AIR CONDITIONING SYSTEM, Diagnostic DTC:B1380

DTC Code DTC Name
B1380 External Condenser Refrigerant Temperature Sensor Circuit

DESCRIPTION

The heat exchanger temperature sensor is installed to the outlet pipe of the cooler condenser assembly and detects the refrigerant temperature for heat pump air-conditioning control. The resistance of the heat exchanger temperature sensor changes depending on the refrigerant temperature of the cooler condenser assembly outlet. When the temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance decreases.

The heat pump ECU assembly applies a voltage (5 V) to the heat exchanger temperature sensor and reads voltage changes due to changes in the resistance of the heat exchanger temperature sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1380 External Condenser Refrigerant Temperature Sensor Circuit Open or short in heat exchanger temperature sensor circuit

  • Heat exchanger temperature sensor

  • Harness or connector

  • Heat pump ECU assembly

Memorized

(4 sec. or more)*

WIRING DIAGRAM

A003OHXE06
*a DHMV
*b TCLT
*c Heat Exchanger Temperature Sensor
*d Heat Pump ECU Assembly

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1380 is output A
      DTC B1380, B1382 are output B

    B

    CHECK HARNESS AND CONNECTOR (HEAT EXCHANGER TEMPERATURE SENSOR - HEAT PUMP ECU ASSEMBLY) Click here

    A

  2. INSPECT HEAT EXCHANGER TEMPERATURE SENSOR

    A003KD7C02
    *a

    Component without harness connected

    (Heat Exchanger Temperature Sensor)
    *b Sensing Portion
    *c Resistance (kΩ)
    *d Temperature (°C (°F))
    *e Allowable Range

    1. Remove the heat exchanger temperature sensor.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (TCLT) - 2 (SEG2) 10°C (50°F) 3.87 to 3.96 kΩ
      15°C (59°F) 3.15 to 3.23 kΩ
      20°C (68°F) 2.57 to 2.66 kΩ
      25°C (77°F) 2.12 to 2.20 kΩ
      30°C (86°F) 1.75 to 1.83 kΩ
      35°C (95°F) 1.46 to 1.53 kΩ
      40°C (104°F) 1.22 to 1.29 kΩ
      45°C (113°F) 1.03 to 1.09 kΩ
      50°C (122°F) 0.87 to 0.92 kΩ
      55°C (131°F) 0.74 to 0.78 kΩ
      60°C (140°F) 0.63 to 0.67 kΩ

      Note


      • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.

      • When measuring, the sensor temperature must be the same as the ambient temperature.

      Tech Tips

      As the temperature increases, the resistance decreases (see the graph).

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEAT EXCHANGER TEMPERATURE SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (HEAT EXCHANGER TEMPERATURE SENSOR - HEAT PUMP ECU ASSEMBLY)


    1. Disconnect the A42 heat pump ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-2 (SEG2) - A42-8 (DHMV) Always Below 1 Ω
      A49-2 (SEG2) or A42-8 (DHMV) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEAT PUMP ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (HEAT EXCHANGER TEMPERATURE SENSOR - HEAT PUMP ECU ASSEMBLY)


    1. Disconnect the A49 heat exchanger temperature sensor connector.

    2. Disconnect the A42 heat pump ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-1 (TCLT) - A42-30 (SG-5) Always Below 1 Ω
      A49-1 (TCLT) or A42-30 (SG-5) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEAT PUMP ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR