2002 MAZDA 6 wiring

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
End Of Sie
DTC B1342, B2463, B2537, B2538, B2547A6E857001038205
Diagnostic procedure
End Of Sie
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
End Of Sie
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.