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 will cause driveability problems.

NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in testing procedures.

COOLANT TEMPERATURE RESISTANCE VALUES ⁽¹⁾

Temperature - °F (°C)

Ohms

212 (100)

177

158 (70)

467

100 (38)

1800

68 (20)

3520

23 (-5)

12,300

0 (-18)

25,000

-40 (-40)

100,700

⁽¹⁾	Measure resistance across sensor terminals.

MANIFOLD AIR TEMPERATURE (MAT) SENSOR RESISTANCE VALUES ⁽¹⁾

Temperature - °F (°C)

Ohms

210 (100)

185

160 (70)

450

100 (38)

1800

70 (20)

3400

40 (4)

7500

20 (-7)

13,500

0 (-18)

25,000

-40 (-40)

100,700

⁽¹⁾	Measure resistance across sensor terminals.

MAP SENSOR VOLTAGE RANGE ⁽¹⁾

Altitude (Ft.)

Volts

Below 1000

3.8-5.5

1000-2000

3.6-5.3

2000-3000

3.5-5.1

3000-4000

3.3-5.0

4000-5000

3.2-4.8

5000-6000

3.0-4.6

6000-7000

2.9-4.5

7000-8000

2.8-4.3

8000-9000

2.6-4.2

9000-10,000

2.5-4.0

⁽¹⁾	Measured at sensor, or as seen on Scan tester.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Rich

⁽¹⁾	Measure voltage between O2 sensor ground and signal terminals at ECM.