Toyota Tundra Service Manual: Intake Air Temperature Sensor 1 Circuit Range / Performance (P0111)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Intake Air Temperature Sensor 1 Circuit Range / Performance (P0111)

DESCRIPTION

  • The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT. The IAT sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the IAT 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 IAT sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
  • Resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes, according to changes in the IAT, 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 driveability.

DTC No.

DTC Detection Condition

Trouble Area

P0111

When either condition below is met:

(2 trip detection logic)

  1. The intake air temperature change from the previous trip warm-up to the following trip is small.
  2. The change in the intake air temperature after engine start is less than the threshold value.

Mass air flow meter

MONITOR DESCRIPTION

The ECM performs OBD II monitoring based on the values from the intake air temperature sensor. If there is no change of the sensor value within the normal range, the ECM will not be able to perform OBD II monitoring or will misdiagnose that there is a malfunction in the sensor. The ECM detects the stuck intake air temperature sensor value by performing monitoring after the ignition switch is turned off or the engine is started (short soak or long soak).

MONITOR STRATEGY

Related DTCs

P0111: Intake air temperature sensor rationality (After engine stop)

P0111: Intake air temperature sensor rationality (After cold engine start)

Required Sensors/Components (Main)

Intake Air Temperature (IAT) sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

10 seconds or more

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever following DTCs are not present

P0102, P0103 (Mass air flow meter)

P0112, P0113 (Intake air temperature sensor)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P2610 (Soak timer)

After Engine Stop

Time after engine start

10 seconds or more

Battery voltage

10.5 V or more

ECT change since engine stop

-40°C (-40°F) or more

ECT before engine stop

70°C (158°F) or more

Accumulated MAF amount before engine stop

6754 g or more

Key-off duration

30 minutes

After Cold Engine Start

Key-off duration

5 hours

Time after engine start

10 seconds or more

ECT

70°C (158°F) or more

Accumulated MAF amount

6754 g or more

Either of the following conditions 1 or 2 is met:

-

1. Duration while engine load is low

120 seconds or more

2. Duration while engine load is high

10 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

After Engine Stop

IAT change

Less than 1°C (2°F)

After Cold Engine Start

IAT change

Less than 1°C (2°F)

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].
  7. Idle the engine for 5 minutes or more [C].

    HINT:

    During steps [A] through [C], if the change in the intake air temperature is below 1°C (33.8°F), the intake air temperature sensor (MAF meter) is malfunctioning. It is not necessary to continue this procedure.

  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
  9. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P0111.
  12. Check the DTC judgment result.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [E] and [F].
  13. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [E].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  14. Check the DTC judgment result again [F].

    HINT:

    If the judgment result shows INCOMPLETE or N/A, perform steps [E] and [F] again.

  15. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0112 (See page ).

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0111)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read DTCs.

Result

Result

Proceed to

P0111 and other DTCs are output

A

P0111 is output

B

HINT:

  • If any DTCs other than P0111 are output, troubleshoot those DTCs first.
  • Perform "Inspection After Repair" after replacing the mass air flow meter (See page ).
A

GO TO DTC CHART

B

REPLACE MASS AIR FLOW METER

    Manifold Absolute Pressure / Barometric Pressure Circuit Low Input (P0107,P0108)

    Intake Air Temperature Circuit Low Input (P0112,P0113)

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