AIR CONDITIONING SYSTEM, Diagnostic DTC:B1382

DTC Code DTC Name
B1382 Evaporator Refrigerant Temperature Sensor Circuit

DESCRIPTION

The evaporator pipe temperature sensor is installed to the outlet pipe of the No. 1 cooler evaporator sub-assembly and detects the refrigerant temperature for heat pump air-conditioning control. The resistance of the evaporator pipe temperature sensor changes depending on the refrigerant temperature of the No. 1 cooler evaporator sub-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 evaporator pipe temperature sensor and reads voltage changes due to changes in the resistance of the evaporator pipe temperature sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1382 Evaporator Refrigerant Temperature Sensor Circuit Open or short in evaporator pipe temperature sensor circuit

  • Evaporator pipe temperature sensor

  • Harness or connector

  • Heat pump ECU assembly

Memorized

(4 sec. or more)*

WIRING DIAGRAM

A003OHXE08
*a TPOR
*b Evaporator Pipe Temperature Sensor
*c 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 (EVAPORATOR PIPE TEMPERATURE SENSOR - HEAT PUMP ECU ASSEMBLY) Click here

    A

  2. INSPECT EVAPORATOR PIPE TEMPERATURE SENSOR

    A003KD7C02
    *a

    Component without harness connected

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

    1. Remove the evaporator pipe 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 (TMP2) - 2 (-) 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 EVAPORATOR PIPE TEMPERATURE SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (EVAPORATOR PIPE 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
      A48-2 (-) - A42-9 (TPOR) Always Below 1 Ω
      A48-2 (-) or A42-9 (TPOR) - 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 (EVAPORATOR PIPE TEMPERATURE SENSOR - HEAT PUMP ECU ASSEMBLY)


    1. Disconnect the A48 evaporator pipe 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
      A48-1 (TMP2) - A42-30 (SG-5) Always Below 1 Ω
      A48-1 (TMP2) 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