Nissan GT-R (R35) · Service Manual ENGINE

P0127 IAT SENSOR

VR38

P0127

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.

PBIA9559J.JPG
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.
NOTE：
ECM uses only the intake air temperature sensor (bank 1) for engine control and self-diagnosis. It does not use the intake air temperature sensor (bank 2).

<Reference data>

SEF012P.JPG

Intake air temperature
　[°C (°F)]
Voltage*　(V)
Resistance　(kΩ)
25 (77)
3.3
1.800 - 2.200
80 (176)
1.2
0.283 - 0.359
*: These data are reference values and are measured between ECM terminals 44 (Intake air temperature sensor) and 22 (Sensor ground).

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P0127
 		Intake air temperature too high
 		Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signal from engine coolant temperature sensor.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Intake air temperature sensor

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK INTAKE AIR TEMPERATURE SENSOR
 
 3.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK INTAKE AIR TEMPERATURE SENSOR