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 MANUALSSAAB1991900 BASE, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESFAULT CODES (USING ISAT SCAN TESTER)
1991 Saab 900 Base, 2D Convertible, Standard
Fault Codes (Using ISAT Scan Tester)
1991 Saab 900 Base, 2D Convertible, StandardSECTION Fault Codes (Using ISAT Scan Tester)
Connect ISAT Scan Tester (available from manufacturer) according to manufacturer's instructions. Diagnostic connector is under right front seat, protected by a plastic cover. Follow instructions furnished with tester to retrieve codes.
TROUBLE CODE DEFINITION MENU (USING ISAT SCAN TESTER)
| Permanent Fault | Intermittent Fault | Malfunction Indicated | ||
|---|---|---|---|---|
| 42241 | 22241 | Voltage Higher Than 16 Volts | ||
| 42251 | 22251 | Less Than One Volt At ECU Pin No. 4 | ||
| 42252 | 22252 | Signal Voltage Less Than 10 Volts | ||
| 42291 | 22291 | Battery Voltage Less Than 10 Volts Or Higher Than 16 Volts | ||
| 42440 | 22440 | Rich Mixture: No Control By O2 Sensor | ||
| 42441 | 22441 | Rich Idle Mixture | ||
| 42442 | 22442 | Rich Mixture | ||
| 42450 | 24250 | Lean Mixture: No Control By O2 Sensor | ||
| 42451 | 22451 | Lean Idle Mixture | ||
| 42452 | 22452 | Lean Mixture | ||
| 42460 (1) | 22460 (1) | O2 Sensor Signal Faulty | ||
| 42491 | 22491 | Incorrect Idle Mixture | ||
| 42492 | 22492 | Incorrect Mixture | ||
| 44221 | 24221 | Vehicle Speed Sensor Signal Absent | ||
| 44261 | 24621 | Vehicle Speed Sensor Signal Faulty | ||
| 44360 | 24360 | Crankshaft Sensor Signal Faulty | ||
| 44460 (1) | 24460 | Load Signal Faulty | ||
| 44461 | 24461 | ECU Programming Fault: Outside Limits | ||
| 44660 | 24660 | Pre-Ignition Fault | ||
| 44661 | 24661 | Knock Sensor Signal Faulty | ||
| 44671 | 24671 | Pre-Ig. Signal Longer Than 20 Seconds | ||
| 44662 | 24462 | Pre-Ign. Synchronization Signal Faulty | ||
| 45260 | 25260 | Throttle Potentiometer Signal Faulty | ||
| 45360 | 25360 | Brake Signal Faulty | ||
| 45641 (1) | 25641 (1) | Mass Airflow Meter Signal High | ||
| 45651 (1) | 25651 (1) | Mass Airflow Meter Signal Low | ||
| 45691 (1) | 25691 (1) | Mass Airflow Meter Signal Faulty | ||
| 45723 | 25723 | Transmission Range Signal/Function Faulty | ||
| 45771 (1) | 25771 | Throttle Position Sensor Signal Shorted | ||
| 45772 (1) | 25772 | TP Sensor Signal Indicates Idle & Full Throttle Simultaneously | ||
| 46221 (1) | 26221 | Temperature Sensor Circuit Open | ||
| 46261 | 26261 | Temp. Sensor Signal Indicates Constant Temperature | ||
| 46271 | 26271 | Temperature Sensor Circuit Shorted | ||
| 46391 | 26391 | EGR System Function Faulty | ||
| 58121 | 38121 | MAF Meter Burn-Off Function Absent | ||
| 58321 | 38321 | AIC Valve Function Faulty | ||
| 58322 (1) | 38322 | Canister Purge Valve Function Faulty | ||
| 58371 (1) | 38371 | Injector Faulty | ||
| 58372 (1) | 38372 | Canister Purge Valve Ckt Open Or Shorted To Ground | ||
| 53882 (1) | 38382 | Canister Purge Valve Circuit Shorted To Battery Voltage | ||
| 60000 | - | Internal Monitoring | ||
| 60001 | - | ECU Fault | ||
| 60002 | - | ECU Fault | ||
| 67192 (1) | - | ECU Fault | ||
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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.