ECD SYSTEM(w/o EGR Cooler), Diagnostic DTC:P0112, P0113

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

DESCRIPTION

The intake air temperature sensor is built into the mass air flow meter sub-assembly 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.

B003MQLE05
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0112 Intake Air Temperature Circuit Low Input 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 sub-assembly)

  • ECM

 Comes on DTC stored
P0113 Intake Air Temperature Circuit High Input 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 sub-assembly)

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List
P0112 Intake Air
P0113

Tech Tips


  • 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.

    Reference
    GTS Displayed Malfunction
    -40°C (-40°F) Open circuit
    140°C (284°F) or higher Short circuit

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P0112 Ignition switch ON for 1 second or more
P0113

WIRING DIAGRAM

Refer to DTC P0100.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Read freeze frame data using the GTS. 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 GTS (INTAKE AIR)


    1. Connect the GTS to the DLC3.

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

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Intake Air

    4. Read the value.

      OK
      Same as actual intake air temperature
      Result
      Result Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      OK (same as actual intake air temperature) C

      Tech Tips


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

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


    B

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

    C

    GO TO STEP 8 Click here

    A

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


    1. Disconnect the mass air flow meter sub-assembly connector.

      B003MK3C10
      *1 Mass Air Flow Meter Sub-assembly *2 ECM
      *a

      Front view of wire harness connector

      (to Mass Air Flow Meter Sub-assembly)

      		 - -

    2. Connect terminals 4 (THA) and 2 (E2G) of the mass air flow meter sub-assembly wire harness side connector.

    3. Connect the GTS to the DLC3.

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

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Intake Air

    6. Read the value.

      OK
      140°C (284°F) or higher

    7. Reconnect the mass air flow meter sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) Click here

    OK

  3. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER SUB-ASSEMBLY.


    1. Replace the mass air flow meter sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)


    1. Disconnect the mass air flow meter sub-assembly 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
      A29-4 (THA) - C39-32 (THA) Always Below 1 Ω
      A29-2 (E2G) - C39-24 (EVG) Always Below 1 Ω

    4. Reconnect the mass air flow meter sub-assembly connector.

    5. Reconnect the ECM connector.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 11 Click here

    OK

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


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  6. READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)


    1. B003M64C35
      *1 Mass Air Flow Meter Sub-assembly
      *2 ECM

      Disconnect the mass air flow meter sub-assembly connector.

    2. Connect the GTS to the DLC3.

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

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Intake Air

    5. Read the value.

      OK
      -40°C (-40°F)

    6. Reconnect the mass air flow meter sub-assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) Click here

    OK

  7. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    3. Turn the ignition switch to ON for 1 second or more.

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

    5. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END

  9. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)


    1. Disconnect the mass air flow meter sub-assembly 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
      A29-4 (THA) or C39-32 (THA) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the mass air flow meter sub-assembly connector.

    5. Reconnect the ECM connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  10. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  11. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here