ECD SYSTEM (w/o DPF), 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, built into the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the air temperature is high, the resistance decreases. The variations in resistance are communicated to the ECM as change in voltage (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.

The 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 changes in the intake air temperature, the voltage at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve the driveability during cold engine operation.

A01BBBAE03
DTC No. DTC Detection Condition Trouble Area
P0110

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

Short in intake air temperature sensor circuit for 0.5 seconds

(sensor resistance value less than 79 Ω)

(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

(sensor resistance value more than 156 kΩ)

(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 DTC P0110, P0112, or P0113 is detected, check the intake air temperature by selecting the following menu items on an intelligent tester: Powertrain / Engine / Data List / Intake Air.

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

WIRING DIAGRAM

A01BB6IE22

INSPECTION PROCEDURE

Note

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

Tech Tips


  • If different DTCs related 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 an intelligent tester. Freeze frame data record 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)


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / Data List / Intake Air.

    4. Read the value.

      OK
      Same value as the actual air temperature.
      Result
      Temperature Displayed Proceed To
      -40°C (-40°F) A
      140°C (284°F) B
      OK (same as air temperature near air cleaner case) 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

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

    C

    CHECK FOR INTERMITTENT PROBLEMS

    A

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


    1. A01BGGYE07

      Disconnect the A27 mass air flow meter connector.

    2. Connect terminals 4 and 5 of the intake air temperature sensor wire harness side connector.

    3. Connect an intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester ON.

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

    6. Read the value.

      OK
      140°C (284°F)

    7. Reconnect the mass air flow meter connector.


    OK

    REPLACE MASS AIR FLOW METER

    NG

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


    1. A01BAXIE40

      Disconnect the A27 mass air flow meter connector.

    2. Connect terminals THA and E2 of the D1 ECM connector.

      Tech Tips

      Before checking, perform a visual and contact pressure check on the ECM connector.

    3. Connect an intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester ON.

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

    6. Read the value.

      OK
      140°C (284°F)

    7. Reconnect the mass air flow meter connector.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM

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


    1. A01BCZFE47

      Disconnect the A27 mass air flow meter connector.

    2. Connect an intelligent tester to the DLC3.

    3. Turn the ignition switch to ON and turn the tester ON.

    4. Select the following menu items: Powertrain / Engine / Data List / Intake Air.

    5. Read the value.

      OK
      -40°C (-40°F)

    6. Reconnect the mass air flow meter connector.


    OK

    REPLACE MASS AIR FLOW METER

    NG

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


    1. A01BF0TE29

      Disconnect the A27 mass air flow meter connector.

    2. Disconnect the D1 ECM connector.

    3. Connect an intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester ON.

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

    6. Read the value.

      OK
      -40°C (-40°F)

    7. Reconnect the mass air flow meter connector.

    8. Reconnect the ECM connector.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE ECM