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. Detection Item DTC Detection Condition Trouble Area
012 Overheating The surface sensor or control overheating sensor detects a temperature of 125°C (257°F) or higher.

  • Heater assembly (surface sensor)

  • Heater assembly (control overheating sensor)

  • Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)
014 Difference Evaluation Overheating 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.

  • Heater assembly (surface sensor)

  • Heater assembly (control overheating sensor)

  • Engine coolant circuit (leaks, engine coolant quality, thermostat, water pump assembly)
017 Hardware Overheating When neither DTC 012 nor 014 is detected, the control overheating sensor or surface sensor detects a temperature of 130°C (266°F).

  • Heater assembly (surface sensor)

  • Heater assembly (control overheating sensor)

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

PROCEDURE


  1. CHECK FOR ENGINE COOLANT LEAKS


    1. Check for engine coolant leaks.


      Result
      Proceed to
      OK
      NG

    NG

    REPAIR ENGINE COOLANT LEAKS for 2AD-FHV: Click here for 2AD-FTV: Click here for 2WW: Click here

    OK

  2. CHECK ENGINE COOLANT QUALITY


    1. Check the engine coolant quality.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ENGINE COOLANT for 2AD-FHV: Click here for 2AD-FTV: Click here for 2WW: Click here

    OK

  3. INSPECT THERMOSTAT


    1. Remove the thermostat.


    2. Inspect the thermostat.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE THERMOSTAT for 2AD-FHV: Click here for 2AD-FTV: Click here for 2WW: Click here

    OK

  4. INSPECT WATER PUMP ASSEMBLY


    1. Remove the water pump assembly.


    2. Inspect the water pump assembly.


      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEATER ASSEMBLY Click here

    NG

    REPLACE WATER PUMP ASSEMBLY for 2AD-FHV: Click here for 2AD-FTV: Click here for 2WW: Click here