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.
No Trouble Code Quick Symptom Test
Symptom checks cannot be used properly unless the driveability problem characteristic actually happens while the vehicle is being tested. To reduce diagnostic time, ensure that TEST TC-1A is reviewed before attempting to diagnose a symptom.
Select symptom that most accurately describes the vehicle's driveability problem and then perform the test pertaining to this symptom. Perform each test in sequence until problem is found. See NO TROUBLE CODE QUICK SYMPTOM TEST MENU table.
| Application | Test | ||
|---|---|---|---|
| Hard Start | NTC-2A , 3A-8A , 11A , 14A , 15A | ||
| Start & Stall | NTC-2A , 3A-6A , 8A , 11A , 15A | ||
| Hesitation/Sag/Stumble | (1) * | ||
| Surge | NTC-2A , 3A-8A , 11A , 12A , 15A | ||
| Lack Of Power/Sluggish | NTC-2A , 3A-8A , 11A , 13A , 15A | ||
| Spark Knock/Detonation | NTC-2A , 3A-9A , 11A , 12A , 15A | ||
| Cuts Out/Misses | NTC-2A , 3A , 7A , 9A , 11A , 13A , 15A | ||
| Backfire/Popback | NTC-2A , 3A , 6A , 7A , 11A , 13A , 15A | ||
| Runs Rough/Unstable/Erratic Idle | (1) * | ||
| Poor Fuel Economy | (1) * | ||
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NO RELATED
Use the Manual With the Right Hardware
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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.