Pinpoint Test K: Engine Coolant Temperature (ECT) Sensor: Introduction
NOTE:
Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.
This pinpoint test is intended to diagnose the following:
- ECT sensor (12A648)
- secondary cooling system engine coolant temperature 2 (ECT2) sensor (12A648)
- harness circuits: ECT, ECT2 and SIGRTN
- PCM (12A650)
TEMPERATURE AND RESISTANCE VALUES SPECIFICATIONS (APPROXIMATE)
| °C |
°F |
Ohms |
| 100 |
212 |
2, 080 |
| 90 |
194 |
2, 803 |
| 80 |
176 |
3, 836 |
| 70 |
158 |
5, 337 |
| 60 |
140 |
7, 556 |
| 50 |
122 |
10, 908 |
| 45 |
113 |
13, 216 |
| 40 |
104 |
16, 092 |
| 35 |
95 |
19, 696 |
| 30 |
86 |
24, 329 |
| 25 |
77 |
30, 000 |
| 20 |
68 |
37, 352 |
| 15 |
59 |
46, 797 |
| 10 |
50 |
59, 016 |
| 5 |
41 |
74, 940 |
| 0 |
32 |
95, 851 |
| -5 |
23 |
123, 485 |
| -10 |
14 |
160, 313 |
| -15 |
5 |
209, 816 |
| -20 |
-4 |
276, 959 |
| -30 |
-22 |
496, 051 |
| -40 |
-40 |
925, 021 |
Courtesy of FORD MOTOR CO.
| Pin |
Circuit |
| 2 |
SIGRTN (Signal Return) |
| 1 |
ECT (Engine Coolant Temperature) |
Courtesy of FORD MOTOR CO.
| Pin |
Circuit |
| 2 |
SIGRTN (Signal Return) |
| 1 |
ECT2 (Engine Coolant Temperature 2) |
Courtesy of FORD MOTOR CO.
| Pin |
Circuit |
| 4 |
SIGRTN (Signal Return) |
| 31 |
ECT2 (Engine Coolant Temperature 2) |
| 28 |
ECT (Engine Coolant Temperature) |