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ECD SYSTEM (for CCo), Diagnostic DTC:P1496, P1497

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DTC Code DTC Name
P1496 Intake Air Temperature Sensor 1 Circuit Low
P1497 Intake Air Temperature Sensor 1 Circuit High
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DESCRIPTION

The Intake Air Temperature (IAT) sensor senses the IAT after the intake air passes through the intercooler. A built-in thermistor in the sensor changes its resistance value according to the intake air temperature. The lower the intake air temperature, the higher 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.

Table 1. P1496
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 1 second

Short in the intake air temperature sensor (turbo) circuit for 0.5 seconds.

(1 trip detection logic)

  • Short in intake air temperature sensor (turbo) circuit

  • intake air temperature sensor (turbo)

  • ECM
Table 2. P1497
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 1 second

Open in the intake air temperature sensor (turbo) circuit for 0.5 seconds.

(1 trip detection logic)

  • Open in intake air temperature sensor (turbo) circuit

  • intake air temperature sensor (turbo)

  • ECM
Table 3. Related Data List
DTC No. Data List
P1496 Intake Air Temp (Turbo)
P1497
Tip:

  • If DTC P1496 or P1497 is stored, the following symptoms may appear:


    • Misfire

    • Combustion noise

    • Black smoke

    • White smoke

    • Lack of power

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

  • If DTCs relating to different systems are stored and they share terminal E2 as their ground, check this ground circuit first.

  • 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.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE [TURBO])


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

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

    4. Read the value.

      OK
      Same as air temperature near intake manifold.
      Table 4. Result
      Result Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      OK (same as air temperature near intake manifold) C
      Tip:

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

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


  2. Click here

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


    1. A01IPGIE04

      Disconnect the intake air temperature sensor (turbo) connector.

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

    3. Connect the intelligent tester to the DLC3.

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

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

    6. Read the value.

      OK
      140°C (284°F) or higher
      Table 5. Text in Illustration
      *1 Intake Air Temperature Sensor (Turbo)
      *2 ECM
      *3

      Front view of wire harness connector

      (to Intake Air Temperature Sensor (Turbo))

    7. Reconnect the intake air temperature sensor (turbo) connector.


  3. Click here

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


    1. A01IUD4E08

      Disconnect the intake air temperature sensor (turbo) connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B1-2 - C69-113 (THIA) Always Below 1 Ω
      B1-1 - C69-90 (ETHI) Always Below 1 Ω
      Table 6. Text in Illustration
      *1

      Front view of wire harness connector

      (to Intake Air Temperature Sensor (Turbo))
      *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the intake air temperature sensor (turbo) connector.

    5. Reconnect the ECM connector.


  4. Click here

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


    1. A01IPJ0E07

      Disconnect the intake air temperature sensor (turbo) connector.

    2. Connect the intelligent tester to the DLC3.

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

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

    5. Read the value.

      OK
      -40°C (-40°F)
      Table 7. Text in Illustration
      *1 Intake Air Temperature Sensor (Turbo)
      *2 ECM

    6. Reconnect the intake air temperature sensor (turbo) connector.


  5. Click here

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


    1. A01IUD4E09

      Disconnect the intake air temperature sensor (turbo) connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B1-2 or C69-113 (THIA) - Body ground Always 10 kΩ or higher
      Table 8. Text in Illustration
      *1

      Front view of wire harness connector

      (to Intake Air Temperature Sensor (Turbo))
      *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the intake air temperature sensor (turbo) connector.

    5. Reconnect the ECM connector.


  6. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  7. Click here

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO).


    1. Replace the intake air temperature sensor (turbo) (Click here).


  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


  9. Click here

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM.


    1. Replace the ECM (Click here).


  10. Click here

    REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO)


    1. Replace the intake air temperature sensor (turbo) (Click here).


  11. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off for 30 seconds or more.

    4. Turn the ignition switch to ON for 1 second.

    5. Enter the following menus: Powertrain / Engine and ECT / DTC.

    6. Confirm that the DTC is not output again.


  12. Click here

    END