СИСТЕМА ECD, Diagnostic DTC:P0095/23, P0097/23, P0098/23

DTC Code DTC Name
P0095/23 Intake Air Temperature Sensor 2 Circuit
P0097/23 Intake Air Temperature Sensor 2 Circuit Low
P0098/23 Intake Air Temperature Sensor 2 Circuit High

DESCRIPTION

The diesel turbo Intake Air Temperature (IAT) sensor is built into the intake air connector (located between diesel throttle body and intake manifold) and senses the IAT. A built-in thermistor of the sensor changes the resistance value according to the intake air temperature. The lower the IAT is the greater the thermistor resistance value becomes, and the higher the temperature is the lower the resistance value becomes (see Fig. 1).

The sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the sensor from terminal THIA via resistor R. Resistor R and the sensor are connected in series. When the resistance value of the sensor changes in accordance with changes in the IAT, the potential at terminal THIA also changes. Based on this signal, the ECM corrects the fuel injection volume to improve the driveability with a cold engine.

A01BBBAE03
DTC No. DTC Detection Condition Trouble Area
P0095/23

Open or short in diesel turbo IAT sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in diesel turbo IAT sensor circuit

  • Diesel turbo IAT sensor

  • ECM
P0097/23

Short in diesel turbo IAT sensor circuit for 0.5 seconds

(sensor resistance value less than 25 Ω [sensor output voltage less than 0.05 V])

(1 trip detection logic)

  • Open or short in IAT sensor circuit

  • Diesel turbo IAT sensor

  • ECM
P0098/23

Open in diesel turbo IAT sensor circuit for 0.5 seconds

(sensor resistance value more than 156 kΩ [sensor output voltage more than 4.9 V])

(1 trip detection logic)

  • Open or short in IAT sensor circuit

  • Diesel turbo IAT sensor

  • ECM

WIRING DIAGRAM

A01BB6IE48

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips


  • If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

Note

Before starting the diagnostic procedures, check if the intelligent tester Data List's "Intake Air Temp (Turbo)" is displayed. Enter the following the menus: Powertrain / Engine / Data List.

Result
Tester Displayed Proceed to
"Intake Air Temp (Turbo)" is displayed "When using intelligent tester" diagnostic procedures
"Intake Air Temp (Turbo)" is not displayed "When not using intelligent tester" diagnostic procedures

When using intelligent tester:

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).

    4. Read the value.

      OK
      Same value as the actual intake air temperature.
      Result
      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      OK (same as air temperature near to intake manifold) C

      Tech Tips


      • If there is an open circuit, the intelligent tester indicates -40°C (-40°F).

      • If there is a short circuit, the intelligent tester indicates 140°C (284°F) or more.


    B

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS

    A

  2. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    1. A01BFH0E01

      Disconnect the D49 diesel turbo IAT sensor connector.

    2. Connect terminals 1 and 2 of the diesel turbo IAT sensor wire harness side connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the intelligent tester ON.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).

    6. Read the values.

      Standard
      140°C (284°F) or more.

    OK

    CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR

    NG

  3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)


    1. A01BD7WE01

      Disconnect the D49 diesel turbo IAT sensor connector.

    2. Connect terminals THIA and E2 of the D1 ECM connector.

      Tech Tips

      Before checking, perform a visual and contact pressure check on the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the intelligent tester ON.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).

    6. Read the values.

      Standard
      140°C (284°F) or more.

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    NG

    CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM

  4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    1. A01BCZFE05

      Disconnect the D49 diesel turbo IAT sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch ON and turn the intelligent tester ON.

    4. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).

    5. Read the values.

      Standard
      -40°C (-40°F) or more.

    OK

    REPLACE DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR

    NG

  5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)


    1. A01BHIKE01

      Disconnect the D49 diesel turbo IAT sensor connector.

    2. Disconnect the D1 ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the intelligent tester ON.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).

    6. Read the values.

      Standard
      -40°C (-40°F) or more.

    OK

    CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR

    NG

    REPLACE ECM

When not using intelligent tester:

PROCEDURE


  1. CHECK ECM TERMINAL VOLTAGE (THIA - E2 TERMINALS)


    1. A01BDTYE38

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      D1-20 (THIA) - D1-28 (E2) 20°C (68°F) 0.5 to 3.4 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR


    1. A01BDFIE02

      Remove the diesel turbo IAT sensor.

    2. Measure the resistance of the sensor.

      Standard resistance
      Connection Specified Condition
      20°C (68°F) 2.16 to 2.17 kΩ

      Note

      If checking the IAT sensor in the water, keep the terminals dry. After the checking, wipe the sensor dry.


    NG

    REPLACE DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR

    OK

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


    1. A01BAJTE03

      Disconnect the D49 diesel turbo IAT sensor connector.

    2. Disconnect the D1 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      D1-20 (THIA) - D49-2 Below 1 Ω
      D1-28 (E2) - D49-1 Below 1 Ω
      D1-20 (THIA) or D49-2 - Body ground 10 kΩ or higher
      D1-28 (E2) or D49-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM