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.
1994 Hyundai Excel GL, StandardFACTORY OEM SERVICE PROCEDURE
Harness Inspection
- Check sensor ground circuit to ECM. Disconnect sensor harness connector. Using ohmmeter, check resistance between terminal No. 6 (Black wire) and vehicle ground. If continuity does not exist, inspect and repair circuit.
- Check sensor signal circuit to ECM. Turn ignition on. Using DVOM, measure voltage between harness connector terminal No. 4 (Green/Brown wire on Sonata 4-cylinder, Green/Black wire on Sonata V6, Green/Blue on Elantra and Excel, and ground. Voltage should be 4.5-4.9 volts. If voltage is not within specification, check continuity of circuit.
- Turn ignition off. On all models except California Elantra and Excel, go to step 4). On California Elantra and Excel models, disconnect ECM harness connector. Connect jumper wire between ECM connector terminal No. 10 (Green/Blue wire, 22-pin connector) and vehicle ground. See Figure . Using ohmmeter, check resistance between AFS harness connector terminal No. 4 (Green/Blue wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, substitute ECM with known good unit and retest.
- On all models except California Elantra and Excel, disconnect ECM harness connector. Connect jumper wire between ECM connector terminal No. 3 (Green/Black wire, 24-pin connector) on Sonata V6 or terminal No. 5 (Green/Blue wire, 24-pin connector) on all others and vehicle ground. See Figure . Using ohmmeter, check resistance between AFS harness connector terminal No. 4 (Green/Black wire on Sonata V6, Green/Blue wire on all others) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, substitute ECM with known good unit and retest.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.