SFI SYSTEM, Diagnostic DTC:P0110, P0112, P0113

DTC Code DTC Name
P0110 Intake Air Temperature Circuit
P0112 Intake Air Temperature Circuit Low Input
P0113 Intake Air Temperature Circuit High Input

DESCRIPTION

The intake air temperature sensor, mounted on the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (see Fig. 1).

The intake air temperature sensor is powered by a 5 V applied from the THA terminal of the ECM, 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, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve drivability.

A017G65E06

Tech Tips

When any of DTCs P0110, P0112 and P0113 are set, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No. Proceed to DTC Detection Condition Trouble Area
P0110 Step 1 Open or short in intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic)

  • Open or short in intake air temperature sensor circuit

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

  • ECM
P0112 Step 4 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 Step 2 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 selecting the following menu items 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) or higher Short circuit

WIRING DIAGRAM

A017ELHE06

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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Select the following menu items: Powertrain / Engine and ECT / 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) or higher 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) or higher.


    B

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

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. A017EYZE07

      Confirm the connection at mass air flow meter.

    2. Disconnect the mass air flow meter connector.

    3. Connect terminals THA and E2 of the mass air flow meter wire harness side connector.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch on (IG).

    6. Turn the tester on.

    7. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    8. Read the value displayed on the tester.

      Standard
      140°C (284°F) or higher

    9. Reconnect the mass air flow meter connector.


    NG

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) Click here

    OK

    REPLACE MASS AIR FLOW METER Click here

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


    1. A017FBKE18

      Confirm the connection at ECM.

    2. Disconnect the mass air flow meter connector.

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

      Tech Tips

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

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch on (IG).

    6. Turn the tester on.

    7. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    8. Read the value displayed on the tester.

      Standard
      140°C (284°F) or higher

    9. Reconnect the mass air flow meter connector.


    NG

    REPLACE ECM Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. A017FL1E87

      Disconnect the mass air flow meter connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch on (IG).

    4. Turn the tester on.

    5. Select the following menu items: Powertrain / Engine and ECT / 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

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM) Click here

    OK

    REPLACE MASS AIR FLOW METER Click here

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


    1. A017DR2E17

      Disconnect the ECM connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch on (IG).

    4. Turn the tester on.

    5. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    6. Read the value displayed on the tester.

      Standard
      -40°C (-40°F)

    7. Reconnect the ECM connector.


    NG

    REPLACE ECM Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR