Engine Coolant Temperature Sending Unit

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Connect wiring harness as shown in Fig 1. Adjust ammeter pointer to zero using slide rheostat, then read rheostat indicator. Compare resistance value to specifications. See ENGINE COOLANT TEMPERATURE SENDING UNIT RESISTANCE table.

Fig 1: Testing Engine Coolant Temperature Sending Unit

ENGINE COOLANT TEMPERATURE SENDING UNIT RESISTANCE

Engine Coolant Temp. °F (°C)	Ohms
122 (50)	160-240
248 (120)	17.1-21.2