2Kd-Ftv Engine Control. Dtc P0110 Intake Air Temperature Circuit

The intake air temperature sensor is built into the mass air flow meter and detects the intake air temperature.
A thermistor built into the sensor changes its resistance value according to the intake air temperature.
The lower the intake air temperature, the higher the thermistor resistance value. The higher the intake air temperature, the lower the thermistor resistance value (See Fig. 1).
The intake air temperature sensor is connected to the ECM.
The 5 V power source voltage from the ECM is applied to the intake air temperature sensor from terminal THA 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 in accordance with the intake air temperature, the voltage at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability with a cold engine.
Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Kd-Ftv Engine Control.Ecd System (For Dpf).
Dtc
P0110 Intake Air Temperature Circuit

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Kd-Ftv Engine Control.Ecd System (For Dpf).
Dtc
P0110 Intake Air Temperature Circuit

P0110
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 0.5 seconds	Open or short the IAT sensor for 0.5 seconds (1 trip detection logic).	Open or short in IAT sensor circuit IAT sensor (built into mass air flow meter) ECM

P0112
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 0.5 seconds	Short in the IAT sensor for 0.5 seconds (1 trip detection logic).	Short in IAT sensor circuit IAT sensor (built into mass air flow meter) ECM

P0113
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 0.5 seconds	Open in the IAT sensor for 0.5 seconds (1 trip detection logic).	Open in IAT sensor circuit IAT sensor (built into mass air flow meter) ECM

Related Data List
DTC No.	Data List
P0110	Intake Air
P0112
P0113

HINT:

If DTC P0110, P0112 and/or P0113 is stored, the following symptoms may appear:

Misfire
Combustion noise
Black smoke
White smoke
Lack of power

When DTC P0110, P0112 and/or P0113 is stored, check the intake air temperature by entering the following menus: Powertrain / Engine and ECT / Data List / Intake Air.

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

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

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK03ZX.html) and initialization (HILUX_TGN26 RM000000TIN04BX.html).

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records 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, and other data from the time the malfunction occurred.

1.READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.

Read the value.
OK:
Same as actual intake air temperature

Result
Result
Proceed to
-40°C (-40°F)
A
140°C (284°F) or higher
B
OK (same as actual intake air temperature)
C
HINT:
1. If there is an open circuit, the tester indicates -40°C (-40°F).
2. If there is a short circuit, the tester indicates 140°C (284°F) or higher.

Result
Result	Proceed to
-40°C (-40°F)	A
140°C (284°F) or higher	B
OK (same as actual intake air temperature)	C

Go to step 4

Go to step 11

A

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

w/ mass air flow meter:
1. Disconnect the C36 mass air flow meter connector.
2. Connect terminals 4 and 5 of the mass air flow meter wire harness side connector.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON and turn the intelligent tester ON.
5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
6. Read the values.
  OK:
  140°C (284°F) or more
  Text in Illustration
  *1
  Mass Air Flow Meter
  *2
  ECM
  *a
  Front view of wire harness connector
  (to Mass Air Flow Meter)
7. Reconnect the mass air flow meter connector.

Text in Illustration
*1	Mass Air Flow Meter
*2	ECM
*a	Front view of wire harness connector (to Mass Air Flow Meter)

w/o mass air flow meter:
1. Disconnect the C91 intake air temperature sensor connector.
2. Connect terminals 1 and 2 of the intake air temperature sensor wire harness side connector.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON and turn the intelligent tester ON.
5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
6. Read the values.
  OK:
  140°C (284°F) or more
  Text in Illustration
  *1
  Intake Air Temperature Sensor
  *2
  ECM
  *a
  Front view of wire harness connector
  (to Intake Air Temperature Sensor)
7. Reconnect the intake air temperature sensor connector.

Text in Illustration
*1	Intake Air Temperature Sensor
*2	ECM
*a	Front view of wire harness connector (to Intake Air Temperature Sensor)

Go to step 7

Go to step 3

3.CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

w/ mass air flow meter:
1. Disconnect the mass air flow meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.
  
  Standard Resistance:
  
  w/ mass air flow meter
  Tester Connection
  Condition
  Specified Condition
  C36-4 (THA) - C22-31 (THA)
  Always
  Below 1 Ω
  C36-5 (E2) - C22-28 (E2)
  Always
  Below 1 Ω
4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

w/ mass air flow meter
Tester Connection	Condition	Specified Condition
C36-4 (THA) - C22-31 (THA)	Always	Below 1 Ω
C36-5 (E2) - C22-28 (E2)	Always	Below 1 Ω

w/o mass air flow meter:
1. Disconnect the intake air temperature sensor connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.
  
  w/o mass air flow meter
  Tester Connection
  Condition
  Specified Condition
  C91-2 (THA) - C22-31 (THA)
  Always
  Below 1 Ω
  C91-1 (E2) - C22-28 (E2)
  Always
  Below 1 Ω
4. Reconnect the intake air temperature sensor connector.
5. Reconnect the ECM connector.

w/o mass air flow meter
Tester Connection	Condition	Specified Condition
C91-2 (THA) - C22-31 (THA)	Always	Below 1 Ω
C91-1 (E2) - C22-28 (E2)	Always	Below 1 Ω

Go to step 9

Go to step 8

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

w/ mass air flow meter:
1. Disconnect the mass air flow meter connector.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to ON and turn the tester on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
5. Read the value.
  OK:
  -40°C (-40°F)
  Text in Illustration
  *1
  Mass Air Flow Meter
  *2
  ECM
6. Reconnect the mass air flow meter connector.

Text in Illustration
*1	Mass Air Flow Meter
*2	ECM

w/o mass air flow meter:
1. Disconnect the intake air temperature sensor connector.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to ON and turn the tester on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
5. Read the value.
  OK:
  -40°C (-40°F)
  Text in Illustration
  *1
  Intake Air Temperature Sensor
  *2
  ECM
6. Reconnect the intake air temperature sensor connector.

Text in Illustration
*1	Intake Air Temperature Sensor
*2	ECM

Go to step 10

Go to step 5

5.CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

w/ mass air flow meter:
1. Disconnect the mass air flow meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.
  
  Standard Resistance:
  
  w/ mass air flow meter
  Tester Connection
  Condition
  Specified Condition
  C36-4 (THA) or C22-31 (THA) - Body ground
  Always
  10 kΩ or higher
4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

w/ mass air flow meter
Tester Connection	Condition	Specified Condition
C36-4 (THA) or C22-31 (THA) - Body ground	Always	10 kΩ or higher

w/o mass air flow meter:
1. Disconnect the intake air temperature sensor connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.
  
  w/o mass air flow meter
  Tester Connection
  Condition
  Specified Condition
  C91-1 (THA) or C22-31 (THA) - Body ground
  Always
  10 kΩ or higher
4. Reconnect the intake air temperature sensor connector.
5. Reconnect the ECM connector.

w/o mass air flow meter
Tester Connection	Condition	Specified Condition
C91-1 (THA) or C22-31 (THA) - Body ground	Always	10 kΩ or higher

Go to step 8

OK

6.REPLACE ECM

Replace the ECM (HILUX_TGN26 RM0000043H100GX.html).

Go to step 11

7.CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE INTAKE AIR TEMPERATURE SENSOR

Replace the mass air flow meter (w/ mass air flow meter) (HILUX_TGN26 RM000000VHD041X.html).

Replace the intake air temperature sensor (w/o mass air flow meter) (HILUX_TGN26 RM0000014XP017X.html).

Go to step 11

8.REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

Go to step 11

9.CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM.

Replace the ECM (HILUX_TGN26 RM0000043H100GX.html).

Go to step 11

10.REPLACE INTAKE AIR TEMPERATURE SENSOR

Replace the mass air flow meter (w/ mass air flow meter) (HILUX_TGN26 RM000000VHD041X.html).

Replace the intake air temperature sensor (w/o mass air flow meter) (HILUX_TGN26 RM0000014XP017X.html).

NEXT

11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs (HILUX_TGN26 RM000000PDK0SWX.html).

Turn the ignition switch to ON for 1 second.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Confirm that the DTC is not output again.

END