Section 140 (Engine Controls - Sensor Operating Range Charts.): Introduction

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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.

ENGINE COOLANT TEMPERATURE RESISTANCE VALUES ⁽¹⁾

°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.

DIESEL FUEL TEMPERATURE RESISTANCE VALUES ⁽¹⁾

°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.

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE VALUES ⁽¹⁾

°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⁾

Throttle Position

Volts

At Idle

1.0-2.0

Wide Open Throttle

4.0-4.8

⁽¹⁾	Measured at sensor, or as seen on scan tester. Ensure sensor output changes instantly when intake manifold vacuum is applied and released.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Rich

⁽¹⁾	Measure voltage between oxygen sensor ground and signal terminals at PCM.