Engine Oil Temperature (EOT) Sensor

The Engine Oil Temperature (EOT) sensor measures the temperature of engine oil circulating through the oil gallery. Although the location of the sensor varies, usually it is located nearby the oil pump, mounted on the engine, along with the engine oil pressure sensor. The EOT sensor is checked for any circuit faults by monitoring the input voltage and checked for rationality by comparing the measure EOT value against an inferred EOT value. If any fault is detected during two contiguous trips, then the fault will be indicated.

EOP SENSOR TRANSFER FUNCTION

Volts	Temperature, degrees F	Temperature, degrees C
4.886	-40	-40
4.845	-31	-35
4.792	-22	-30
4.640	-4	-20
4.409	14	-10
4.084	32	0
3.664	50	10
3.173	68	20
2.650	86	30
2.142	104	40
1.685	122	50
1.299	140	60
0.994	158	70
0.757	176	80
0.577	194	90
0.441	212	100
0.339	230	110
0.262	248	120
0.205	266	130
0.161	284	140
0.143	293	145
0.128	302	150

EOT SENSOR CIRCUIT CHECK OPERATION

DTCs	Analog Sensor P0197: Engine Oil Temperature Sensor "A" Circuit Low P0198: Engine Oil Temperature Sensor "A" Circuit High
Monitor Execution	Continuous
Monitor Sequence	None
Sensors OK	Not Applicable
Monitoring Duration	5 seconds to register a malfunction

EOT SENOR CIRCUIT CHECK ENTRY CONDITIONS

Battery voltage > 11.0 volts

TYPICAL EOT CENSOR CIRCUIT CHECK MALFUNCTION THRESHOLDS

Voltage < 0.16 volts or Voltage > 4.93 volts