ECD SYSTEM, 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 (after turbocharged), built into the intake pipe, senses the turbocharged air temperature. A thermistor built in the sensor changes the resistance value according to the IAT. The lower the IAT is the greater the thermistor resistance value becomes, and the higher the IAT is the lower the thermistor resistance value becomes (see Fig. 1).

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

A01CJAME06
DTC No. Proceed to DTC Detection Condition Trouble Area
P0095 Step 1 Open or short in IAT sensor (after turbocharged) circuit for 0.5 seconds (1 trip detection logic)

  • Open or short in IAT sensor (after turbocharged) circuit

  • IAT sensor (after turbocharged)

  • ECM
P0097 Step 4 Short in IAT sensor (after turbocharged) circuit for 0.5 seconds

  • Open or short in IAT sensor (after turbocharged) circuit

  • IAT sensor (after turbocharged)

  • ECM
P0098 Step2 Open in IAT sensor (after turbocharged) circuit for 0.5 seconds

  • Open or short in IAT sensor (after turbocharged) circuit

  • IAT sensor (after turbocharged)

  • ECM

Tech Tips

When any of DTCs are set, check the IAT by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

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

WIRING DIAGRAM

A01CGTHE07

INSPECTION PROCEDURE

Tech Tips


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

  • 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.

PROCEDURE


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


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to the ON position.

    4. Turn the tester on.

    5. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    6. Read the value.

      Standard
      Same value as the actual inlet air temperature.
      Result
      Temperature Display Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      OK (same as air temperature near 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. A01CGYOE01

      Disconnect the IAT sensor connector.

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

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Turn the tester on.

    7. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    8. Read the value.

      Standard
      140°C (284°F) or more

    9. Reconnect the IAT sensor connector.


    NG

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) Click here

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR

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


    1. A01CHT9E13

      Disconnect the IAT sensor connector.

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

      Tech Tips

      Before checking, do a visual and contact pressure check for the ECM connector.

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Turn the tester on.

    7. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    8. Read the value.

      Standard
      140°C (284°F) or more

    9. Reconnect the IAT sensor connector.


    NG

    REPLACE ECM

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - INTAKE AIR TEMPERATURE SENSOR)

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


    1. A01CGN4E07

      Disconnect the IAT sensor connector.

    2. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    7. Read the value.

      Standard
      -40°C (-40°F)

    8. Reconnect the IAT sensor connector.


    NG

    CHECK INTAKE AIR TEMPERATURE SENSOR (CHECK FOR SHORT IN ECM) Click here

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR

  5. CHECK INTAKE AIR TEMPERATURE SENSOR (CHECK FOR SHORT IN ECM)


    1. A01CH2EE12

      Disconnect the ECM connector.

    2. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

    7. Read the value.

      Standard
      -40°C (-40°F)

    8. Reconnect the ECM connector.


    NG

    REPLACE ECM

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - INTAKE AIR TEMPERATURE SENSOR)