Toyota Venza manuals

Toyota Venza: Intake Air Temperature Sensor Gradient Too High (P0111)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Intake Air Temperature Sensor Gradient Too High (P0111)

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 supply 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 driveability.

DTC No.

DTC Detection Condition

Trouble Area

P0111

Either of the following condition is met (2 trip detection logic).

  • The intake air temperature change from the previous trip warm up to the following trip is small.
  • 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 when the intake air temperature sensor value is stuck 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 sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

-

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

After Engine Stop

All of the following conditions are met

-

Time after engine start

10 seconds or more

Battery voltage

10.5 V or higher

Mass air flow meter circuit fail (P0102, P0103)

Not detected

Intake air temperature sensor circuit fail (P0112, P0113)

Not detected

Engine coolant temperature sensor circuit fail (P0115, P0117, P0118)

Not detected

Soak timer fail (P2610)

Not detected

Engine coolant temperature at ECM started by internal engine off timer

-40°C (-40°F) or higher

Engine coolant temperature before engine stop

70°C (158°F) or higher

Time that mass air flow is low before engine stop

2100 seconds

Accumulated mass air flow amount before engine stop

2580 g or more

Soak time

30 minutes

After Cold Engine Start

All of the following conditions are met

-

Soak time

5 hours or more

Time after engine start

10 seconds or more

Mass air flow meter circuit fail (P0102, P0103)

Not detected

Intake air temperature sensor circuit fail (P0112, P0113)

Not detected

Engine coolant temperature sensor circuit fail (P0115, P0117, P0118)

Not detected

Soak timer fail (P2610)

Not detected

Engine coolant temperature

70°C (158°F) or higher

Accumulated mass air flow amount

2580 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

Intake air temperature change

Less than 1°C (1.8°F)

After Cold Engine Start

Intake air temperature change

Less than 1°C (1.8°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 the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

  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 engine coolant temperature 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 (1.8°F), the intake air temperature sensor (mass air flow meter) is malfunctioning. It is not necessary to continue this procedure.

  8. Enter the following menus: Powertrain / Engine / 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 / Utility / All Readiness.
  11. Input the DTC: P0111.
  12. Check the DTC judgment result.

    Techstream 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 NORMAL, the system is normal.
    • 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 ).


CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

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 / Trouble Codes.

(e) Read the DTCs.

Result

Proceed to

DTC P0111 and other DTCs are output

A

DTC 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

Mass or Volume Air Flow Circuit Low Input (P0102,P0103)
DESCRIPTION The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provi ...

Intake Air Temperature Circuit Low Input (P0112,P0113)
DESCRIPTION The intake air temperature sensor, in the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a res ...

Other materials about Toyota Venza:

Speed Signal Circuit
DESCRIPTION The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU which u ...

Installation
INSTALLATION PROCEDURE 1. INSTALL FRONT SEAT ASSEMBLY (a) Place the front seat assembly in the cabin. NOTICE: Be careful not to damage the vehicle body. (b) Connect each connector under the front seat assembly. (c) Temporarily install the front seat ass ...

Removal
REMOVAL PROCEDURE 1. REMOVE UPPER BACK WINDOW PANEL TRIM 2. REMOVE BACK DOOR PANEL TRIM ASSEMBLY 3. DISCONNECT POWER BACK DOOR ROD (w/ Power Back Door) 4. REMOVE BACK DOOR TRIM COVER LH (w/o Power Back Door) 5. REMOVE BACK DOOR TRIM COVER LH ...

© 2016-2019 Copyright www.tovenza.com

0.2835