Grand Cherokee 2WD V8-318 5.2L VIN Y MFI (1994)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Coolant Temperature Sensor Test
NOTE:
To perform a complete test of the Coolant Temperature Sensor and its circuitry, refer to the DRB II diagnostic tester. Also refer to the appropriate
DIAGNOSTIC CHARTS. To test the sensor only, refer to the following:
PROCEDURE
1.
Turn the ignition key to the OFF position.
2.
Disconnect wire connector from coolant temperature sensor.
NOTE: Engines with air conditioning: When removing the connector from sensor, do not pull directly on wiring harness. Fabricate an L shaped
hook tool from a coat hanger (approximately eight inches long). Place the hook part of tool under the connector for removal. The connector is
snapped onto the sensor. It is not equipped with a lock type tab.
3.
Connect one lead of ohmmeter to one terminal of coolant temperature sensor.
4.
Connect the other lead of ohmmeter to remaining terminal of coolant temperature sensor.
^
For resistance (in ohms) at given temperatures, See SPECIFICATIONS.
^
Replace sensor if resistance readings are incorrect.
...............................................................................................................................................................................................................................................
TEMPERATURE
RESISTANCE (OHMS)
°C
°F
MIN
MAX
...............................................................................................................................................................................................................................................
-40
-4O
291,490
381,710
-20
-4
85,850
108,390
-10
14
49,250
61,430
0
32
29,330
35,990
10
50
17,990
21,810
20
68
11,370
13,610
25
77
9,120
10,880
30
86
7,370
8,750
40
104
4,900
5,750
50
122
3,330
3,880
60
14O
2,310
2,670
