Nissan GT-R (R35) · Service Manual ENGINE

P0117, P0118 ECT SENSOR

VR38

P0117 P0118

Description


The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant 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.

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<Reference data>

SEF012P.JPG

Engine coolant 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)
2.3
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
*: These data are reference values and are measured between ECM terminals 46 (Engine coolant temperature sensor) and 26 (Sensor ground).

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P0117
 		Engine coolant 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 coolant temperature sensor
P0118
 		Engine coolant 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 ECT SENSOR POWER SUPPLY CIRCUIT
 
 3.CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
 
 4.CHECK ENGINE COOLANT TEMPERATURE SENSOR
 
 5.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK ENGINE COOLANT TEMPERATURE SENSOR