Dtc P1496 Intake Air Temperature Sensor 1 Circuit Low


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE [TURBO])

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

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

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

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

REPLACE ECM

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO)

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P1496 Intake Air Temperature Sensor 1 Circuit Low

DTC P1497 Intake Air Temperature Sensor 1 Circuit High


DESCRIPTION

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. Dtc P1496 Intake Air Temperature Sensor 1 Circuit Low
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.

P1496
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 1 second
Short in the intake air temperature sensor (turbo) circuit for 0.5 seconds (1 trip detection logic).
  1. Short in intake air temperature sensor (turbo) circuit
  2. Intake air temperature sensor (turbo)
  3. ECM

P1497
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 1 second
Open in the intake air temperature sensor (turbo) circuit for 0.5 seconds (1 trip detection logic).
  1. Open in intake air temperature sensor (turbo) circuit
  2. Intake air temperature sensor (turbo)
  3. ECM

Related Data List
DTC No.
Data List
P1496
Intake Air Temp (Turbo)
P1497
HINT:
  1. If DTC P1496 or P1497 is stored, the following symptoms may appear:
    1. Misfire
    2. Combustion noise
    3. Black smoke
    4. White smoke
    5. Lack of power

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. Dtc P1496 Intake Air Temperature Sensor 1 Circuit Low


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.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])

  1. Connect the intelligent tester to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

  1. 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.


B
Go to step 4

C
Go to step 11
A


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. Dtc P1496 Intake Air Temperature Sensor 1 Circuit Low

  1. Disconnect the intake air temperature sensor (turbo) connector.

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

  1. Connect the intelligent tester to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

  1. 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))

  1. Reconnect the intake air temperature sensor (turbo) connector.



OK
Go to step 7

NG
Go to step 3

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

  1. Disconnect the intake air temperature sensor (turbo) connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C84-2 - C90-3 (THIA)
    		Always
    		Below 1 Ω
    C84-1 - C90-9 (ETHI)
    		Always
    		Below 1 Ω

  1. Reconnect the intake air temperature sensor (turbo) connector.

  1. Reconnect the ECM connector.



OK
Go to step 9

NG
Go to step 8

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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. Dtc P1496 Intake Air Temperature Sensor 1 Circuit Low

  1. Disconnect the intake air temperature sensor (turbo) connector.

  1. Connect the intelligent tester to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air Temp (Turbo).

  1. Read the value.

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

  1. Reconnect the intake air temperature sensor (turbo) connector.



OK
Go to step 10

NG
Go to step 5

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

  1. Disconnect the intake air temperature sensor (turbo) connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C84-2 or C90-3 (THIA) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the intake air temperature sensor (turbo) connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


6.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002CX.html).



NEXT
Go to step 11

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

  1. Replace the intake air temperature sensor (turbo) (LandCruiser RM0000014XP02AX.html).



NEXT
Go to step 11

8.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.



NEXT
Go to step 11

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

  1. Replace the ECM (LandCruiser RM0000013Z002CX.html).



NEXT
Go to step 11

10.REPLACE INTAKE AIR TEMPERATURE SENSOR (TURBO)

  1. Replace the intake air temperature sensor (turbo) (LandCruiser RM0000014XP02AX.html).


NEXT


11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Turn the ignition switch off for 30 seconds or more.

  1. Turn the ignition switch to ON for 1 second.

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

  1. Confirm that the DTC is not output again.


NEXT

END