DTC    012    Overheating

DTC    014    Difference Evaluation Overheating

DTC    017    Hardware Overheating

for Preparation Click here


DESCRIPTION


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.
  1. Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)
  2. Surface sensor (combustion heater assembly)
  3. Control overheating sensor (combustion heater assembly)
014
When the engine coolant temperature is 80°C (176°F) and the combustion heater is operating, the difference in temperatures detected by the surface sensor and control overheating sensor is 25°C (77°F) or more.
  1. Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)
  2. Surface sensor (combustion heater assembly)
  3. Control overheating sensor (combustion heater 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).
  1. Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)
  2. Surface sensor (combustion heater assembly)
  3. Control overheating sensor (combustion heater assembly)

INSPECTION PROCEDURE

1.CHECK FOR ENGINE COOLANT LEAKS

  1. Check for engine coolant leaks (Click here).



NG
REPAIR ENGINE COOLANT LEAKS
OK


2.CHECK ENGINE COOLANT QUALITY

  1. Check the engine coolant quality (Click here).



NG
REPLACE ENGINE COOLANT (Click here)
OK


3.INSPECT THERMOSTAT

  1. Inspect the thermostat (Click here).



NG
REPLACE THERMOSTAT (Click here)
OK


4.INSPECT WATER PUMP ASSEMBLY

  1. Inspect the water pump assembly (Click here).



NG
REPLACE WATER PUMP ASSEMBLY (Click here)
OK

REPLACE COMBUSTION HEATER ASSEMBLY (Click here)