1Kd-Ftv Engine Control. Dtc P0095 Intake Air Temperature Sensor 2 Circuit

The Intake Air Temperature (IAT) sensor detects the IAT after the intake air passes through the intercooler. A built-in thermistor in 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 sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the sensor from terminal THIA via resistor R. Resistor R and the sensor are connected in series. When the resistance value of the sensor changes in accordance with changes in the IAT, the potential at terminal THIA also changes. Based on this signal, the ECM corrects the fuel injection volume to improve driveability with a cold engine.

P0095
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 1 second	Open or short in the intake air temperature sensor (turbo) circuit for 0.5 seconds (1 trip detection logic).	Open or short in intake air temperature sensor (turbo) circuit Intake air temperature sensor (turbo) ECM

P0097
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 1 second	Short in the intake air temperature sensor (turbo) circuit for 0.5 seconds (1 trip detection logic).	Short in intake air temperature sensor (turbo) circuit Intake air temperature sensor (turbo) ECM

P0098
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 1 second	Open in the intake air temperature sensor (turbo) circuit for 0.5 seconds (1 trip detection logic).	Open in intake air temperature sensor (turbo) circuit Intake air temperature sensor (turbo) ECM

Related Data List
DTC No.	Data List
P0095	Intake Air Temp (Turbo)
P0097
P0098

HINT:

If DTC P0095, P0097 and/or P0098 is stored, the following symptoms may appear:

Misfire
Combustion noise
Black smoke
White smoke
Lack of power

When DTC P0095, P0097 and/or P0098 is stored, check the intake air temperature by entering the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

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 RM0000012XK05BX.html) and initialization (HILUX_TGN26 RM000000TIN04CX.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 [TURBO])

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 Temp (Turbo).

Read the value.
OK:
Same as air temperature near intake manifold

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

Go to step 4

Go to step 11

A

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

Disconnect the intake air temperature sensor (turbo) connector.

Connect terminals 1 and 2 of the intake air temperature sensor (turbo) wire harness side connector.

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 Temp (Turbo).

Read the value.
OK:
140°C (284°F) or higher
Text in Illustration
*1
Intake Air Temperature Sensor (Turbo)
*2
ECM
*a
Front view of wire harness connector
(to Intake Air Temperature Sensor [Turbo])

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

Reconnect the intake air temperature sensor (turbo) connector.

Go to step 7

Go to step 3

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

Disconnect the intake air temperature sensor (turbo) connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection
Condition
Specified Condition
C18-2 - C22-20 (THIA)
Always
Below 1 Ω
C18-1 - C22-28 (E2)
Always
Below 1 Ω

Reconnect the intake air temperature sensor (turbo) connector.

Reconnect the ECM connector.

Go to step 9

Go to step 8

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

Disconnect the intake air temperature sensor (turbo) connector.

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 Temp (Turbo).

Read the value.
OK:
-40°C (-40°F)
Text in Illustration
*1
Intake Air Temperature Sensor (turbo)
*2
ECM

Text in Illustration
*1	Intake Air Temperature Sensor (turbo)
*2	ECM

Reconnect the intake air temperature sensor (turbo) connector.

Go to step 10

Go to step 5

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

Disconnect the intake air temperature sensor (turbo) connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection
Condition
Specified Condition
C18-2 or C22-20 (THIA) - Body ground
Always
10 kΩ or higher

Reconnect the intake air temperature sensor (turbo) connector.

Reconnect the ECM connector.

Go to step 8

OK

6.REPLACE ECM

Replace the ECM (HILUX_TGN26 RM0000013Z001IX.html).

Go to step 11

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

Replace the intake air temperature sensor (turbo) (HILUX_TGN26 RM0000014XP019X.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 RM0000013Z001IX.html).

Go to step 11

10.REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO)

Replace the intake air temperature sensor (turbo) (HILUX_TGN26 RM0000014XP019X.html).

NEXT

11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs (HILUX_TGN26 RM000000PDK0XBX.html).

Turn the ignition switch off for 30 seconds or more.

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

Tester Connection	Condition	Specified Condition
C18-2 - C22-20 (THIA)	Always	Below 1 Ω
C18-1 - C22-28 (E2)	Always	Below 1 Ω