Cherokee 2WD L4-150 2.5L VIN P MFI (1991)
Charge Temperature Sensor: Testing and Inspection
IAT And TPS Sensors
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 Manifold Air Temperature (MAT) 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
