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.

AIRFLOW SENSOR VOLTAGES

Terminal ⁽¹⁾

Ignition On Volts

Engine Running Volts

"A" (Power Supply)

12.0

"B" (Airflow Signal

0.5-1.0

1.0-2.0

"D" (Ground)

"E" (Ground)

⁽¹⁾	See appropriate SYSTEM/COMPONENT TESTS article for terminal identification.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature	Ohms
50°F (10°C)	58,750
68°F (20°C)	37,300
176°F (80°C)	384
194°F (90°C)	280

EGR POSITION SENSOR RESISTANCE

Terminals ⁽¹⁾

Ohms With No Vacuum Applied

Ohms @ 5.9 in. Hg

"A" & "B"

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

Temperature	Ohms
50°F (10°C)	58,750
68°F (20°C)	37,300
176°F (80°C)	384
194°F (90°C)	280

OXYGEN SENSOR

Operating Condition	Volts
Rapidly Accelerating	0.5-1.0
Deceleration	0.0-0.4

THROTTLE POSITION SENSOR VOLTAGE

Application

⁽¹⁾ Volts

Closed Throttle

.60

Wide Open Throttle

4.50

⁽¹⁾	Check voltage with voltmeter connected between breakout box pins No. 46 and 47.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Engine Controls - Sensor Operating Range Charts: Introduction

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?