P0110

P0110 INTAKE AIR TEMPERATURE (IAT) SENSOR

Reference Data:

COMPONENT DESCRIPTION
The intake air temperature sensor is built into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM.

The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.

*: These data are reference values and are measured between ECM terminal 99 (Intake air temperature sensor) and body ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic
Malfunction is detected when
(Malfunction A) an excessively low or high voltage from the sensor is sent to ECM,
(Malfunction B) rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signal from engine coolant temperature sensor.

Possible Cause
- Harness or connectors
(The sensor circuit is open or shorted.)
- Intake air temperature sensor

DTC Confirmation Procedure
Perform "PROCEDURE FOR MALFUNCTION A" first. If 1st trip DTC cannot be confirmed, perform "PROCEDURE FOR MALFUNCTION B".

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

With CONSULT-II
1. Turn ignition switch "ON".




2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
Follow the procedure "With CONSULT-II" above.

PROCEDURE FOR MALFUNCTION B

CAUTION: Always drive vehicle at a safe speed.

TESTING CONDITION: This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

With CONSULT-II
1. Wait until engine coolant temperature is less than 90 °C (194 °F).
- Turn ignition switch "ON".
- Select "DATA MONITOR" mode with CONSULT-II.
- Check the engine coolant temperature.
- If the engine coolant temperature is not less than 90 °C (194 °F), turn ignition switch "OFF" and cool down engine.
- Perform the following steps before engine coolant temperature is above 90 °C (194 °F).

2. Turn ignition switch "ON".




3. Select "DATA MONITOR" mode with CONSULT-II.
4. Start engine.
5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
Follow the procedure "With CONSULT-II" above.

EC-IATS-01:

Wiring Diagram

Step 1 - 3:

Step 4 - 5:

Diagnostic Procedure


Component Inspection










INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor terminals 3 and 5 under the following conditions.
2. If NG, replace mass air flow sensor (with intake air temperature sensor).

Removal and Installation
INTAKE AIR TEMPERATURE SENSOR
Refer to "AIR CLEANER AND AIR DUCT"