Engine Controls - Sensor Operating Range Charts: Introduction

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 with a Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance.

CRANKSHAFT POSITION SENSOR RESISTANCE

Temperature - °F (°C)

Ohms

68 (20)

⁽¹⁾ 770-950

⁽¹⁾	Measure resistance between crankshaft position sensor terminals No. 1 and No. 2. See Fig 1 .

Fig 1: Crankshaft Position Sensor, Heated Oxygen Sensor & Mass Air Flow Sensor Connector View

Courtesy of SAAB-SCANIA OF AMERICA, INC.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Volts

Ohms

-22 (-30)

4.8

20,000-30,000

-14 (-10)

4.5

7000-11,400

68 (20)

3.6

2100-2900

104 (40)

2.7

1000-1300

140 (60)

1.9

565-670

176 (80)

1.2

295-365

194 (90)

1.0

240-260

230 (110)

0.65

140-160

⁽¹⁾	Measure resistance and voltage between sensor terminals.

HEATED OXYGEN SENSOR (HO2S) VOLTAGE ⁽¹⁾

Condition

Volts

Lean

.1-0.4

Rich

0.6-0.9

⁽¹⁾	Measure voltage between terminals No. 3 and No. 4. Terminals No. 3 and No. 4 are Gold-plated. See Fig 1 .

HEATED OXYGEN SENSOR (HO2S) HEATER RESISTANCE

Backprobe Between Terminals No.

Ohms

1-2

⁽¹⁾ 9

⁽¹⁾	Measure resistance at 68°F (20°C). See Fig 1 .

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Volts

Ohms

-22 (-30)

4.5

20,000-30,000

14 (-10)

3.9

7000-11,400

68 (20)

2.4

2100-2900

104 (40)

1.5

1000-1300

140 (60)

0.9

565-670

176 (80)

0.5

295-365

194 (90)

0.4

240-260

⁽¹⁾	On 9-3 and 9-5 (2.3L) models, measure resistance/voltage between intake air temperature sensor terminals "A" and "B". See Fig 3 . On 9-5 (3.0L) models, measure resistance/voltage at between intake air temperature sensor terminals "B" and "D". See Fig 3 .

MASS AIR FLOW FREQUENCY ⁽¹⁾

Air Flow (Grams/Second)

Frequency (Hertz)

100-300

1045

1.5

1312

1527

3.5

2012

2355

7.5

2788

3134

3678

4095

4764

5289

5730

6114

6753

100

7286

120

7743

140

8158

⁽¹⁾	Measure frequency at mass air flow sensor terminal No. 1. See Fig 1 .

MANIFOLD ABSOLUTE PRESSURE/CHARGE AIR PRESSURE SENSOR VOLTAGES ⁽¹⁾⁽²⁾

Vacuum/Pressure

Volts

In. Hg

7.4

0.9

14.8

1.3

29.53

2.1

psi

18.1

2.5

21.8

2.9

25.4

3.3

⁽¹⁾	On 9-3 models, measure voltage between manifold absolute pressure sensor terminals "A" and "D". See Fig 2 . On 9-5 models, measure voltage between manifold absolute pressure sensor terminals "A" and "B". See Fig 2 .

⁽²⁾	Measure voltage between charge air pressure sensor terminals "A" and "C". See Fig 3 .

Fig 2: Manifold Absolute Pressure Sensor Connector View

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 3: Charge Air Pressure/Intake Air Temperature Sensor Connector View

Courtesy of SAAB-SCANIA OF AMERICA, INC.

THROTTLE/PEDAL POSITION SENSOR VOLTAGES

Sensor - Throttle/Pedal Position

Backprobe Between Terminals No. ⁽¹⁾

Voltage

Throttle Position Sensor 1

Closed

6-9

0.065-1.090

Open

6-9

3.930-4.775

Throttle Position Sensor 2

Closed

8-9

3.910-4.935

Open

8-9

0.025-1.070

Pedal Position Sensor 1

Released

1-9

3.990-4.645

Depressed

1-9

0.400-1.055

Pedal Position Sensor 2

Released

3-9

0.355-1.010

Depressed

3-9

3.945-4.600

⁽¹⁾	See Fig 4 or Fig 5

Fig 4: Electronic Throttle Actuator Connector View (9-3 & 9-5 - 2.3L)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 5: Electronic Throttle Actuator Connector View (9-5 - 3.0L)

Courtesy of SAAB-SCANIA OF AMERICA, INC.