Dtc P0111 Intake Air Temperature Sensor Gradient Too High

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

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

DTC P0111 Intake Air Temperature Sensor Gradient Too High


DESCRIPTION

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0111 Intake Air Temperature Sensor Gradient Too High
  1. 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).
  2. The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
  3. 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 condition 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 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
10 seconds or more
MIL Operation
2 driving cycles
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


All
Monitor runs whenever following DTCs not present
None

After Engine Stop
Time after engine start
10 seconds or more
Battery voltage
10.5 V or higher
Engine coolant temperature at ECM started by soak timer
-40°C (-40°F) or higher
Engine coolant temperature before engine stop
70°C (158°F) or higher
Accumulated mass air flow amount before engine stop
3343 g or more
Key-off duration
30 minutes
Mass air flow meter circuit fail (P0102, P0103)
Not detected
Engine coolant temperature sensor circuit (P0115, P0117, P0118)
Not detected
Intake air temperature circuit fail (P0112, P0113)
Not detected
Soak timer circuit fail (P2610)
Not detected

After Cold Engine Start
Key-off duration
5 hours
Time after engine start
10 seconds or more
Engine coolant temperature
70°C (158°F) or higher
Accumulated mass air flow amount
3343 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
Mass air flow meter circuit fail (P0102, P0103)
Not detected
Engine coolant temperature sensor circuit (P0115, P0117, P0118)
Not detected
Intake air temperature circuit fail (P0112, P0113)
Not detected
Soak timer circuit fail (P2610)
Not detected

TYPICAL MALFUNCTION THRESHOLDS


After Engine Stop
Intake air temperature change
Below 1°C (2°F)

After Cold Engine Start
Intake air temperature change
Below 1°C (2°F)

CONFIRMATION DRIVING PATTERN


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0111 Intake Air Temperature Sensor Gradient Too High

  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 procedure).
  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 0°C (0°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 and ECT / Trouble Codes [D].
  9. Read pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. 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.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. 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 (YARIS_NCP93 RM000000PDK0T5X.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0112 (YARIS_NCP93 RM000000PF30KUX_07.html).

INSPECTION PROCEDURE

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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read DTCs.

    Result
    Result
    		Proceed to
    DTC P0111 and other DTCs are output
    		A
    DTC P0111 is output
    		B
    HINT:
    1. If any DTCs other than P0111 are output, troubleshoot those DTCs first.
    2. Perform "Inspection After Repair" after replacing the mass air flow meter (YARIS_NCP93 RM000004NJD006X.html).


B
REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000003VI000HX.html)
A

GO TO DTC CHART (YARIS_NCP93 RM000000PDF0EWX.html)