D 150 Pickup V6-239 3.9L (1992)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
NOTE:
To perform a complete test of Coolant Temperature sensor and its circuitry, refer to appropriate Diagnostics Chart. To test the sensor only, refer to
the following:
1.
Disconnect wire harness 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.
2.
Test the resistance of the sensor with a high input impedance (digital) volt-ohmmeter. The resistance (as measured across the sensor terminals)
should be less than 1000 ohms with the engine warm. Refer to the Coolant Temperature sensor/Charge Air Temperature sensor resistance chart.
Replace the sensor if it is not within the range of resistance specified in the chart.
3.
Test continuity of the wire harness. Do this between the Engine Controller wire harness connector terminal 2 and the sensor connector terminal.
Also test continuity of wire harness terminal 4 to the sensor connector terminal. Repair the wire harness if an open circuit is indicated.
4.
After tests are completed, connect electrical connector to sensor. The sensor connector is symmetrical (not indexed). It can be installed to the
sensor in either direction.
...............................................................................................................................................................................................................................................
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
70
158
1,630
1,870
80
176
1,170
1,340
90
194
860
970
100
212
640
720
110
230
480
540
120
248
370
410
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