Cherokee 2WD L4-150 2.5L VIN P MFI (1991)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Coolant Temperature Sensor
CAUTION: A high input impedance digital volt-ohm meter (DVOM) is required when testing sensors on these vehicles. A low input impedance
meter could seriously damage certain components of this system.
Disconnect the coolant temperature sensor electrical connector, and check the resistance across its two terminals. The resistance should be less than
1,000 ohms when the engine is at normal operating temperature. See the following resistance chart to verify that the coolant temperature sensor is within
its range.
Temperature-to-Resistance Values
(Approximate)
~F
~C
Ohms
212
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
