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Coolant Temperature Sensor

Remove CU connector plug. On 944-S models, connect ohmmeter between CU terminal No. 45 and ground. On all other models, connect ohmmeter between CU terminal No. 13 and ground. Compare ohmmeter readings to COOLANT TEMPERATURE SENSOR RESISTANCE  table.

COOLANT TEMPERATURE SENSOR RESISTANCE

Temperature Ohms +/-10%
50°F (10°C) 3300-4100
68°F (20°C) 2200-2800
104°F (40°C) 1000-1300
176°F (80°C) 290-350
212°F (100°C) 160-210