DTC 012 Overheating

DTC 014 Difference Evaluation Overheating

DTC No.	DTC Detection Condition	Trouble Area
012	The surface sensor or control overheating sensor detects a temperature of 125°C (257°F) or more.	Surface sensor (combustion heater assembly) Control overheating sensor (combustion heater assembly) Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly)
014	When the engine coolant temperature is 80°C (176°F) and the combustion heater assembly is operating, the difference in temperatures detected by the surface sensor and control overheating sensor is 25°C (77°F) or more.	Surface sensor (combustion heater assembly) Control overheating sensor (combustion heater assembly) Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly)
017	When neither DTC 012 nor 014 is detected, the control overheating sensor or surface sensor detects a temperature of 130°C (266°F).	Control overheating sensor (combustion heater assembly) Surface sensor (combustion heater assembly) Engine coolant circuit (for leaks, engine coolant quality, thermostat, water pump assembly)

1.CHECK FOR ENGINE COOLANT LEAKS

Check for engine coolant leaks .

REPAIR ENGINE COOLANT LEAKS

OK

2.CHECK ENGINE COOLANT QUALITY

Check the engine coolant quality .

REPLACE ENGINE COOLANT

OK

3.INSPECT THERMOSTAT

Inspect the thermostat .

REPLACE THERMOSTAT

OK

4.INSPECT WATER PUMP ASSEMBLY

Inspect the water pump assembly .

REPLACE WATER PUMP ASSEMBLY

REPLACE COMBUSTION HEATER ASSEMBLY