СИСТЕМА ECD, Diagnostic DTC:23

DTC Code DTC Name
23 Air Temperature Circuit Malfunction

DESCRIPTION

The intake air temperature sensor senses the intake air temperature. A thermistor built in this sensor changes the resistance value according to the intake air temperature as shown in the illustration. This resistance value of intake air temperature sensor is one of the factors to decide the fuel injection volume.

A01BC4QE01
DTC No. DTC Detection Condition Trouble Area
23 Open or short in intake air temperature sensor circuit for 0.5 sec. or more

  • Open or short in intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM

WIRING DIAGRAM

A01BDCNE01

INSPECTION PROCEDURE

Tech Tips


  • If different DTCs that are related to different systems are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may be open.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

When using intelligent tester:

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON.

    3. Select the item "Powertrain/Engine and ECT/Data List/Intake Air" and read its value displayed on the intelligent tester.

      Result
      Display Proceed
      - 40°C (- 40°F) A
      140°C (284°F) or more B
      The same as actual engine coolant temperature C

      Tech Tips

      When DTC 23 is present, check the intake air temperature by selecting "Powertrain/Engine and ECT/Data List/Intake Air" on the intelligent tester.

      Temperature displayed Malfunction
      - 40°C (- 40°F) Open circuit
      140°C (284°F) or more Short circuit

    B :

    CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Click here

    C :ПРОВЕРЬТЕ, НЕТ ЛИ ЭПИЗОДИЧЕСКИХ НЕИСПРАВНОСТЕЙ

    ПРОВЕРЬТЕ, НЕТ ЛИ ЭПИЗОДИЧЕСКИХ НЕИСПРАВНОСТЕЙ

    A :

  2. CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN)


    1. A01BHGXE01

      Disconnect the intake air temperature sensor connector.

    2. Connect the terminals 1 and 2 of the intake air temperature sensor harness side connector.

    3. Turn the ignition switch ON.

    4. Read the temperature value on the intelligent tester.

      Temperature
      140°C (284°F) or more

    NG :

    INSPECT ECM (CHECK FOR OPEN) Click here

    OK :REPLACE INTAKE AIR TEMPERATURE SENSOR

    REPLACE INTAKE AIR TEMPERATURE SENSOR

  3. INSPECT ECM (CHECK FOR OPEN)


    1. A01BEQRE01

      Connect between terminals THA and E2 of the ECM connector.

    2. Turn the ignition switch ON.

    3. Read the temperature value on the intelligent tester.

      Temperature
      140°C (284°F) or more

    NG :REPLACE ECM

    REPLACE ECM

    OK :REPAIR OR REPLACE HARNESS OR CONNECTOR

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)


    1. A01BD3GE02

      Disconnect the intake air temperature sensor connector.

    2. Turn the ignition switch ON.

    3. Read the temperature value on the intelligent tester.

      Temperature
      -40°C (-40°F) or more

    NG :

    INSPECT ECM (CHECK FOR SHORT) Click here

    OK :REPLACE INTAKE AIR TEMPERATURE SENSOR

    REPLACE INTAKE AIR TEMPERATURE SENSOR

  5. INSPECT ECM (CHECK FOR SHORT)


    1. A01BD8EE01

      Disconnect the ECM D4 connector.

    2. Turn the ignition switch ON.

    3. Read the temperature value on the intelligent tester.

      Temperature
      -40°C (-40°F) or more

    NG :REPLACE ECM

    REPLACE ECM

    OK :REPAIR OR REPLACE HARNESS OR CONNECTOR

    REPAIR OR REPLACE HARNESS OR CONNECTOR

When not using intelligent tester:

PROCEDURE


  1. INSPECT ECM


    1. A01BCNHE07

      Turn the ignition switch ON.

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

      Standard voltage
      Tester Connection Specified Condition
      THA (D4-3) - E2 (D4-9) 0.2 to 3.8 V (20°C (68°F))
      THA (D4-3) - E2 (D4-9) 0.1 to 1.5 V (80°C (176°F))

    NG :

    INSPECT INTAKE AIR TEMPERATURE SENSOR Click here

    OK :ПРОВЕРЬТЕ, НЕТ ЛИ ЭПИЗОДИЧЕСКИХ НЕИСПРАВНОСТЕЙ

    ПРОВЕРЬТЕ, НЕТ ЛИ ЭПИЗОДИЧЕСКИХ НЕИСПРАВНОСТЕЙ

  2. INSPECT INTAKE AIR TEMPERATURE SENSOR


    1. A01BAHOE01

      Measure the resistance according to the illustration.

      OK
      The resistance value is within the acceptable range shown in the illustration.

    NG :REPLACE INTAKE AIR TEMPERATURE SENSOR

    REPLACE INTAKE AIR TEMPERATURE SENSOR

    OK :

  3. CHECK HARNESS AND CONNECTOR (ECM - INTAKE AIR TEMPERATURE SENSOR)


    1. A01BFQJE01

      Disconnect the intake air temperature sensor connector.

    2. Disconnect the ECM D4 connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      THA (A2-2) - THA (D4-3) Below 1 Ω
      E2 (A2-1) - E2 (D4-9) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      THA (D4-3) - E2 (D4-9) 10 kΩ or higher

    NG :REPAIR OR REPLACE HARNESS OR CONNECTOR

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK :REPLACE ECM

    REPLACE ECM