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 MANUALSVOLVO1993960 4D WAGON, AW30-43REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES
1993 Volvo 960 4D Wagon, AW30-43
Engine Controls - Tests W/Codes
1993 Volvo 960 4D Wagon, AW30-43SECTION Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Component Locations
- Fault Code Testing
- Connecting Measuring Unit To Ecu
- Code 1-3-1 Or 2-1-4 (Timing Pick-Up Signal)
- Code 1-3-2 (Battery Voltage)
- Code 1-4-3 Or 4-3-3 (No Front/Rear Knock Sensor Signal)
- Code 2-2-3 (No Idle Valve Signal)
- Code 2-3-1 (Lambda Control Rich Or Lean In Part-Load Range) Or Code 2-3-2 (Lambda Control Rich Or Lean At Idle)
- Code 2-3-3 (Idle Control Not In Range)
- Code 2-4-1 (EGR Flow Too Low)
- Code 2-4-3 (Throttle Switch Signal Absent Or Faulty)
- Code 3-1-1 (Speedometer Signal)
- Code 3-1-4 (Camshaft Sensor Signal)
- Code 3-2-2 (Airflow Meter Hot Wire)
- Code 4-1-3 (EGR Temperature Sensor Absent/Faulty)
- Code 5-1-1 (Short-Term Fuel Trim, Idling)
- Code 5-1-2 (Short Term Fuel Trim)
- Summary
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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.