Section 30 (Engine Controls - Sensor Operating Range Charts): Introduction

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 1994 Pontiac Trans Sport, 1994 Oldsmobile Silhouette, 1994 Oldsmobile Bravada, 1994 GMC Yukon, and 1994 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.

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⁾

°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.

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 ECM.