Coolant Temperature Sensor

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.