ON-BOARD DIAGNOSTIC
U–23
U
U
HEATER AND AIR CONDITIONER SYSTEMS
DTC B1318
A6E857001038204
Diagnostic procedure
End Of Sie
DTC B1342, B2463, B2537, B2538, B2547
A6E857001038205
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
1 INSPECT 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.
2 INSPECT 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.
3 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.
4 VERIFY 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.
AC
E
B
D
F
WATER HEATER UNIT CONNECTOR
DTC
B1342 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
1 INSPECT 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.
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