COMBUSTION TYPE POWER HEATER SYSTEM, Diagnostic DTC:012, 014, 017

DTC Code DTC Name
012 Overheating
014 Difference Evaluation Overheating
017 Hardware Overheating

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
012 The surface sensor or temperature control sensor detects a temperature of 125°C (257°F) or more.

  • Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

  • Surface sensor (combustion heater assembly)

  • Temperature control 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 temperature control sensor is 25°C (77°F) or more.

  • Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

  • Surface sensor (combustion heater assembly)

  • Temperature control sensor (combustion heater assembly)
017 When neither DTC 012 nor 014 is detected, the temperature control sensor or surface sensor detects a temperature of 130°C (266°F).

  • Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)

  • Surface sensor (combustion heater assembly)

  • Temperature control sensor (combustion heater assembly)

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.


    OK

    REPLACE COMBUSTION HEATER ASSEMBLY Click here

    NG

    REPLACE WATER PUMP ASSEMBLY Click here