Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Tests DX: Engine Coolant Temperature (ECT) Sensor: Introduction
This pinpoint test is intended to diagnose the following:
- ECT sensor (12A648)
- harness circuits: ECT and SIGRTN
- powertrain control module (PCM) (12A650)
Voltage values calculated for VREF equals 5 volts. These values may vary by 15% due to sensor and VREF variations.
| Temperature | Temperature Sensor Values | |
|---|---|---|
| °C | °F | Resistance (K ohms) |
| 120 | 248 | 1.18 |
| 110 | 230 | 1.55 |
| 100 | 212 | 2.07 |
| 90 | 194 | 2.80 |
| 80 | 176 | 3.84 |
| 70 | 158 | 5.37 |
| 60 | 140 | 7.70 |
| 50 | 122 | 10.97 |
| 40 | 104 | 16.15 |
| 30 | 86 | 24.27 |
| 20 | 68 | 37.30 |
| 10 | 50 | 58.75 |
| 0 | 32 | 95.85 |
| -10 | 14 | 160.31 |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| EcoSport, Mustang, Ranger, Transit Connect 2.0L | A | 2 1 |
SIGRTN ECT |
| All other vehicles | B | 2 1 |
SIGRTN ECT |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to Reference Values.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Aviator, Explorer 3.0L, Explorer 3.3L | 306 PIN | E13 E29 |
SIGRTN ECT |
| Continental, EcoSport 2.0L | 198 PIN | E20 E46 |
SIGRTN ECT |
| EcoSport 1.0L Automatic Transmission | 198 PIN | E20 E35 |
SIGRTN ECT |
| EcoSport 1.0L Manual Transmission | 198 PIN | E10 E23 |
SIGRTN ECT |
| EcoSport 1.5L Automatic Transmission, KA 1.5L Automatic Transmission | 198 PIN | E12 E33 |
SIGRTN ECT |
| EcoSport 1.5L Manual Transmission, KA 1.2L | 112 PIN | E3 E23 |
SIGRTN ECT |
| Edge 2.0L, Nautilus 2.0L | 198 PIN | E20 E38 |
SIGRTN ECT |
| Edge 2.7L, Nautilus 2.7L | 306 PIN | E20 E29 |
SIGRTN ECT |
| F-150 | 306 PIN | E39 E71 |
SIGRTN ECT |
| KA 1.0L | 128 PIN | E15 E27 |
SIGRTN ECT |
| KA 1.5L Manual Transmission | 112 PIN | E23 E23 |
SIGRTN ECT |
| Ranger 2.5L | 128 PIN | E3 E31 |
SIGRTN ECT |
| Transit Connect 2.0L | 198 PIN | E13 | SIGRTN |
| All other vehicles | 198 PIN | E13 E38 |
SIGRTN ECT |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.