Engine Performance
Work Example 7

WorkKey Level: 3
NATEF Automotive Tasks: VIII.B.3, VIII.B.4, VIII.B.6

An engine is operating at 70ºC and the coolant temperature sensor has a resistance of 3,400 Ohms.  Is this a logical temperature resistance temperature relationship?

Coolant Temperature Sensor
Temperature to Resistance Values (Approximate)

ºF	ºC	Ohms
210	100	185
160	70	450
100	38	1,600
70	20	3,400
40	–4	7,500
20	–7	13,500
0	–18	25,000
–40	–40	100,700

 

 

 

 

 

 

 

Solution:

No. Reading from the chart, for 70°C, the number of Ohms should be approximately 450.