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Engine Controls - Sensor Operating Range Charts: Introduction

Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems. For further information on sensor testing, see TESTS W/CODES articles below:

NOTE: For sensor voltage readings, refer to PIN VOLTAGE CHARTS article.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (1)

Temperature °F (°C) Ohms
-4 (-20) 15,000-18,000
32 (0) 4500-7500
68 (20) 2500-3500
104 (40) 900-1800
176 (80) 400-600
212 (100) 250-350
(1) Measure resistance across sensor terminals.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (1)

Temperature °F (°C) Ohms
-4 (-20) 15,000-18,000
32 (0) 4500-7500
68 (20) 2500-3500
104 (40) 900-1800
176 (80) 400-600
212 (100) 250-350
(1) Measure resistance across sensor terminals.