P0127

DTC P0127 IAT SENSOR





Component Description





The intake air temperature sensor is built into mass air flow sensor
(1). 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.





[Reference data]









On Board Diagnosis Logic









DTC Confirmation Procedure

CAUTION:
Always drive vehicle at a safe speed.

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.
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-III
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-III.
c. 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 d.
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-III.
4. Start engine.
5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to P0127.

WITH GST
Follow the procedure "WITH CONSULT-III" above.




Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body. Ground Inspection.










OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK INTAKE AIR TEMPERATURE SENSOR
P0127.
OK or NG
OK - GO TO 3.
NG - Replace mass air flow sensor (with intake air temperature sensor).
3.CHECK INTERMITTENT INCIDENT
Description
P0112.
- INSPECTION END




Component Inspection

INTAKE AIR TEMPERATURE SENSOR





1. Check resistance between intake air temperature sensor (1) terminals 5 and 6 under the following conditions.





2. If NG, replace mass air flow sensor (with intake air temperature sensor).









Removal and Installation

MASS AIR FLOW SENSOR
Service and Repair.