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 Technical Service Bulletins (TSBs) for any pertinent information. If a TSB exists, perform corrective procedure as instructed. If no TSB exists or if problem still exists, perform test TEST NTC-2A -TEST NTC-20A in sequence until problem is found. See NO TROUBLE CODE TEST MENU table.
| Application | Test |
|---|---|
| Checking Secondary Ignition & Timing | NTC-2A |
| Checking PCM Power & Ground Circuits | NTC-3A |
| Checking Engine Vacuum | NTC-4A |
| Checking Fuel Delivery | NTC-5A |
| Checking Coolant Sensor Calibration | NTC-6A |
| Checking Throttle Position Sensor Calibration | NTC-7A |
| Checking MAP Sensor Calibration | NTC-8A |
| Checking Minimum Idle Airflow | NTC-9A |
| Checking Oxygen Sensor Switching | NTC-10A |
| Checking Oxygen Sensor Heater | NTC-11A |
| Checking Idle Air Control Motor | NTC-12A |
| Checking Engine Mechanical Systems | NTC-13A |
| Checking Timing Belt Alignment | NTC-14A |
| Checking Evaporative Emission System | NTC-17A |
| Checking EGR System | NTC-18A |
| Checking Intake Air Temperature Sensor | NTC-19A |
| Checking Park/Neutral Position Switch | NTC-20A |
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.