Nissan GT-R (R35) · Service Manual ENGINE

P0197, P0198 EOT SENSOR

VR38

P0197 P0198

Description


The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine oil temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

SEF594K.JPG

<Reference data>

SEF012P.JPG

Engine oil temperature
[°C (°F)]
Voltage*　(V)
Resistance　(kΩ)
–10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.1 - 2.5
50 (122)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
110 (230)
0.6
0.143 - 0.153
*: These data are reference values and are measured between ECM terminals 27 (Engine oil temperature sensor) and 26 (Sensor ground).

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble Diagnosis Name
 		DTC Detecting Condition
 		Possible Cause
P0197
 		Engine oil temperature sensor circuit low input
 		An excessively low voltage from the sensor is sent to ECM.
  • Harness or connectors
    (The sensor circuit is open or shorted.)
  • Engine oil temperature sensor
P0198
 		Engine oil temperature sensor 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 EOT SENSOR POWER SUPPLY CIRCUIT
 
 3.DETECT MALFUNCTIONING PART
 
 4.CHECK EOT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
 
 5.DETECT MALFUNCTIONING PART
 
 6.CHECK ENGINE OIL TEMPERATURE SENSOR
 
 7.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK ENGINE OIL TEMPERATURE SENSOR