Nissan GT-R (R35) · Service Manual ENGINE

P0112, P0113 IAT SENSOR

VR38

P0112 P0113

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
P0112
 		Intake air temperature sensor (bank 1) circuit low input
 		An excessively low voltage from the sensor is sent to ECM.
  • Harness or connectors
    (The sensor circuit is open or shorted.)
  • Intake air temperature sensor
P0113
 		Intake air temperature sensor (bank 1) circuit high input
 		An excessively high voltage from the sensor is sent to ECM.

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
 
 3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
 
 4.CHECK INTAKE AIR TEMPERATURE SENSOR
 
 5.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK INTAKE AIR TEMPERATURE SENSOR