Water Temperature Sensor Terminal Identification


Thermo Water Sensor

Analog signal representing engine coolant temperature


Earth Ground

Sensor ground return path

The sensor and ECU are wired as shown in the diagram. Signal voltage characteristics are determined by the value of the pull-up resistor, located inside the ECU, either 2.7 KW or 5 M. The graphs accompanying the diagram give approximate voltage specifications. To determine which pull-up resistor a particular ECU uses, refer to the technical reference charts in Appendix B of this book.

Toyota Temp Sensor Plot
Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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