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Coolant Temperature Sensor Testing
02-20-2014, 11:24 AM
#1
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Join Date: May 2009
Location: Northern Illinois
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Year: 1997
Model: Cherokee
Engine: 4.0L
Coolant Temperature Sensor Testing
Since my XJ has over 140K I thought I would replace my coolant temp sensor and in the process do a head to head test with a NAPA Echlin premium sensor. I'd like some input regarding the numbers. The Jeep runs fine, except for crappy gas mileage. I haven't driven it yet because my steep driveway has about a 1/2" of ice on it.
I took out the original coolant temp sensor and replaced it with a NAPA premium Echlin TS3005.
Tested in the garage with a 43 degree ambient temperature.
Original: 23.56 k/ohms (cold) to 5.45 k/ohms. Maxed out after several minutes under the heat of a small light.
NAPA: 22.97 k/ohms (cold) to 2.29 k/ohms. Maxed out same as above.
The original sensor appeared to react quicker than the NAPA. I will see how the Jeep responds to the NAPA sensor.
Thanks for any input.
I took out the original coolant temp sensor and replaced it with a NAPA premium Echlin TS3005.
Tested in the garage with a 43 degree ambient temperature.
Original: 23.56 k/ohms (cold) to 5.45 k/ohms. Maxed out after several minutes under the heat of a small light.
NAPA: 22.97 k/ohms (cold) to 2.29 k/ohms. Maxed out same as above.
The original sensor appeared to react quicker than the NAPA. I will see how the Jeep responds to the NAPA sensor.
Thanks for any input.
02-23-2014, 10:53 AM
#2
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Join Date: May 2009
Location: Northern Illinois
Posts: 247
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Received 2 Likes
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Year: 1997
Model: Cherokee
Engine: 4.0L
Since my XJ has over 140K I thought I would replace my coolant temp sensor and in the process do a head to head test with a NAPA Echlin premium sensor. I'd like some input regarding the numbers. The Jeep runs fine, except for crappy gas mileage. I haven't driven it yet because my steep driveway has about a 1/2" of ice on it.
I took out the original coolant temp sensor and replaced it with a NAPA premium Echlin TS3005.
Tested in the garage with a 43 degree ambient temperature.
Original: 23.56 k/ohms (cold) to 5.45 k/ohms. Maxed out after several minutes under the heat of a small light.
NAPA: 22.97 k/ohms (cold) to 2.29 k/ohms. Maxed out same as above.
The original sensor appeared to react quicker than the NAPA. I will see how the Jeep responds to the NAPA sensor.
Thanks for any input.
I took out the original coolant temp sensor and replaced it with a NAPA premium Echlin TS3005.
Tested in the garage with a 43 degree ambient temperature.
Original: 23.56 k/ohms (cold) to 5.45 k/ohms. Maxed out after several minutes under the heat of a small light.
NAPA: 22.97 k/ohms (cold) to 2.29 k/ohms. Maxed out same as above.
The original sensor appeared to react quicker than the NAPA. I will see how the Jeep responds to the NAPA sensor.
Thanks for any input.
29,330-35,990 ohms@32F
640-720 ohms@212F
02-23-2014, 03:26 PM
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Year: 1999
Model: Cherokee
Engine: 4.0
This is all I could find.
1993 XJ FSM
COOLANT TEMP SENSOR & MANIFOLD AIR TEMP SENSOR RESISTANCE TABLE
Temperature *F(*C) Minimum Ohms Maximum Ohms
-40 (-40) .............. 291,490 .......... 381,710
-4 (-20) ............... 85,850 ........... 108,390
14 (-10) ............... 49,250 ............ 61,430
32 (0) ................. 29,330 ............ 35,990
50 (10) ................ 17,990 ............ 21,810
68 (20) ................ 11,370 ............ 13,610
77 (25) ................. 9120 ............. 10,880
86 (30) ................. 7370 ............... 8750
104 (40) ................ 4900 ............... 5750
122 (50) ................ 3330 ............... 3880
140 (60) ................ 2310 ............... 2670
158 (70) ................ 1630 ............... 1870
176 (80) ................ 1170 ............... 1340
194 (90) ................. 860 ................ 970
212 (100) ................ 640 ................ 720
230 (110) ................ 480 ................ 540
248 (120) ................ 370 ................ 410
1988 FSM
1993 XJ FSM
COOLANT TEMP SENSOR & MANIFOLD AIR TEMP SENSOR RESISTANCE TABLE
Temperature *F(*C) Minimum Ohms Maximum Ohms
-40 (-40) .............. 291,490 .......... 381,710
-4 (-20) ............... 85,850 ........... 108,390
14 (-10) ............... 49,250 ............ 61,430
32 (0) ................. 29,330 ............ 35,990
50 (10) ................ 17,990 ............ 21,810
68 (20) ................ 11,370 ............ 13,610
77 (25) ................. 9120 ............. 10,880
86 (30) ................. 7370 ............... 8750
104 (40) ................ 4900 ............... 5750
122 (50) ................ 3330 ............... 3880
140 (60) ................ 2310 ............... 2670
158 (70) ................ 1630 ............... 1870
176 (80) ................ 1170 ............... 1340
194 (90) ................. 860 ................ 970
212 (100) ................ 640 ................ 720
230 (110) ................ 480 ................ 540
248 (120) ................ 370 ................ 410
1988 FSM
CTS & MAT SENSOR TEMPERATURE-TO-RESISTANCE VALUE
*F (*C) Ohms
212 (100) .................................. 185
160 (71) ................................... 450
100 (38) .................................. 1600
70 (21) ................................... 3400
40 (4) .................................... 7500
20 (-7) ................................. 13,500
0 (-18) ................................. 25,000
-40 (-40) .............................. 100,700
160 (71) ................................... 450
100 (38) .................................. 1600
70 (21) ................................... 3400
40 (4) .................................... 7500
20 (-7) ................................. 13,500
0 (-18) ................................. 25,000
-40 (-40) .............................. 100,700
Last edited by CCKen; 02-23-2014 at 03:34 PM.
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