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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 meter and detects 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 higher 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 from 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 the intake air temperature, the voltage at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability with a cold engine.

Table 1. P0112
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 0.5 seconds Short in the intake air temperature sensor for 0.5 seconds (1 trip detection logic).
  • Short in intake air temperature sensor circuit

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

  • ECM

Table 2. P0113
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 0.5 seconds Open in the intake air temperature sensor for 0.5 seconds (1 trip detection logic).
  • Open in intake air temperature sensor 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 and/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: Powertrain / Engine and ECT / Data List / Intake Air.

    Table 4. Reference
    Temperature Displayed Malfunction
    -40°C (-40°F) Open circuit
    140°C (284°F) or higher Short circuit
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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).

  • After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).

  • After replacing an injector assembly, the ECM needs registration (See PageClick here).

Tip:

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)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) 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
      OK (same as actual intake air temperature) 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 higher.


  2. Click here

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


    1. A01DT6CE09

      Disconnect the mass air flow meter connector.

    2. Connect terminals 1 (THA) and 2 (E2) of the mass air flow meter wire harness side connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG) and turn the tester on.

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

    6. Read the value.

      OK
      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)

    7. Reconnect the mass air flow meter connector.


  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
      C33-1 (THA) - C90-6 (THA) Always Below 1 Ω
      C33-2 (E2) - C90-12 (ETHA) Always Below 1 Ω
    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


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


    1. A01DQ92E05

      Disconnect the mass air flow meter connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and turn the tester on.

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

    5. Read the value.

      OK
      -40°C (-40°F)
      Table 7. Text in Illustration
      *1 Mass Air Flow Meter
      *2 ECM
    6. Reconnect the mass air flow meter connector.


  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
      C33-1 (THA) or C90-6 (THA) - Body ground Always 10 kΩ or higher
    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


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    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).


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    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 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. Clear the DTCs (Click here).

    3. Turn the engine switch on (IG) for 1 second.

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

    5. Confirm that the DTC is not output again.


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    END