ECD SYSTEM, Diagnostic DTC:P007C, P007D

DTC Code DTC Name
P007C Charge Air Cooler Temperature Sensor Circuit Low
P007D Charge Air Cooler Temperature Sensor Circuit High

DESCRIPTION

The Intake Air Temperature (IAT) sensor is mounted on the charge air cooler duct 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 drivability with a cold engine.

A005I49E01
P007C
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 2 seconds

Intake air temperature sensor output voltage is 0.05 V or less.

(1 trip detection logic)

  • Open in intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM
P007D
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 2 seconds

Intake air temperature sensor output voltage is 3.1 V or more.

(1 trip detection logic)

  • Short in intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM
Related Data List
DTC No. Data List
P007C Intake Air Temp (Turbo)
P007D

Tech Tips


  • If DTC P007C or P007D is stored, the following symptoms may appear:


    • Misfire

    • Combustion noise

    • Black smoke

    • White smoke

    • Lack of power

  • When DTC P007C or P007D is stored, check the intake air temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

Temperature Displayed Malfunction
-30°C (-22°F) or less Open circuit
149°C (300°F) or more Short circuit

WIRING DIAGRAM

A005KQ3E01
*a INTAKE AIR TEMPERATURE SENSOR

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • 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 USING INTELLIGENT TESTER (INTAKE AIR TEMP [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.

      Standard
      Same as actual intake air temperature.
      Result
      Result Proceed to
      -30°C (-22°F) or less A
      149°C (300°F) or more B
      Same as actual intake air temperature C

      Tech Tips


      • If there is an open circuit, the intelligent tester indicates -30°C (-22°F) or less.

      • If there is a short circuit, the intelligent tester indicates 149°C (300°F) or more.


    B

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

    C

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

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


    1. A005KIOE01
      Text in Illustration
      *1 Intake Air Temperature Sensor
      *a

      Front view of wire harness connector

      (to Intake Air Temperature Sensor)

      Disconnect the intake air temperature sensor connector.

    2. Connect terminals B42-1 and B42-2 of the intake air temperature sensor 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).

      Standard
      149°C (300°F) or more

    6. Reconnect the intake air temperature sensor connector.


    OK

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the intake air temperature sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B42-2 - B21-8 (THIA) Always Below 1 Ω
      B42-1 - B21-7 (ETHI) Always Below 1 Ω

    4. Reconnect the intake air temperature meter connector.

    5. Reconnect the ECM connector.


    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

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


    1. A005MCKE28
      Text in Illustration
      *1 Intake Air Temperature Sensor

      Disconnect the intake air temperature sensor 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).

      Standard
      -30°C (-22°F) or less

    5. Reconnect the intake air temperature sensor connector.


    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the intake air temperature sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B42-2 or B21-8 (THIA) - Body ground Always 10 kΩ or higher

    4. Reconnect the intake air temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE INTAKE AIR TEMPERATURE SENSOR


    1. Replace the intake air temperature sensor Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPLACE INTAKE AIR TEMPERATURE SENSOR


    1. Replace the intake air temperature sensor Click here.


    NEXT

  11. 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 and wait for 30 seconds or more.

    4. Turn the ignition switch to ON and wait for 10 seconds or more.

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

    6. Confirm that the DTC is not output again.


    NEXT

    END