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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 with a Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (900 SERIES) (1)

Temperature - °F (°C) Ohms
-22 (-30) 20,000-30,000
68 (20) 8300-10,600
104 (40) 2300-2700
140 (60) 565-670
176 (80) 295-365
194 (90) 200-240
230 (110) 140-160
(1)
Measure resistance between sensor terminals.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (9000 SERIES EXCEPT TURBO) (1)

Temperature - °F (°C) Ohms
32 ( 0) 5800
50 (10) 3800
59 (15) 3000
68 (20) 2600
77 (25) 2000
86 (30) 1700
176 (80) 320
(1)
Measure resistance between sensor terminals.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (9000 SERIES TURBO) (1)

Temperature - °F (°C) Ohms
-22 (-30) 20,000-30,000
14 (-10) 8300-10,600
68 (20) 2300-2700
104 (40) 1000-1300
140 (60) 560-670
176 (80) 300-360
(1)
Measure resistance between sensor terminals.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (900 SERIES EXCEPT TRIONIC) (1)

Temperature - °F (°C) Ohms
4 (-20) 15,000
32 (0) 5800
68 (20) 2600
86 (30) 1700
176 (80) 320
(1)
Measure resistance between sensor terminals.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (900 SERIES TRIONIC) (1)

Temperature - °F (°C) Ohms
-22 (-30) 20,000-30,000
14 (-10) 7000-11,400
68 (20) 2100-2900
104 (40) 1000-1300
140 (60) 565-670
176 (80) 295-365
194 (90) 240-260
(1)
Measure voltage between sensor terminals.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (9000 SERIES TURBO) (1)

Temperature - °F (°C) Ohms
-22 (-30) 20,000-30,000
14 (-10) 8300-10,600
68 (20) 2300-2700
104 (40) 1000-1300
140 (60) 560-670
176 (80) 300-360
(1)
Measure resistance between sensor terminals.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR VOLTAGE (900 SERIES TRIONIC & 9000 SERIES) (1)

Pressure - In. Hg Volts
-22.5 0.5
-15.0 0.9
0 1.8
7.5 2.3
15.0 2.8
22.5 3.3
(1)
Measure voltage between terminals No. 1 and No. 2.
OXYGEN SENSOR VOLTAGE

Condition Volts
Lean 0-0.4
Rich 0.6-1.0
THROTTLE POSITION SENSOR (TPS) RESISTANCE (900 SERIES EXCEPT TRIONIC)

Position Ohms
Idle Position (1) 2300-3400
Wide Open Throttle (1) 700-1000
(1)
Dial resistance between terminals No. 1 and 3.
THROTTLE POSITION SENSOR (TPS) RESISTANCE (900 SERIES TRIONIC)

Position Ohms
Total Resistance (1) 1600-2400
Idle Position (2) 800-1200
Wide Open Throttle (2) 2000-3000
(1)
Measure resistance between terminals No. 1 and 2.
(2)
Measure resistance between terminals No. 2 and 3.
THROTTLE POSITION SENSOR (TPS) RESISTANCE (9000 SERIES EXCEPT TURBO) (1)

Position Ohms
Fully Closed 2600-3000
Fully Open 1100-1500
(1)
Measure resistance between terminals No. 1 and 3.
THROTTLE POSITION SENSOR (TPS) RESISTANCE (9000 SERIES TURBO) (1)

Position Ohms
Fully Closed 2500
Fully Open 1000
(1)
Measure resistance between terminals No. 1 and 3.
VEHICLE SPEED SENSOR (VSS) VOLTAGE (1)

Application Volts
9000 Series About 0.6
(1)
Rotate front wheels with engine. Voltage should increase with increasing wheel RPM.
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