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 Complete Test
Check lemon-25 TECH SERVICE BULLETINS (TSBs) for any pertinent information. If a TSB exists, perform corrective action. If TSB does not exist or if driveability problem still exists, perform tests NTC-2A through NTC-15A in sequence until driveability problem is found. See NO TROUBLE CODE TEST MENU table.
| Application | Test |
|---|---|
| Checking Secondary Ignition & Timing | NTC-2A |
| Checking Fuel Pressure | NTC-3A |
| Checking Coolant Sensor Calibration & Radiator Fan Operation | NTC-4A |
| Checking TPS Calibration | NTC-5A |
| Checking MAP Sensor Calibration | NTC-6A |
| Checking Oxygen (O2) Sensor Switching | NTC-7A |
| Checking Idle Air Control Motor | NTC-8A |
| Checking Solenoid Operations | NTC-9A |
| Checking Park/Neutral Switch | NTC-10A |
| Checking PCM Grounds & Power Circuits | NTC-11A |
| Checking EGR System | NTC-12A |
| Checking Engine Vacuum | NTC-13A |
| Checking Minimum Idle Airflow | NTC-14A |
| No Trouble Code Mechanical Test | NTC-15A |
NO RELATED
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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.