Mazda Mazda6 - Page 891

ON-BOARD DIAGNOSTIC
U–25
U
End Of Sie
DTC B2453, B2454
A6E857001038208
Diagnostic procedure
End Of Sie
DTC B2548
A6E857001038210
Diagnostic procedure
End Of Sie
4 INSPECT 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.
5 VERIFY AFTER REPAIR PROCEDURE
• Perform after repair procedure. (See U–22–1
After Repair Procedure.)
• Are any DTCs present?
Yes Go to the applicable DTC troubleshooting.
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC
B2453 Blower fan circuit short to ground
B2454 Blower fan circuit open
DETECTION
CONDITION
• CPU detects Malfunction in blower fan circuit
POSSIBLE
CAUSE
• Water heater unit malfunction
ACTION
• Replace the water heater unit.
(See U–15 WATER HEATER UNIT REMOVAL/INSTALLATION)
DTC B2548 Water heater lockout mode
DETECTION
CONDITION
• This DTC is stored if the water heater unit detects the same DTC three times and the water heater unit
then suspends system operation for safety reasons.
POSSIBLE
CAUSE
• Water heater unit malfunction
• Fuel pump (water heater system) malfunction
• Generator malfunction
• Battery malfunction
• Open or short circuit in related harness
STEP INSPECTION ACTION
1 INSPECT WATER HEATER UNIT
• Perform the lockout reset. (See U–22–1 Lockout
Reset.)
• Read DTCs using the SST (WDS or equivalent)
• Are any DTCs present?
Yes Go to applicable DTC troubleshooting.
No Troubleshooting completed.