ECD SYSTEM(for DPF), Diagnostic DTC:P0112 and P0113

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

DESCRIPTION

A208462E01

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

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 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 assembly)

  • ECM

Comes on

DTC stored
Table 1. 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 2. Reference

    Temperature 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 0.5 seconds

P0113

WIRING DIAGRAM

A256089E26

CAUTION / NOTICE / HINT

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 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 > Data List

      Tester Display

      Intake Air

    4. Read the value.

      OK

      Same as actual intake air temperature

      Result

      Proceed to

      -40°C (-40°F)

      140°C (284°F) or higher

      OK (same as actual intake air temperature)
      Tip:

      • 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.

    140°C (284°F) or higher

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

    OK (same as actual intake air temperature)

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

    -40°C (-40°F)

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

    1. A128460C03

      *1

      Mass Air Flow Meter Assembly

      *2

      ECM

      *a

      Front view of wire harness connector

      (to Mass Air Flow Meter Assembly)

      Disconnect the mass air flow meter assembly connector.

    2. Connect terminals 4 (THA) and 5 (E2) of the mass air flow meter 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 > Data List

      Tester Display

      Intake Air

    6. Read the value.

      OK

      140°C (284°F) or higher

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

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

    1. Replace the mass air flow meter assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

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

    1. Disconnect the mass air flow meter 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

      B1-4 (THA) - B76-110 (THA)

      Always

      Below 1 Ω

      B1-5 (E2) - B76-87 (ETHA)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

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

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

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

    1. A226261C06

      *a

      Mass Air Flow Meter Assembly

      *b

      ECM

      Disconnect the mass air flow meter 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 > Data List

      Tester Display

      Intake Air

    5. Read the value.

      OK

      -40°C (-40°F)

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  8. REPLACE MASS AIR FLOW METER ASSEMBLY

    1. Replace the mass air flow meter assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

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

    1. Disconnect the mass air flow meter 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

      B1-4 (THA) or B76-110 (THA) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  10. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

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

      Powertrain > Engine > Trouble Codes

    7. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END