2002 MAZDA 6 Workshop Manual Suplement

T–6
MULTIPLEX COMMUNICATION SYSTEM
ON-BOARD DIAGNOSTIC FUNCTIONA6E811155430205Outline
•The on-board diagnostic function is incorporated into the PCM, TCM, ABS (ABS/TCS) HU/CM (with ABS (ABS/
TCS)), DSC HU/CM (with DSC), 4WD control module, and instrument cluster. This function can narrow down
CAN system malfunction locations.
•Due to the adoption of the TCM and the 4WD CM, some DTCs and PID/data monitor items have been added.
Other functions are the same as those of the current Mazda6 (GG) model.
Block Diagram
.
Fail-Safe Function
•When the failure detection function detemines that there is a malfunction, the fail-safe function illuminates a
warning light to advise the driver of the malfunction.
1
3
24
5
6
A6E81111103
1PCM
2 TCM (JA5AX-EL)
3 ABS (ABS/TCS) HU/CM or DSC HU/CM4 4WD control module (4WD)
5 Instrument cluster
6Twist pair
Module Fail-safe function
PCM•MIL illuminated
TCM•AT warning light illuminated
•ABS (ABS/TCS) HU/CM (with ABS (ABS/TCS))
•DSC HU/CM (with DSC)•ABS (ABS/TCS) suspended (with ABS (ABS/TCS))
•DSC suspended (with DSC)
•ABS warning light illuminated
•DSC/TCS indicator light illuminated
•DSC OFF light illuminated
•TCS OFF light illuminated
4WD control module•4WD indicator light illuminated
Instrument cluster•Speedometer, tachometer, water temperature gauge: 0 displayed

MULTIPLEX COMMUNICATION SYSTEM
T–7
T
Self-Malfunction Diagnostic Function
•The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC,
to the DLC-2. The DTC can be read out using an SST (WDS or equivalent).
DTC table
PID/Data Monitoring Function
•The PID/data monitoring function is used to freely select and read out, in real time, the monitored items for the
input/output signals of the TCM, ABS (ABS/TCS) HU/CM, DSC HU/CM and instrument cluster.
•An SST (WDS or equivalent) is used to read out the PID/data monitor information.
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DTC Malfunction location Related module
U0073 CAN system communication error•PCM
•TCM
U0100 Communication error to PCM•TCM
•4WD control module
U0101 Communication error to TCM
•PCM
•4WD control module
U0121 Communication error to ABS (ABS/TCS) HU/CM or DSC HU/CM
U0155 Communication error to instrument cluster PCM
U1900 CAN system communication error•ABS (ABS/TCS) HU/CM (with ABS (ABS/
TCS))
•DSC HU/CM (with DSC)
•Instrument cluster
U2511 Communication error to 4WD control module•ABS (ABS/TCS) HU/CM (with ABS (ABS/
TCS))
•DSC HU/CM (with DSC)
U2516 CAN system wiring harness open and short circuit•ABS (ABS/TCS) HU/CM (with ABS (ABS/
TCS))
•DSC HU/CM (with DSC)
•Instrument cluster
PID name
(definition)Condition Specification Related module Terminal
PCM_MSG
(Missing message
from the PCM)Present Circuit in the PCM is normal•TCM
•ABS (ABS/TCS)
HU/CM or DSC
HU/CM
•Instrument cluster
•TCM: 2J, 2M
•ABS (ABS/TCS) HU/CM
(with ABS (ABS/TCS)): O,
R
•DSC HU/CM (with DSC):
AF, AG
•Instrument cluster: 2W, 2X Not Present Circuit in the PCM is abnormal
TCM_MSG
(Missing message
from the TCM)Present Circuit in the TCM is normal•ABS (ABS/TCS)
HU/CM or DSC
HU/CM
•Instrument cluster Not Present Circuit in the TCM is abnormal
ABS_MSG
(Missing message
from the ABS
(ABS/TCS) HU/
CM or DSC HU/
CM)PresentCircuit in the ABS (ABS/TCS)
HU/CM or DSC HU/CM is
normal
•TCM
•Instrument cluster
Not PresentCircuit in the ABS (ABS/TCS)
HU/CM or DSC HU/CM is
abnormal
AWD_MSG
(Missing message
from the 4WD
control module)PresentCircuit in the 4WD control
module is normal•TCM
•ABS (ABS/TCS)
HU/CM or DSC
HU/CM
•Instrument cluster Not PresentCircuit in the 4WD control
module is abnormal
IC_MSG
(Missing message
from the
instrument
cluster)PresentCircuit in the instrument cluster
is normal•TCM
•ABS (ABS/TCS)
HU/CM or DSC
HU/CM Not PresentCircuit in the instrument cluster
is abnormal

T–8
EXTERIOR LIGHTING SYSTEM, INTERIOR LIGHTING SYSTEM
OUTLINEA6E811201052201•In-vehicle-type high-mount brake light and rear spoiler type high-mount brake light have been adopted. (WGN)
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STRUCTURAL VIEWA6E811201052202
.
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STRUCTURAL VIEWA6E811401052201
.
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EXTERIOR LIGHTING SYSTEM
2
1
A6E8112T101
1 High-mount brake light (in-vehicle-type)2 High-mount brake light (rear spoiler type)
INTERIOR LIGHTING SYSTEM
FRONT
1
A6E81141001
1 Cargo compartment light

WIPER AND WASHER
T–9
T
OUTLINEA6E811601052201•Due to the adoption of the WGN, the following have been changed:
—Installation positions of the rear wiper arm and blade, rear wiper motor, rear washer nozzle and intermittent
rear wiper relay
—Rear washer hose routing
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STRUCTURAL VIEWA6E811601052202
.
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WIPER AND WASHER
21aa
1
3
54
A6E81161107
1 Rear washer hose
2 Rear washer nozzle
3 Rear wiper arm and blade4 Rear wiper motor
5 Intermittent rear wiper relay

T–10
WARNING AND INDICATOR SYSTEM
OUTLINEA6E811801069201•In accordance with the 4WD setting, the following indicator light has been added:
—4WD indicator light
•In accordance with the MZR-CD (RF Turbo) setting, the following indicator lights have been added:
—Glow indicator light
—Sedimentor warning light
•A fuel gauge sender sub-unit has been adopted. (4WD)
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STRUCTURAL VIEWA6E811801069202
.
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WARNING AND INDICATOR SYSTEM
3
2
1
4
5
4WD
A6E81181101
1 Sedimentor warning light
2 4WD indicator light
3 Glow indicator light4 Fuel gauge sender unit
5 Fuel gauge sender sub-unit

WARNING AND INDEICATOR SYSTEM, THEFT-DETERRENT SYSTEM
T–11
T
SYSTEM WIRING DIAGRAMA6E811801069203
.
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OUTLINEA6E812050000201•An intruder sensor has been adopted on the rear part of the roof. (WGN)
•The construction and operation of the theft-deterrent system is the same as that of the current Mazda6 (GG)
model.
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INTRUDER SENSORA6E812050000202Outline
•WGN models are equipped with intruder sensors in two places in the vehicle, due to the necessity of movement
detection in the all around wider vehicle interior. The intruder sensors are located in the roof at the front (with
sliding sunroof), or the center (without sliding sunroof), and the cargo space.
•The structure and operation of the rear intruder sensor is the same as that of the current front and center
intruder sensors.
IG1
B+
1
345
2
6
97
8
2H 2V
1C 2F 2D 2M 2X 2W
A6E81181004
1 Instrument cluster
2Microcomputer
3 Glow indicator light
4 Sedimentor warning light
5 4WD indicator light6 PCM, ABS (ABS/TCS) HU/CM or DSC HU/CM
7 Fuel gauge sender sub-unit (4WD)
8 Fuel gauge sender unit
9 Sedimentor switch
THEFT-DETERRENT SYSTEM

T–12
THEFT-DETERRENT SYSTEM
Structural View
.
System Wiring Diagram
.
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3
1
2
A6E81201103
1 Front intruder sensor (with sliding sunroof)
2 Center intruder sensor (without sliding sunroof)3 Rear intruder sensor (WGN)
B+ IG1
F
PA
B
C
1
2
CB
A
B O
C
3
L
A6E81201101
1 Theft-deterrent control module
2 Rear intruder sensor (WGN)3 Front intruder sensor (with sliding sunroof)
Center intruder sensor (without sliding sunroof)

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
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STRUCTURAL VIEWA6E812401052202
.
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OUTLINEA6E812801052201•The PCM controls the cruise control system. Refer to Section F for details regarding PCM control. (SeeF2–23
CRUISE CONTROL SYSTEM)
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OUTLINEA6E813001046201•Due to the adoption of the WGN, the shape of the curtain air bag module has been modified.
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AUDIO AND NAVIGATION SYSTEM
1
2
3
A6E8124T101
1 Rear antenna feeder
2 Condenser3 Noise filter
CRUISE CONTROL SYSTEM
AIR BAG SYSTEM