Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSAAB19919000 CD, 2.3 M, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESENSOR RANGE CHARTSENGINE CONTROLS - SENSOR OPERATING RANGE CHARTSINTRODUCTION

1991 Saab 9000 CD, 2.3 M, Standard

Engine Controls - Sensor Operating Range Charts: Introduction

1991 Saab 9000 CD, 2.3 M, StandardSECTION 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: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.

COOLANT TEMP SENSOR RESISTANCE TEST ⁽¹⁾

Temperature °F (°C)

Ohms

32 (0)

5800

50 (10)

3800

59 (15)

3000

68 (20)

2600

77 (25)

2000

86 (30)

1700

176 (80)

320

⁽¹⁾	Measure resistance across sensor terminals.

OXYGEN SENSOR VOLTAGE TEST

Condition

⁽¹⁾ Volts

Lean

0-.4

Rich

.6-1.0

⁽¹⁾	With engine running, measure voltage between pin No. 24 of fuel injection ECU and ground.

TPS SENSOR RESISTANCE TEST ⁽¹⁾

Position

Ohms

Fully Closed

2600-3000

Fully Open

1100-1500

⁽¹⁾	Measure resistance between terminals No. 1 and 3.

VEHICLE SPEED SENSOR VOLTAGE TEST ⁽¹⁾

Application

Volts

900 Series

⁽²⁾ 0.5-5

9000 Series

⁽³⁾ 0-5

⁽¹⁾	Measure voltage between fuel injection ECU terminal No. 34 and ground.

⁽²⁾	With one front wheel rotating.

⁽³⁾	Rotate front wheels with engine. Voltage should increase with increasing wheel RPM.

RENDER: 1.0x

NO RELATED

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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.