Coolant Temperature Sensor

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Disconnect plug J1 from ECA. Connect an ohmmeter between pin 7 and ground. Resistance should be greater than 10,000 ohms. If resistance is less than 10,000 ohms, check wiring harness for a short to ground. Connect an ohmmeter to pins 7 and 12 of connector. Resistance should be as specified in Coolant Temperature Sensor Resistance table. If not, check wiring harness for open circuits or replace sensor.

COOLANT TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C)	Resistance (Ohms)
0 (4)	155,000
60 (16)	95,000
200 (93)	2350
240 (116)	1300