P0127

DTC P0127 IAT SENSOR

Component Description






The intake air temperature sensor is built-into the 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 rise in temperature.





[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

1.Wait until engine coolant temperature is less than 96�C (205�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 96�C (205�F), turn ignition switch OFF and cool down engine.
- Perform the following steps before engine coolant temperature is above 96�C (205�F).
2.Turn ignition switch ON.
3.Select "DATA MONITOR" mode with CONSULT.
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 .

WITH GST

Follow the procedure "With CONSULT" above.


Diagnosis Procedure


1. CHECK GROUND CONNECTIONS

1.Turn ignition switch OFF.
2.Loosen and retighten ground screw on the body.
Power Supply And Ground Circuit.










OK or NG
OK- GO TO 2.
NG- Repair or replace ground connections.

2. CHECK INTAKE AIR TEMPERATURE SENSOR

.
OK or NG
OK- GO TO 3.
NG- Replace mass air flow sensor (with intake air temperature sensor). Component.

3. CHECK INTERMITTENT INCIDENT

Refer to Initial Inspection and Diagnostic Overview
-INSPECTION END


Component Inspection


INTAKE AIR TEMPERATURE SENSOR






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





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