Dtc 012 Overheating


DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR ENGINE COOLANT LEAK

CHECK ENGINE COOLANT QUALITY

INSPECT THERMOSTAT

INSPECT WATER PUMP ASSEMBLY

DTC 012 Overheating

DTC 014 Difference Evaluation Overheating

DTC 017 Hardware Overheating


DESCRIPTION


DTC Code
DTC Detection Condition
Trouble Area
012
The surface sensor or control overheating sensor detects a temperature of 125°C (257°F) or higher.
  1. Heater assembly (surface sensor)
  2. Heater assembly (control overheating sensor)
  3. Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)
014
When the engine coolant temperature is 80°C (176°F) and the heater assembly is operating, the difference in temperatures detected by the surface sensor and control overheating sensor is 25°C (77°F) or higher.
  1. Heater assembly (surface sensor)
  2. Heater assembly (control overheating sensor)
  3. Engine coolant circuit (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).
  1. Heater assembly (surface sensor)
  2. Heater assembly (control overheating sensor)
  3. Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

INSPECTION PROCEDURE

1.CHECK FOR ENGINE COOLANT LEAK

  1. Check for engine coolant leaks (LandCruiser RM00000419K013X_01_0016.html).



NG
REPAIR ENGINE COOLANT LEAK (LandCruiser RM00000419K013X_01_0016.html)
OK


2.CHECK ENGINE COOLANT QUALITY

  1. Check the engine coolant quality (LandCruiser RM00000419K013X.html).



NG
REPLACE ENGINE COOLANT (LandCruiser RM00000419K013X.html)
OK


3.INSPECT THERMOSTAT

  1. Remove the thermostat (LandCruiser RM000000MWE02ZX.html).

  1. Inspect the thermostat (LandCruiser RM000000V1K072X.html).



NG
REPLACE THERMOSTAT (LandCruiser RM000000MWE02ZX.html)
OK


4.INSPECT WATER PUMP ASSEMBLY

  1. Remove the water pump assembly (LandCruiser RM000000MWA035X.html).

  1. Inspect the water pump assembly (LandCruiser RM0000041DB011X.html).



NG
REPLACE WATER PUMP ASSEMBLY (LandCruiser RM000000MWA035X.html)
OK

REPLACE HEATER ASSEMBLY (LandCruiser RM000005TN8000X.html)