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 MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
1991 Hyundai Sonata V6-3.0L
Computers and Control Systems: Technical Service Bulletins
1991 Hyundai Sonata V6-3.0LSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- All Technical Service Bulletins
- Engine Controls - ECM Replacement and Testing Procedures
- Exhaust System - Excessive Sulfur Odors
- Diagnostic System Adapter Cables - Ordering
- HDS Scan Tool - Part Numbers
- Engine Performance - Misfire Code Diagnosis
- Scan Tool Software - Update Information
- HDS Scan Tool - Loaner Program
- HDS Scan Tool - Part Numbers.
- Diagnostic Scanner - Parts Replacement Numbers
- Vehicle - Diagnostic System Technical Support
- A/T - Driveability Concerns
- Engine - Idle Surge/Rough Idle
- A/T - Harsh 4-3 Downshift When Decelerating
- ECU - Testing Precautions
- Scan Tool - Software Update Procedure
- Engine Coolant Temperature Sensor - Diagnosis
- Oxygen Sensor - Contamination
- Oxygen Sensor - Operation/Diagnosis
- Engine Fault Code - Diagnostic Manual Correction
- Engine Fault Code - Diagnostic Manual Update
- Engine Controls - O2 Sensor Connector Guidelines
- Power Steering Pump - Pressure Switch Cautions
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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.