ECD SYSTEM (w/ EGR Cooler), Diagnostic DTC:P0095, P0097, P0098

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

DESCRIPTION

The Intake Air Temperature (IAT) sensor is built into the inter cooler and senses the IAT. A built-in thermistor in the sensor changes its resistance value according to the intake air temperature. The lower the intake air temperature, the greater the thermistor resistance value. The higher the intake air temperature, the lower the thermistor resistance value (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 driveability with a cold engine.

A01DZUUE03
DTC No. DTC Detection Condition Trouble Area
P0095

Open or short in intake air temperature sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM
P0097

Short in intake air temperature 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 intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM
P0098

Open in intake air temperature 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 intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM

Tech Tips

When DTC P0095, P0097 and/or P0098 is set, check the intake air temperature by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Intake Air Temp (Turbo).

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

WIRING DIAGRAM

A01E2Z1E24

INSPECTION PROCEDURE

Note

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

Tech Tips


  • If different 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 condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE OF INTELLIGENT TESTER (INTAKE AIR TEMP [TURBO])


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the 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 OF INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. A01DXSRE11

      Disconnect the I4 intake air temperature sensor connector.

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

    3. Connect the intelligent tester to the DLC3.

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

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

    6. Read the value.

      Standard
      140°C (284°F)

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    NG

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


    1. A01E1UIE10

      Disconnect the I4 intake air temperature sensor connector.

    2. Connect terminals THIA and E2 of the E8 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 tester ON.

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

    6. Read the value.

      Standard
      140°C (284°F)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM Click here

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


    1. A01E1WWE45

      Disconnect the I4 intake air temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

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

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

    5. Read the value.

      Standard
      -40°C (-40°F)

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    NG

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


    1. A01DV96E14

      Disconnect the I4 intake air temperature sensor connector.

    2. Disconnect the E8 ECM connector.

    3. Connect the intelligent tester to the DLC3.

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

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

    6. Read the value.

      Standard
      -40°C (-40°F)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE ECM Click here