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 .