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.

COOLANT TEMPERATURE SENSOR RESISTANCE ⁽¹⁾

Temperature °F (°C)

Ohms

212 (100)

177

194 (90)

241

176 (80)

332

158 (70)

467

140 (60

667

122 (50)

973

113 (45)

1188

104 (40)

1459

95 (35)

1802

86 (30)

2238

77 (25)

2796

68 (20)

3520

59 (15)

4450

50 (10)

5670

41 (5)

7280

32 (0)

9420

23 (-5)

12,300

14 (-10)

16,180

5 (-15)

21,450

-4 (-20)

28,680

-22 (-30)

52,700

-40 (-40)

100,700

⁽¹⁾	Measure resistance between terminals of sensor.

FUEL INJECTOR SOLENOID RESISTANCE

Test Point	Ohms
Between Injector Terminals	Greater Than 1.2

IDLE AIR CONTROL VALVE (IACV) RESISTANCE

Wire Color (Connector Terminal)	Ohms
Green/White (A) & Green/Black (B)	40-80
Blue/White (C) & Blue/Black (D)	40-80

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR VOLTAGE⁽¹⁾

Altitude Feet (Meters)

Volts

1000-2000 (305-610)

3.6-5.2

2000-3000 (610-914)

3.5-5.1

3000-4000 (914-1219)

3.3-5.0

4000-5000 (1219-1524)

3.2-4.8

5000-6000 (1524-1829)

3.0-4.6

6000-7000 (1829-2133)

2.9-4.5

7000-8000 (2133-2438)

2.8-4.3

8000-9000 (2438-2743)

2.6-4.2

9000-10,000 (2743-3048)

2.5-4.0

⁽¹⁾	Measure voltage at circuit No. 432 (White/Green wire) and circuit No. 450 (Black/White wire) with ignition on and engine off.

O2 SENSOR VOLTAGE⁽¹⁾

Condition

Volts

Lean

0.1

Rich

0.9

⁽¹⁾	Measure voltage between ground and O2 sensor terminal with engine running.

THROTTLE POSITION SENSOR (TPS) VOLTAGE⁽¹⁾

Application

Volts

Closed Throttle

.4-1.25

Full Throttle

4.8

⁽¹⁾	Measure voltage at circuit No. 417 (Blue wire), with circuit No. 452 (Black wire) grounded and a 5-volt reference supplied to circuit No. 416 (Gray wire).

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