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.
Self-Diagnostic System: Notes
The PCM is equipped with a self-diagnostic system, which detects system failures or abnormalities. When malfunction occurs, the Malfunction Indicator Light (MIL) on the instrument cluster is turned on.
By analyzing various input signals, the PCM detects system malfunctions compared to various sensor operating parameters. The PCM stores Diagnostic Trouble Codes (DTCs) associated with the detected failure until the PCM memory is cleared. For further information, see appropriate SELF-DIAGNOSTICS article.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.