From VIN # 350001

Reference Data:

Component Description
The intake air temperature sensor is mounted to the air duct housing. 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.

On Board Diagnosis Logic:

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 5 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

With CONSULT
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.

3. Wait at least 5 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
1. Turn ignition switch "ON" and wait at least 5 seconds.
2. Select MODE 7 with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure".

No Tools
1. Turn ignition switch "ON" and wait at least 5 seconds.
2. Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
3. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure".

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
1. Wait until engine coolant temperature is less than 90°C (194°F).
a. Turn ignition switch "ON".
b. Select "DATA MONITOR" mode with CONSULT.
c. Check the engine coolant temperature.
d. 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.
4. Start engine.

5. Hold vehicle speed more than 70 km/h (43 MPH) for 100 consecutive seconds.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
1. Wait until engine coolant temperature is less than 90°C (194°F).
a. Turn ignition switch "ON".
b. Select MODE 1 with GST.
c. Check the engine coolant temperature.
d. 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. Start engine.
3. Hold vehicle speed more than 70 km/h (43 MPH) for 100 consecutive seconds.
4. Select MODE 7 with GST.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure".

No Tools
1. Wait until engine coolant temperature is less than 90°C (194°F).
a. Turn ignition switch "ON".
b. Check voltage between ECM terminal 59 (Engine coolant temperature sensor signal) and ground.

Voltage: More than 1.0 (V)

c. If the voltage is not more than 1.0 (V), turn ignition switch "OFF" and cool down engine.
- Perform the following steps before the voltage is below 1.0 V.
2. Start engine.
3. Hold vehicle speed more than 70 km/h (43 MPH) for 100 consecutive seconds.
4. Turn ignition switch "OFF", wait at least 5 seconds and then turn "OFF".
5. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure".