Fault Detection/Management
The ECT sensor is located on the left side of the front engine cover. The PCM supplies a 5-volt reference signal that the ECT sensor uses to produce an analog voltage, indicating the temperature. The PCM continuously monitors the signal of the ECT sensor to determine if the signal is within an expected range. If the PCM detects an out of range high or low, the PCM ignores the ECT signal and substitutes the EOT signal. If both the ECT and EOT signals are out of range, the PCM assumes an engine coolant temperature of -34°C (-29°F) for starting and 82°C (180°F) for engine running conditions.
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 the 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 |