Dtc P0095/23 Intake Air Temperature Sensor 2 Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ECM (THIA VOLTAGE)

INSPECT DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR

CHECK WIRE HARNESS (ECM - DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR)

DTC P0095/23 Intake Air Temperature Sensor 2 Circuit

DTC P0097/23 Intake Air Temperature Sensor 2 Circuit Low

DTC P0098/23 Intake Air Temperature Sensor 2 Circuit High


DESCRIPTION

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0095/23 Intake Air Temperature Sensor 2 Circuit
The diesel turbo Intake Air Temperature (IAT) sensor is built into the charge air cooler and senses the IAT. A built-in thermistor of the sensor changes the resistance value according to the intake air temperature. The lower the IAT is, the greater the thermistor resistance value becomes, and the higher the temperature is, the lower the resistance value becomes (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 the driveability with a cold engine.

DTC No.
DTC Detection Condition
Trouble Area
P0095/23
Open or short in diesel turbo IAT sensor circuit for 0.5 seconds
(1 trip detection logic)
  1. Open or short in diesel turbo IAT sensor circuit
  2. Diesel turbo IAT sensor
  3. ECM
P0097/23
Short in diesel turbo IAT sensor circuit for 0.5 seconds
(sensor resistance value less than 25 Ω [sensor output voltage less than 0.05 V])
(1 trip detection logic)
  1. Open or short in diesel turbo IAT sensor circuit
  2. Diesel turbo IAT sensor
  3. ECM
P0098/23
Open in diesel turbo IAT sensor circuit for 0.5 seconds
(sensor resistance value more than 156 kΩ [sensor output voltage more than 4.9 V])
(1 trip detection logic)
  1. Open or short in diesel turbo IAT sensor circuit
  2. Diesel turbo IAT sensor
  3. ECM

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0095/23 Intake Air Temperature Sensor 2 Circuit


INSPECTION PROCEDURE

HINT:
  1. If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.
NOTICE:
If the ECM is replaced, the new ECM needs initialization (Toyota Fortuner RM0000012X2005X.html).
1.CHECK ECM (THIA VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0095/23 Intake Air Temperature Sensor 2 Circuit

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E7-20 (THIA) - E7-28 (E2)
    		20°C (68°F)
    		0.5 to 3.4 V


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.INSPECT DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0095/23 Intake Air Temperature Sensor 2 Circuit

  1. Remove the sensor.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Connection
    		Specified Condition
    20°C (68°F)
    		2.21 to 2.65 kΩ
    NOTICE:
    When checking the IAT sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.


NG
REPLACE DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR
OK


3.CHECK WIRE HARNESS (ECM - DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0095/23 Intake Air Temperature Sensor 2 Circuit

  1. Disconnect the I7 sensor connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E7-20 (THIA) - I7-2
    		Below 1 Ω
    E7-28 (E2) - I7-1
    		Below 1 Ω
    E7-20 (THIA) or I7-2 - Body ground
    		10 kΩ or higher
    E7-28 (E2) or I7-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM