SFI SYSTEM, Diagnostic DTC:P0112, P0113

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

DESCRIPTION

A0162X1E36

DTC No. DTC Detection Condition Trouble Area
P0112

Short in intake air temperature sensor circuit 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

P0113

Open in intake air temperature sensor circuit 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

Tech Tips

When any of these DTCs are set, check the intake air temperature by entering the following menus: Powertrain / Engine / Data List / Intake Air.

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

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor and sets a DTC.

Example:

If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the intake air temperature sensor circuit, and sets DTC P0113. Conversely, if the output voltage is less than 0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0112.

If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

WIRING DIAGRAM

A016098E02

INSPECTION PROCEDURE

Tech Tips


  • If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.


  • 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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester ON.

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

    5. Read the value displayed on the tester.

      Standard
      Same as actual intake air temperature.
      Result
      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) B
      Same as actual intake air temperature C

      Tech Tips


      • 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).


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


    1. A015ZOFE40

      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 engine switch on (IG).

    5. Turn the tester ON.

    6. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    7. Read the value displayed on the tester.

      Standard
      140°C (284°F)
    8. Reconnect the mass air flow meter connector.


    NG
    OK
  3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)


    1. A0161FIE06

      Disconnect the mass air flow meter connector.

    2. Connect terminals THA and E2 of the ECM connector.

      Tech Tips

      Before checking, do visual and contact pressure checks on the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the tester ON.

    6. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    7. Read the value displayed on the tester.

      Standard
      140°C (284°F)
    8. Reconnect the mass air flow meter connector.


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

    A015ZN8E76

    1. Disconnect the mass air flow meter connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the tester ON.

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

    6. Read the value displayed on the tester.

      Standard
      -40°C (-40°F)
    7. Reconnect the mass air flow meter connector.


    NG
    OK
  5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)


    1. A0160KTE07

      Disconnect the mass air flow meter connector.

    2. Disconnect the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the tester ON.

    6. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    7. Read the value displayed on the tester.

      Standard
      -40°C (-40°F)
    8. Reconnect the mass air flow meter connector.


    NG
    OK