AIR CONDITIONING SYSTEM, Diagnostic DTC:B1417/17

DTC Code DTC Name
B1417/17 Rear Evaporator Temperature Sensor Circuit

DESCRIPTION

The No. 2 air conditioning harness assembly (rear evaporator temperature sensor) is installed on the evaporator in the rear cooling unit to detect the temperature of the air that has passed through the evaporator and is used to control the air conditioning. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) changes in accordance with the cooled air temperature that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) and reads voltage changes as the resistance of the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
B1417/17 Rear Evaporator Temperature Sensor Circuit Open or short in No. 2 air conditioning harness assembly (rear evaporator temperature sensor) circuit

  • No. 2 air conditioning harness assembly (rear evaporator temperature sensor)

  • Air conditioning harness assembly

  • 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 parentheses.

WIRING DIAGRAM

B006MEGE16
*a No. 2 Air Conditioning Harness Assembly (Rear Evaporator Temperature Sensor)
*b Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note

When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

Click here

PROCEDURE


  1. READ VALUE USING GTS (EVAPORATOR FIN THERMISTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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
      Evap Temp Sensor (Rear) No. 2 air conditioning harness assembly (rear evaporator temperature sensor)

      Min.: -29.70°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      		 Actual evaporator temperature displayed

      No. 2 air conditioning harness assembly (rear evaporator temperature sensor) system malfunction:


      • When open circuit: -29.70°C (-21.46°F)

      • When short circuit: 59.55°C (139.19°F)

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

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY for LHD: Click here for RHD: Click here

    B

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

    C

  2. INSPECT NO. 2 AIR CONDITIONING HARNESS ASSEMBLY (REAR EVAPORATOR TEMPERATURE SENSOR)


    1. Remove the No. 2 air conditioning harness assembly (rear evaporator temperature sensor).

      Click here

    2. Inspect the No. 2 air conditioning harness assembly (rear evaporator temperature sensor).

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY (REAR EVAPORATOR TEMPERATURE SENSOR) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS ASSEMBLY [REAR EVAPORATOR TEMPERATURE SENSOR] - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the L18 No. 2 air conditioning harness assembly (rear evaporator temperature sensor) connector.

    2. Disconnect the G38 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
      L18-8 (+) - G38-5 (TEC) Always Below 1 Ω
      L18-7 (-) - G38-23 (SGND) Always Below 1 Ω
      L18-8 (+) - L18-7 (-) Always 10 kΩ or higher
      L18-8 (+) or G38-5 (TEC) - Body ground Always 10 kΩ or higher
      L18-7 (-) or G38-23 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY for LHD: Click here for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR