wiring MAZDA 6 2002 Workshop Manual Suplement

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–51
T
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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–16
CONTROL SYSTEM
FUEL PUMP (WATER HEATER SYSTEM) INSPECTIONA6E8540133502011. Inspect for continuity between fuel pump terminal
A and B using an ohmmeter.
•If not as specified, replace the fuel pump
(water heater system).
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CLIMATE CONTROL UNIT INSPECTIONA6E854061190201Full-auto Air Conditioner
1. Connect the all center panel connectors.
2. Turn the ignition switch to ON position.
3. Measure the voltage at each climate control unit terminal and refer to the terminal voltage list.
•If not as specified, inspect the parts listed under “Action” and the related wiring harness.
—If there is any malfunction, replace the climate control unit.
Terminal Voltage List (Reference)
AME8540W007
Terminal Signal Connected to Test condition Voltage (V) Action
1A Blower motor
feedback signal•Blower motor
•Power MOS
FETFan switch is OFF 12 1. Inspect for continuity or
short circuit (Climate control
unit—blower motor: 1A—B)
(Climate control unit—power
MOS FET: 1A—B, 1C—E)
(Blower motor—blower
relay: A—C) (Blower relay—
fuse: D—BLOWER 40 A
fuse)
2. Inspect for continuity (Power
MOS FET—ground: A—
GND) (Blower relay—
ground: A—GND)
3. Inspect power MOS FET
4. Inspect blower motor
5. Inspect blower relay
6. Inspect BLOWER 40 A fuse
7. Replace power MOS FET Fan switch is at manual
LO7.8
Fan switch is at manual
HI
0.2
2A
1W
2B 2C
2D 2E
2F 2G
2H 2I 2K
2L
* 1A
1B
* *
* *
* 1X1C 1E
1F * 1I
1K
1M 1O
1P 1Q 1S
1T 1U
1J 1L
A6E85402001

ON-BOARD DIAGNOSTIC
U–22–1
U
U–22H EA TER AND A I R C O NDI T ION ER SYST EMS
After Repair Procedure
1. Connect the SST (WDS or equivalent) to the
vehicle DLC-2 16-pin connector located as shown
in the figure.
2. Turn the ignition switch to the ON position.
3. Perform the DTCs reading procedure and record
any DTCs that are retrieved.
4. Clear the DTCs using the SST (WDS or
equivalent).
5. Verify that the customer’s concern has been
resolved.
Lockout Reset
Using the SST (WDS or equivalent)
1. Connect the SST (WDS or equivalent) to the
vehicle DLC-2 16-pin connector located as shown
in the figure.
2. Select “CLR_LOCKOUT” and “LOCKOUT”.
3. Turn “CLR_LOCKOUT” to ON using the
simulation function.
4. Verify that the “LOCKOUT” reading changes to
“Unlocked”.
Not using the SST (WDS or equivalent)
For factory equipped water heater unit
1. Turn the ignition switch to the OFF position.
2. Remove the HEATER 20 A fuse from the main
fuse block for more than 5 seconds.
3. Re-install the HEATER 20 A fuse.
For vehicles with a transmitter or timer
1. Turn the ignition switch to the OFF position.
2. Remove the power supply 20 A fuse from the
heater wiring harness for approx. 3 seconds.
3. Re-install the power supply 20 A fuse.
4. Press and hold down the ON switch of the
transmitter or timer for approx. 3 seconds.
5. Remove the power supply 20 A fuse from the
heater wiring harness for approx. 3 seconds.
6. Re-install the power supply 20 A fuse.
ON-BOARD DIAGNOSTIC
DLC-2
A6E3970W002
DLC-2
A6E3970W002
HEATER 20 A FUSE
MAIN FUSE
BLOCK
B6E0740TL02
WAIT FOR
APPROX. 3
SECONDS
OR
ON
ONWAIT FOR
APPROX. 3
SECONDS WAIT FOR
APPROX. 3
SECONDS
B6E0740TL03

ON-BOARD DIAGNOSTIC
U–23
U
UHEATER AND AIR CONDITIONER SYSTEMSDTC B1318A6E857001038204
Diagnostic procedure
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DTC B1342, B2463, B2537, B2538, B2547A6E857001038205
Diagnostic procedure
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ON-BOARD DIAGNOSTIC
DTC B1318 Input voltage low
DETECTION
CONDITION•Voltage detected at water heater unit terminals A is less than 9 V.
POSSIBLE
CAUSE•Generator malfunction
•Battery malfunction
STEP INSPECTION ACTION
1INSPECT BATTERY VOLTAGE
•Measure the battery voltage.
•Is the voltage more than 9 V?Yes Go to the next step.
No The battery is weak.
•Inspect the charging system.
2INSPECT WIRING HARNESS BETWEEN W.HEAT
40 A FUSE AND WATER HEATER UNIT
•Turn the ignition switch to the ON position.
•Measure the voltage at water heater unit
connector terminal A.
•Is the voltage more than 9 V?Yes Go to the next step.
No Repair the wiring harness.
3INSPECT WATER HEATER UNIT
•Clear the DTC.
•Perform the KOEO Self Test. (See U–22 KOEO
Self Test/Combustion Test.)
•Is the same DTC present?Yes Replace the water heater unit.
(See U–15 WATER HEATER UNIT REMOVAL/
INSTALLATION)
No Go to the next step.
4VERIFY AFTER REPAIR PROCEDURE
•Perform the after repair procedure. (See U–22–1
After Repair Procedure.)
•Are any DTCs present?Yes Go to the applicable DTC troubleshooting.
No Troubleshooting completed.
A C E
B
D F WATER HEATER UNIT CONNECTOR
DTCB1342 Malfunction in water heater unit
B2463 Overheat
B2537 Water heater system does not start
B2538 Unstable flame
B2547 Flame prior to operation
DETECTION
CONDITION•CPU detects malfunction in water heater unit
POSSIBLE
CAUSE•Water heater unit malfunction
—CPU malfunction
—Glow plug malfunction
—Flame detection sensor malfunction
STEP INSPECTION ACTION
1INSPECT WATER HEATER UNIT
•Replace the water heater unit. (See U–15
WATER HEATER UNIT REMOVAL/
INSTALLATION)
•Perform the Combustion Test. (See U–22 KOEO
Self Test/Combustion Test.)
•Are any DTCs present?Yes Go to the applicable DTC troubleshooting.
No Troubleshooting completed.

U–24
ON-BOARD DIAGNOSTIC
DTC B2449, B2450A6E857001038206
Diagnostic procedure
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DTC B2451, B2452A6E857001038207
Diagnostic procedure
DTCB2449 Glow plug circuit short to ground
B2450 Glow plug circuit open
DETECTION
CONDITION•CPU detects malfunction in glow plug circuit
POSSIBLE
CAUSE•Water heater unit malfunction
STEP INSPECTION ACTION
1INSPECT WATER HEATER UNIT
•Replace the water heater unit. (See U–15
WATER HEATER UNIT REMOVAL/
INSTALLATION)
•Perform the combustion Test. (See U–22 KOEO
Self Test/Combustion Test.)
•Are any DTCs present?Yes Go to the applicable DTC troubleshooting.
No Troubleshooting completed.
DTCB2451 Fuel pump (water heater system) circuit short to ground
B2452 Fuel pump (water heater system) circuit open
DETECTION
CONDITION•CPU detects malfunction in fuel pump (water heater system) circuit
POSSIBLE
CAUSE•Fuel pump (water heater system) malfunction
•Water heater unit malfunction
•Short to ground between water heater unit terminal B and fuel pump (water heater system) terminal A
•Open circuit between water heater unit terminal B and fuel pump (water heater system) terminal A
•Open circuit between fuel pump (water heater system) terminal B and GND
A C E
B D F WATER HEATER UNIT CONNECTORFUEL PUMP
(WATER HEATER SYSTEM)
CONNECTOR
A
B
STEP INSPECTION ACTION
1INSPECT WIRING HARNESS BETWEEN
WATER HEATER UNIT AND FUEL PUMP
(WATER HEATER SYSTEM) FOR
CONTINUITY
•Start the engine.
•Is the voltage at fuel pump (water heater
system) connector terminal A approximately
12 V?Yes Go to the next step
No Repair the wiring harness.
2INSPECT FUEL PUMP (WATER HEATER
SYSTEM)
•Inspect the fuel pump (water heater system).
(See U–16 FUEL PUMP (WATER HEATER
SYSTEM) INSPECTION)
•Is the fuel pump (water heater system) okay?Yes Go to the next step
No Replace the fuel pump (water heater system).
(See U–15 WATER HEATER UNIT REMOVAL/
INSTALLATION)
3INSPECT WIRING HARNESS BETWEEN
FUEL PUMP (WATER HEATER SYSTEM) AND
GROUND FOR CONTINUITY
•Is there continuity between the fuel pump
(water heater system) connector terminal B
and ground?Yes Go to the next step
No Repair the wiring harness.