GSIC - Global Service Information Center

### 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

## for Preparation Click here

## DESCRIPTION

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

## 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 (Click here).

1.CHECK ECM (THIA VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connector.

   Standard voltage:

     Tester Connection | Condition | Specified Condition
     E8-20 (THIA) - E8-28 (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

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)

1. Disconnect the I4 diesel turbo IAT sensor connector.

1. Disconnect the E8 ECM connector.

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

   Standard resistance:

     Tester Connection | Specified Condition
     E8-20 (THIA) - I4-2 | Below 1 Ω
     E8-28 (E2) - I4-1 | Below 1 Ω
     E8-20 (THIA) or I4-2 - Body ground | 10 kΩ or higher
     E8-28 (E2) or I4-1 - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

REPLACE ECM