (CAN_H)
•Is wiring harness okay?Yes Replace PCM, then go to next step.
No Replace wiring harness.
45CHECK DTC INDICATE
•Connect PCM connector.
•Connect TCM connector.
•Connect ABS (ABS/TCS) HU/CM or DSC
HU/CM connector.
•Connect 4WD control module connector.
•Connect instrument cluster connector.
•Clear DTC from module memory using SST
(WDS or equivalent).
•Perform KOEO/KOER self-test.
•Are DTC’s U0073, U1900 and/or U2516
indicated?Yes Repeat from Step 18.
No Troubleshooting completed. STEP INSPECTION ACTION

U–1
U
UHEATER AND AIR CONDITIONER SYSTEMS
OUTLINE................................................................ U-2
OUTLINE OF CONSTRUCTION.......................... U-2
FEATURES .......................................................... U-2
SPECIFICATIONS ............................................... U-2
CONTROL SYSTEM............................................... U-6
WATER HEATER SYSTEM................................. U-6
OUTLINE................................................................ U-7
SUPPLEMENTAL SERVICE INFORMATION .....U-7
LOCATION INDEX.................................................U-8
BASIC SYSTEM................................................... U-8
CONTROL SYSTEM ............................................ U-9
BASIC SYSTEM................................................... U-10
A/C UNIT REMOVAL/INSTALLATION...............U-10
A/C COMPRESSOR
REMOVAL/INSTALLATION ............................U-11
CONDENSER REMOVAL/INSTALLATION ....... U-12
REFRIGERANT LINES
REMOVAL/INSTALLATION ............................U-13
CONTROL SYSTEM............................................. U-15
WATER HEATER UNIT
REMOVAL/INSTALLATION ............................U-15
FUEL PUMP (WATER HEATER SYSTEM)
INSPECTION .................................................. U-16
CLIMATE CONTROL UNIT INSPECTION.........U-16
ON-BOARD DIAGNOSTIC...................................U-22
FOREWORD ......................................................U-22
DTC TABLE ................................................... U-22-2
PID/DATA MONITOR AND RECORD ........... U-22-2
DTC B1317 .................................................... U-22-3
DTC B1318 ........................................................ U-23
DTC B1342, B2463, B2537, B2538, B2547 ....... U-23
DTC B2449, B2450 ............................................ U-24
DTC B2451, B2452 ............................................ U-24
DTC B2453, B2454 ............................................ U-25
DTC B2548 ........................................................ U-25
TROUBLESHOOTING.......................................... U-26
FOREWORD ......................................................U-26
TROUBLESHOOTING INDEX ...........................U-26 FEATURES
SERVICE

U–2
OUTLINE
OUTLINE OF CONSTRUCTIONA6E850201038201•The construction and operation of the air conditioner system is essentially carried over from that of the previous
Mazda6 (GG) model, except for the following features. (See Mazda6 Training Manual 3359-1*-02C.)
End Of Sie
FEATURESA6E850201038202Improved Comfort
•The water heater system has been adopted. (For MZR-CD (RF Turbo) European (L.H.D.) specs.)
End Of Sie
SPECIFICATIONSA6E850201038203Manual Air Conditioner
OUTLINE
ItemSpecification
L3, L8, LF MZR-CD (RF Turbo)
Heating capacity (kW {kcal/h}) 4.400 {3,784}4.400 {3,784} (L.H.D.)
5.120 {4,403} (R.H.D.)
Airflow volume
(during heater operation)Blower motor
(m
3/h)310 (L.H.D.)
300 (R.H.D.)
Electricity consumption
(during heater operation)Blower motor (W) 184
Cooling capacity (kW {kcal/h}) 4.200 {3,612}
Airflow volume (during air
conditioner operation)Blower motor
(m
3/h)460
Electricity consumption
(during air conditioner
operation)Blower motor (W) 225
Magnetic clutch (W) 46 45
Fan type Blower motor Sirocco fan
RefrigerantType R-134a
Regular amount
(approximate quantity)470 {16.6} (L.H.D.)
430 {15.2} (R.H.D.)
(g {oz})
A/C compressorType Vane-rotary
Discharge capacity
120 {120, 4.06}
(ml {cc, fl oz})
Max. allowable speed
6,400
(rpm)
Lube
oilType ATMOS GU10
Sealed volume
(approximate quantity)
120 {120, 4.06} 150 {150, 5.07}
(ml {cc, fl oz})
Magnetic clutch clearance
0.3—0.5 {0.012—0.019}
(mm {in})
CondenserType Multiflow (sub-cooling type)
Radiated heat (kW {kcal/h})4.69 {4,030}: European (L.H.D.) specs.
5.96 {5,130}: European (U.K.), GCC specs.
Receiver/drier
capacity(ml {cc, fl oz}) 190 {190, 6.42}
Desiccant Synthetic zeolite
Expansion valve Type Block type
Evaporator Type Double-tank drawn cup

OUTLINE
U–3
U
Bold frames: New specification
Refrigerant pressure
switchType Dual-pressure: General area
Operating pressure
(MPa {kgf/cm
2, psi})
TypeTriple-pressure: L3 engine,
intensely hot area
– Operating pressure
(MPa {kgf/cm
2, psi})
Thermal protectorType Bimetallic (Indirect sensing type)
Operating temperature
(°C {°F})
Temperature control Reheat full air mix typeItemSpecification
L3, L8, LF MZR-CD (RF Turbo)
ON
OFF0.166—0.226
{1.693—2.304,
24.08—32.77}2.94—3.34
{30.0—34.0,
427—483}
0.02
{0.20, 2.84}
or less0.39—0.79
{3.98—8.05,
56.6—114}
0.195—0.250
{1.989—2.549, 28.30—36.24}
ON
OFF
ON
OFF  HI and LO pressure switch
 Middle pressure switch0.176—0.216
{1.795—2.202,
25.53—31.31}2.94—3.34
{30.0—34.0,
427—483}
0.02 {0.20,
2.84} or less0.39—0.79
{3.98—8.05,
56.6—114}
0.195—0.250 {1.989—2.549,
28.30—36.24}
1.08—1.38
{11.1—14.0, 158—199}
1.39—1.65
{14.2—16.8,
202—238}
ON
OFF145—155
{293—311}:
European
(L.H.D. U.K.)
specs.
150—155
{302—311}:
GCC specs.
123—137 {254—278}
ON
OFF135—145
{275—293}
113—127 {236—260}

U–4
OUTLINE
Full-auto Air Conditioner
ItemSpecification
L3, L8, LF MZR-CD (RF Turbo)
Heating capacity (kW {kcal/h}) 4.400 {3,784}4.400 {3,784} (L.H.D.)
5.120 {4,403} {R.H.D.)
Airflow volume
(during heater operation)Blower motor
(m
3/h)310 (L.H.D.)
300 (R.H.D.)
Electricity consumption
(during heater operation)Blower motor (W) 184
Cooling capacity (kW {kcal/h}) 4.200 {3,612}
Airflow volume (during air
conditioner operation)Blower motor
(m
3/h)460
Electricity consumption
(during air conditioner
operation)Blower motor (W) 225
Magnetic clutch (W) 46 45
Fan type Blower motor Sirocco fan
RefrigerantType R-134a
Regular amount
(approximate quantity)470 {16.6} (L.H.D.)
430 {15.2} (R.H.D.)
(g {oz})
A/C compressorType Vane-rotary
Discharge capacity
120 {120, 4.06}
(ml {cc, fl oz})
Max. allowable speed
6,400
(rpm)
Lube
oilType ATMOS GU10
Sealed volume
(approximate quantity)
120 {120, 4.06} 150 {150, 5.07}
(ml {cc, fl oz})
Magnetic clutch clearance
0.3—0.5 {0.012—0.019}
(mm {in})
CondenserType Multiflow (sub-cooling type)
Radiated heat (kW {kcal/h})4.69 {4,030}: European (L.H.D.) specs.
5.96 {5,130}: European (U.K.), GCC specs.
Receiver/drier
capacity(ml {cc, fl oz}) 190 {190, 6.42}
Desiccant Synthetic zeolite
Expansion valve Type Block type
Evaporator Type Double-tank drawn cup

OUTLINE
U–5
U
Bold frames: New specificationEnd Of Sie
Refrigerant pressure
switchType Dual-pressure: General area
Operating pressure
(MPa {kgf/cm
2, psi})
TypeTriple-pressure: L3 engine,
intensely hot area
– Operating pressure
(MPa {kgf/cm
2, psi})
Thermal protectorType Bimetallic (Indirect sensing type)
Operating temperature
(°C {°F})
SensorSolar radiation sensor Photodiode
Ambient temperature sensor
Thermistor Cabin temperature sensor
Evaporator temperature
sensor
Water temperature sensor
ActuatorAir intake actuator Sliding contact type
Air mix actuator, airflow mode
actuatorPotentiometer type
Temperature control Reheat full air mix typeItemSpecification
L3, L8, LF MZR-CD (RF Turbo)
ON
OFF0.166—0.226
{1.693—2.304,
24.08—32.77}2.94—3.34
{30.0—34.0,
427—483}
0.02
{0.20, 2.84}
or less0.39—0.79
{3.98—8.05,
56.6—114}
0.195—0.250
{1.989—2.549, 28.30—36.24}
ON
OFF
ON
OFF  HI and LO pressure switch
 Middle pressure switch0.176—0.216
{1.795—2.202,
25.53—31.31}2.94—3.34
{30.0—34.0,
427—483}
0.02 {0.20,
2.84} or less0.39—0.79
{3.98—8.05,
56.6—114}
0.195—0.250 {1.989—2.549,
28.30—36.24}
1.08—1.38
{11.1—14.0, 158—199}
1.39—1.65
{14.2—16.8,
202—238}
ON
OFF145—155
{293—311}:
European
(L.H.D. U.K.)
specs.
150—155
{302—311}:
GCC specs.
123—137 {254—278}
ON
OFF135—145
{275—293}
113—127 {236—260}

U–6
CONTROL SYSTEM
WATER HEATER SYSTEMA6E854000169201Outline
•The function, structure and operation of the water heater system is essentially carried over from that of the
current MPV (LW) model, except for following:
—Full/half switching temperature has been changed.
Structural View
.
Operation
Full/half switching
•Depending on the engine coolant temperature, the CPU sets the flame to either full or half strength settings.
.
End Of Sie
CONTROL SYSTEM
1
2
A6E85402002
1 Water heater unit2 Fuel pump (water heater system)
3
1
2
68
{154}74
{165}75
{167}78
{172}˚C
{˚F}
A6E85402003
1 Full mode
2 Half mode3 Idle mode

OUTLINE
U–7
U
SUPPLEMENTAL SERVICE INFORMATIONA6E850201038204•The following additions have been made for the MZR-CD (RF Turbo) since the publication of the Mazda6
Workshop Manual (1730-1*-02C).
A/C unit
•Removal/installation procedure has been modified.
A/C compressor
•Removal/installation procedure has been modified.
Condenser
•Removal/installation procedure has been modified.
Refrigerant lines
•Removal/installation procedure has been modified.
Water heater unit
•Removal/installation procedure has been added.
Fuel pump (water heater system)
•Inspection procedure has been added.
Climate control unit
•Inspection procedure has been modified.
Water heater system
•On-board diagnostic system has been added.
End Of Sie
OUTLINE