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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.

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
COLD START THERMOSWITCH RESISTANCE

Temperature Ohms
68°F (20°C) 25-35
176°F (80°C) 64-76
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature Ohms
-4°F (-20°C) 14,600-17,800
68°F (20°C) 2200-2700
104°F (40°C) 1000-1300
140°F (60°C) 500-650
176°F (80°C) 290-350
EGR POSITION SENSOR RESISTANCE

Terminals (1) Ohms With No Vacuum Applied Ohms @ 5.9 In. Hg
"A" & "B" 2700 2700
"A" & "C" 500 2700
"B" & "C" 2400 100
(1) See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE

Application Ohms
929
77°F (25°C) 29,700-36,300
185°F (85°C) 3300-3700
OXYGEN SENSOR

Operating Condition Volts
Rapidly Accelerating 0.5-1.0
Deceleration 0.0-0.4
THROTTLE POSITION SENSOR CONTINUITY

Condition (1) Continuity Between Terminals "C" & "D"
.004" (.10 mm) Yes
.012" (.30 mm) No
(1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.
THROTTLE POSITION SENSOR VOLTAGE

Wire Color To Ground Closed Throttle Volts WOT Volts
Blue (2F) (1) 0.1-1.1 2.8-4.5
(1) ECM/PCM terminal pin No. in parentheses.
THROTTLE POSITION (TP) SENSOR RESISTANCE

Application Ohms
Between Terminals "A" & "D" (1) 3000-6000
Between Terminals "B" & "D" (1)
Closed Throttle 200-600
Wide Open Throttle 3300-7000
(1) See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.