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.

BAROMETRIC PRESSURE SENSOR OUTPUT VOLTAGE ⁽¹⁾

Vacuum - In. Hg.

⁽²⁾ Volts

3.84

3.36

2.66

1.93

1.26

0.58

⁽¹⁾	Measure voltage between breakout box test pins BP and SIGRTN.

⁽²⁾	Voltage may differ by plus or minus 15 percent.

ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Ohms

-4 (-20)

14,600-17,800

68 (20)

2200-2700

176 (80)

290-350

⁽¹⁾	Measure resistance between breakout box test pins ECT and SIGRTN.

IGNITION DIAGNOSTIC MONITOR VOLTAGE ⁽¹⁾

RPM

Volts

500

1.103

1000

1.257

1500

1.542

2000

1.768

2500

2.06

3000

2.15

3500

2.26

4000

2.50

4500

2.47

5000

2.40

⁽¹⁾	Measure voltage between breakout box test pins IDM and VPWR.

TP SENSOR OUTPUT VOLTAGE

Throttle Opening

⁽¹⁾ Voltage

1/8

1.00

1/4

1.60

3/8

2.37

1/2

2.74

5/8

3.15

3/4

3.43

7/8

3.60

Full Open

4.02

⁽¹⁾	Voltage may differ by 15 percent.

VOLUME AIRFLOW METER VOLTAGE ⁽¹⁾

Door Opening

⁽²⁾ Volts

1/8

3.24

1/4

5.60

3/8

5.62

1/2

5.83

5/8

6.02

3/4

6.57

7/8

7.46

Fully Open

7.87

⁽¹⁾	Measure voltage between breakout box test pins VAF and SIGRTN.

⁽²⁾	Voltage may differ by plus or minus 15 percent.

IAT SENSOR RESISTANCE ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Ohms

-4 (-20)

10,000-20,000

32 (0)

4000-7000

68 (20)

2000-3000

104 (40)

900-1300

140 (60)

400-700

⁽¹⁾	Measure resistance between breakout box test pins IAT and SIGRTN.

⁽²⁾	Resistance may differ by plus or minus 15 percent.

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

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