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Engine Coolant Temperature Sending Unit

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
G00024194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
ENGINE COOLANT TEMPERATURE SENDING UNIT RESISTANCE

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