Pinpoint Test L: Engine Oil Temperature (EOT) Sensor: Introduction: Detection/Management
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2005 Ford RV Cutaway, 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
An EOT sensor signal that is detected out of range (high or low) by the PCM causes the PCM to ignore the EOT sensor signal and assume an engine oil temperature of -20°C (-4°F) for starting and a temperature of 100°C (212°F) for engine-running conditions. The CHECK ENGINE lamp remains illuminated as long as the fault condition exists.
CAUTION:
The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause an improper connection, misdiagnosis, and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.
NOTE:
Visually inspect the harness connectors for corrosion, damage, proper mating, and correct pin tension.
TEMPERATURE VS. RESISTANCE VALUES (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 | 79,940 |
| 0 | 32 | 95,851 |
| -5 | 23 | 124,485 |
| -10 | 14 | 160,313 |
| -15 | 5 | 209,816 |
| -20 | -4 | 276,959 |
| -30 | -22 | 496,051 |
| -40 | -40 | 925,021 |