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 DIAGNOSISCRUISE CONTROLTESTING AND INSPECTIONACCESSING TROUBLE CODES
1991 Hyundai Sonata V6-3.0L
Accessing Trouble Codes
1991 Hyundai Sonata V6-3.0LSECTION Accessing Trouble Codes
Fig. 4 Accessing Trouble Codes Using Tester Tool:
Fig. 5 Accessing Trouble Codes Using Voltmeter:
Fig. 6 Speed Control Diagnosis Display Patterns & Codes:
The check connector is located in the fuse box, there are two methods of accessing trouble codes.
1. Connect a multi-use tester 09391-33000 to cigarette lighter socket and self-diagnosis check connector, Fig. 4.
2. Connect a suitable voltmeter between ground and ASC of diagnosis check connector, Fig. 5.
3. If diagnosis codes No. 11, 12, 15, or 16 are displayed, refer to Fig. 6. for troubleshooting.
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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.