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ECD SYSTEM(w/ DPF), Diagnostic DTC:P0112, P0113

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DTC Code DTC Name
P0112 Intake Air Temperature Circuit Low Input
P0113 Intake Air Temperature Circuit High Input
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DESCRIPTION

The intake air temperature sensor is built into the Mass Air Flow (MAF) meter and senses the intake air temperature.

A thermistor built into 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 intake air temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA via resistor R. Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the potential at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve drivability with a cold engine.

Tip:

When the intake air temperature sensor output is outside the normal range, the ECM determines that this is a malfunction.

Table 1. P0112
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for approximately 15 seconds

Intake air temperature sensor output is more than 140°C (284°F).

(2 trip detection logic)

  • Short in intake air temperature sensor (built into mass air flow meter) circuit

  • Intake air temperature sensor (built into mass air flow meter)

  • ECM
Table 2. P0113
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for approximately 15 seconds

Intake air temperature sensor output is less than -40°C (-40°F).

(2 trip detection logic)

  • Open in intake air temperature sensor (built into mass air flow meter) circuit

  • Intake air temperature sensor (built into mass air flow meter)

  • ECM
Table 3. Related Data List
DTC No. Data List
P0112 Intake Air
P0113
Tip:

  • If DTC P0112 or P0113 is stored, the following symptoms may appear:


    • Misfire

    • Combustion noise

    • Black smoke

    • White smoke

    • Lack of power

  • When DTC P0112 or P0113 is stored, check the intake air temperature by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Intake Air.

Temperature Displayed Malfunction
-40°C (-40°F) Open circuit
140°C (284°F) Short circuit
Table 4. *a Intake Air Temperature Sensor (Built into Mass Air Flow Meter)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

Tip:

  • 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.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (INTAKE AIR)


    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.

    4. Read the value.

      OK
      Same as actual intake air temperature.
      Table 5. Result
      Result Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      Same as actual intake air temperature C
      Tip:

      • 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 higher.


  2. Click here

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


    1. A01VG0XE02

      Disconnect the mass air flow meter connector.

    2. Connect terminals THA and E2 of the mass air flow meter 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.

    6. Read the value.

      Standard value
      140°C (284°F) or higher
      Table 6. Text in Illustration
      *1 Mass Air Flow Meter
      *2 ECM
      *a

      Front view of wire harness connector

      (to Mass Air Flow Meter)

  3. Click here

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter 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
      A28-4 (THA) - A59-30 (THA) Always Below 1 Ω
      A28-5 (E2) - A59-31 (ETHA) Always Below 1 Ω

  4. Click here

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


    1. Disconnect the mass air flow meter connector.

    2. A01VKTQE35

      Connect the intelligent tester to the DLC3.

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

    4. Reconnect the mass air flow meter connector.

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

    6. Read the value.

      Standard value
      -40°C (-40°F)
      Table 7. Text in Illustration
      *1 Mass Air Flow Meter
      *2 ECM

  5. Click here

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter 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
      A28-4 (THA) or A59-30 (THA) - Body ground Always 10 kΩ or higher

  6. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  7. Click here

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter (Click here).


  8. Click here

    REPAIR OR REPLACE 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 MASS AIR FLOW METER


    1. Replace the mass air flow meter (Click here).


  11. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs (Click here).

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON and wait for 15 seconds or more.

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

    7. Confirm that the pending DTC is not output again.


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