Dtc P0110 Intake Air Temperature Circuit Malfunction

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

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)

READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

DTC P0110 Intake Air Temperature Circuit Malfunction

DTC P0112 Intake Air Temperature Circuit Low Input

DTC P0113 Intake Air Temperature Circuit High Input


DESCRIPTION

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0110 Intake Air Temperature Circuit Malfunction
  1. 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).
  2. The IAT sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
  3. 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.
    HINT:
    When any of DTCs P0110, P0112 and P0113 are stored, the ECM enters fail-safe mode. During fail-safe mode, the IAT is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.
DTC Detection Condition
Trouble Area
P0110
Open or short in IAT sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM
P0112
Short in IAT sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Short in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM
P0113
Open in IAT sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open in IAT sensor circuit
  2. IAT sensor (built into MAF meter)
  3. ECM

HINT:
When any of these DTCs are stored, check the IAT by entering the following menus on the Techstream: Powertrain / Engine and ECT / Intake Air.

Temperature Displayed
Malfunction
-40°C (-40°F)
Open circuit
128°C (262°F) or higher
Short circuit

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to calculate the IAT. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the IAT sensor and stores a DTC.
Example:
If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the IAT sensor circuit, and stores DTC P0113. Conversely, if the output voltage is less than 0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and stores DTC P0112.
If the malfunction is not repaired successfully, a DTC is stored 0.5 seconds after the engine is next started.

MONITOR STRATEGY


Related DTCs
P0110: IAT sensor range check (Fluctuating)
P0112: IAT sensor range check (Low voltage)
P0113: IAT sensor range check (High voltage)
Required Sensors/Components (Main)
IAT sensor
Required Sensors/Components (Related)
-
Frequency of Operation
Continuous
Duration
0.5 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor runs whenever following DTCs not stored
None

TYPICAL MALFUNCTION THRESHOLDS


P0110:
IAT sensor voltage
Less than 0.18 V [More than 128°C (262°F)], or more than 4.91 V [Less than -55°C (-67°F)]

P0112:
IAT sensor voltage [IAT]
Less than 0.18 V [More than 128°C (262°F)]

P0113:
IAT sensor voltage [IAT]
More than 4.91 V [Less than -55°C (-67°F)]

COMPONENT OPERATING RANGE


IAT sensor voltage [IAT]
0.18 to 4.91 V [-55°C to 128°C (-67°F to 262°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.
  6. Wait for 0.5 seconds or more.
  7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  8. 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.
  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P0110, P0112 or P0113.
  11. 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.
  12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (YARIS_NCP93 RM000000PDK0QGX.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


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0110 Intake Air Temperature Circuit Malfunction


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.READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)

  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 / Intake Air.

  1. Read the value displayed on the Techstream.

    OK:
    Same as actual Intake Air Temperature (IAT).

    Result
    Temperature Displayed
    		Proceed To
    -40 °C (-40°F)
    		A
    128°C (262°F) or higher
    		B
    Same as actual IAT
    		C
    HINT:
    1. If there is an open circuit, the Techstream indicates -40°C (-40°F).
    2. If there is a short circuit, the Techstream indicates 128°C (262°F) or higher.


B
Go to step 4

C
CHECK FOR INTERMITTENT PROBLEMS (YARIS_NCP93 RM000000PDQ0NOX.html)
A


2.READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0110 Intake Air Temperature Circuit Malfunction

  1. Disconnect the C26 Mass Air Flow (MAF) meter connector.

  1. Connect terminals THA and E2 of the MAF meter wire harness side connector.

  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 / Intake Air.

  1. Read the value displayed on the Techstream.

    Standard Value:
    128°C (262°F) or higher

  1. Reconnect the MAF meter connector.



NG
Go to step 3
OK

CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000001D0L00WX.html)

3.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0110 Intake Air Temperature Circuit Malfunction

  1. Disconnect the C26 MAF meter connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    THA (C26-4) - THA (C20-65)
    		Below 1 Ω
    E2 (C26-5) - ETHA (C20-88)

  1. Reconnect the MAF meter connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

4.READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0110 Intake Air Temperature Circuit Malfunction

  1. Disconnect the C26 MAF meter connector.

  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 / Intake Air.

  1. Read the value displayed on the Techstream.

    Standard Value:
    -40°C (-40°F)

  1. Reconnect the MAF meter connector.



NG
Go to step 5
OK

REPLACE MASS AIR FLOW METER (YARIS_NCP93 RM000001D0L00WX.html)

5.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0110 Intake Air Temperature Circuit Malfunction

  1. Disconnect the C26 MAF meter connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    THA (C26-4) or THA (C20-65) - Body ground
    		10 kΩ or higher

  1. Reconnect the MAF meter connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)