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 air conditioning unit to detect the cooled air temperature that has passed through the evaporator and to control the rear air conditioning. It sends signals to the air conditioning amplifier assembly. The signals change in accordance with the resistance of the No. 2 air conditioning harness assembly (rear evaporator temperature sensor). 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 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 the No. 2 air conditioning harness assembly (rear evaporator temperature sensor) circuit.

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

  • Harness or connector

  • Air conditioning amplifier assembly

Stored

(4 seconds or more)

-

WIRING DIAGRAM

E196917E07

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (REAR EVAPORATOR TEMPERATURE SENSOR)

    1. Use the Data List to check if the rear evaporator temperature sensor is functioning properly

      Click here

      Table 1. Air Conditioner

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      Ambient Temp Sens (Rear)

      Rear evaporator temperature sensor /

      Min.: -29.7°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      Actual rear evaporator temperature displayed

      Open in the circuit: -29.7°C (- 21.46°F).

      Short in the circuit: 59.55°C (139.19°F).

      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 AIR CONDITIONING HARNESS ASSEMBLY (REAR EVAPORATOR TEMPERATURE SENSOR)

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

      Click here

      E252327C01

      *a

      Sensing Portion

      *b

      Resistance

      *c

      Allowable Range

      *d

      Temperature

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      7 (-) - 8 (+)

      -10°C (14°F)

      7.30 to 9.10 kΩ

      -5°C (23°F)

      5.65 to 6.95 kΩ

      0°C (32°F)

      4.40 to 5.35 kΩ

      5°C (41°F)

      3.40 to 4.15 kΩ

      10°C (50°F)

      2.70 to 3.25 kΩ

      15°C (59°F)

      2.14 to 2.58 kΩ

      20°C (68°F)

      1.71 to 2.05 kΩ

      25°C (77°F)

      1.38 to 1.64 kΩ

      30°C (86°F)

      1.11 to 1.32 kΩ
      Note:

      • Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.

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

      Tip:

      As the temperature increases, the resistance decreases (refer to the graph).

    Result

    Result

    OK

    NG
    NG

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

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

    1. Disconnect the Q13 harness connector.

    2. Disconnect the G12 amplifier connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Q13-8 (+) - G12-4 (TEC)

      Always

      Below 1 Ω

      Q13-7 (-) - G12-19 (SGND)

      Always

      Below 1 Ω

      Q13-8 (+) - Body ground

      Always

      10 kΩ or higher

      Q13-7 (-) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR