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ECA 4 - Code 09 (Coolant Temperature Sensor)
- Check for loose connectors, corrosion or damage at coolant temperature sensor and ECA terminal 2I. Repair as necessary.
- Check resistance across temperature sensor terminals. Resistance should be as shown in COOLANT TEMPERATURE SENSOR RESISTANCE
table. If resistance is incorrect, replace temperature sensor.
COOLANT TEMPERATURE SENSOR RESISTANCE
| Coolant Temperature |
Ohms |
| -4°F (-20°C) |
14,600-17,800 |
| 68°F (20°C) |
2210-2690 |
| 176°F (80°C) |
290-354 |
- If resistance is within specification, turn ignition on and check for voltage at ECA terminal 2I. If voltage reading is 5 volts, check for open in wire between temperature sensor Brown/Red terminal and ECA terminal 2I. Repair as necessary.
- If voltage reading is 0-2.5 volts, check for short in wire between temperature sensor Brown/Red terminal and ECA terminal 2I. Repair as necessary.
- If no short is indicated, go to ECA 8
. If symptom persists, go to ECA 55
.