AIR CONDITIONING SYSTEM, Diagnostic DTC:B1414/14

DTC Code DTC Name
B1414/14 Water Temperature Circuit

DESCRIPTION

The No. 2 Cooler Thermistor is installed in the heater radiator unit sub-assembly to detect the water temperature which is used to control the heater and air conditioning system heater mode. The resistance of the No. 2 cooler thermistor changes in accordance with the water temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies a voltage (5 V) to the No. 2 cooler thermistor and reads voltage changes due to changes in the resistance of the No. 2 Cooler Thermistor.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1414/14 Water Temperature Circuit

Any of the following conditions is met:


  • Open in No. 2 cooler thermistor circuit

  • Short in No. 2 cooler thermistor circuit

  • No. 2 cooler thermistor

  • No. 2 cooler thermistor harness

  • Harness or connector

  • Air conditioning amplifier assembly

 Memorized (4 seconds or more)

Tech Tips

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Power switch on (IG) ○ ○
Malfunction Status Open in No. 2 cooler thermistor circuit ○ -
Short in No. 2 cooler thermistor circuit - ○
Detection Time 4 seconds or more 4 seconds or more
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A01MIYDE01

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. Check the value(s) by referring to the table below.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine Coolant Temp Heater core inlet water temperature

      Min.: 1.30°C (34.34°F)

      Max.: 90.55°C (194.99°F)

      		 Heater pipe (electric heater sub-assembly to heater radiator unit sub-assembly) temperature displayed -

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Engine Coolant Temp
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to Problem Symptoms Table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

  2. INSPECT NO. 2 COOLER THERMISTOR


    1. Remove the No. 2 cooler thermistor.

      Click here

    2. Inspect the No. 2 cooler thermistor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 COOLER THERMISTOR Click here

    OK

  3. CHECK NO. 2 COOLER THERMISTOR HARNESS


    1. A01MJUIC02
      *1 No. 2 Cooler Thermistor Harness
      *a

      Front view of air conditioning harness assembly

      (to No. 2 Cooler Thermistor)
      *b

      Front view of air conditioning harness assembly

      (to Wire Harness)

      Disconnect the No. 2 cooler thermistor harness.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E-2 - G53-3 (E2) Always Below 1 Ω
      E-1 - G53-4 (THW) Always Below 1 Ω
      E-2 or G53-3 (E2) - Body ground Always 10 kΩ or higher
      E-1 or G53-4 (THW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 COOLER THERMISTOR HARNESS Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 2 COOLER THERMISTOR HARNESS - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the G53 No. 2 cooler thermistor harness connector.

    2. Disconnect the G42 air conditioning amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G53-4 (THW) - G42-6 (SG-5) Always Below 1 Ω
      G53-3 (E2) - G42-3 (TW) Always Below 1 Ω
      G53-4 (THW) or G42-6 (SG-5) - Body ground Always 10 kΩ or higher
      G53-3 (E2) or G42-3 (TW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR