Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM
READ VALUE OF DIESEL TURBO INLET AIR TEMPERATURE SENSOR
CHECK DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR)
CHECK HARNESS AND CONNECTOR (DIESEL TURBO IAT SENSOR - ECM)
CHECK DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)
CHECK HARNESS AND CONNECTOR (DIESEL TURBO IAT SENSOR - ECM)
DTC P0095 Intake Air Temperature Sensor 2 Circuit
DTC P0097 Intake Air Temperature Sensor 2 Circuit Low
DTC P0098 Intake Air Temperature Sensor 2 Circuit High
DESCRIPTION
The diesel turbo Intake Air Temperature (IAT) sensor is built into the charge air cooler and senses the IAT. A built-in thermistor in the sensor changes its resistance value according to the intake air temperature. The lower the intake air temperature, the greater 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.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0095 | Open or short in diesel turbo IAT sensor circuit for 0.5 seconds (1 trip detection logic) |
Open or short in diesel turbo IAT sensor circuit Diesel turbo IAT sensor ECM |
| P0097 | 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) |
Open or short in diesel turbo IAT sensor circuit Diesel turbo IAT sensor ECM |
| P0098 | 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) |
Open or short in diesel turbo IAT sensor circuit Diesel turbo IAT sensor ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration and initialization .
- HINT:
- If DTCs relating to different systems are output, and they share terminal E2 as their ground, check this ground circuit first.
| 1.READ VALUE OF DIESEL TURBO INLET AIR TEMPERATURE SENSOR |
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).
Read the value.
- OK:
- Same value as the actual intake air temperature.
- Result:
Temperature Displayed Proceed to -40°C (-40°F) A 140°C (284°F) or more B OK (same as air temperature near to intake manifold) C
- HINT:
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| A | |
| 2.CHECK DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR) |
Confirm good connection at the sensor.
Disconnect the E60 diesel turbo intake air temperature (IAT) sensor connector.
Connect terminals 1 and 2 of the diesel turbo IAT sensor wire harness side connector.
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).
Read the value.
- Standard:
- 140°C (284°F) or more.
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| NG | |
| 3.CHECK HARNESS AND CONNECTOR (DIESEL TURBO IAT SENSOR - ECM) |
Disconnect the E60 diesel turbo IAT sensor connector.
Disconnect the E59 ECM connector.
Measure the resistance.
- Standard resistance:
Tester Connections Specified Conditions THIA (E60-2) - THIA (E59-113) Below 1 Ω E2 (E60-1) - ETHI (E59-90)
Reconnect the diesel turbo IAT sensor connector.
Reconnect the ECM connector
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| OK | ||
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| 4.CHECK DIESEL TURBO INTAKE AIR TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR) |
Confirm good connection at the sensor.
Disconnect the E60 diesel turbo IAT sensor connector.
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / Data List / Intake Air Temp (Turbo).
Read the value.
- Standard:
- -40°C (-40°F) or more.
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| NG | |
| 5.CHECK HARNESS AND CONNECTOR (DIESEL TURBO IAT SENSOR - ECM) |
Disconnect the E60 diesel turbo IAT sensor connector.
Disconnect the E59 ECM connector.
Measure the resistance.
- Standard resistance:
Tester Connections Specified Conditions THIA (E60-2) - THIA (E59-113) 10 kΩ or higher
Reconnect the diesel turbo IAT sensor connector.
Reconnect the ECM connector
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| OK | ||
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