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.
Function Modes: Notes
The self-diagnosis function has 4 modes: "U" check mode, read memory mode, "D" check mode and clear memory mode. Two connectors (read memory and test mode) and two lamps (ECS and oxygen monitor) are used. The connectors are for mode selection and the lamps monitor the type of problem.
| Mode | Ignition | Read Memory Connector | Test Mode Connector |
|---|---|---|---|
| U-Check | ON | Disconnect | Disconnect |
| Read | ON | Connect | Disconnect |
| D-Check | ON | Disconnect | Connect |
| Clear | ON Engine running | Connect | Connect |
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.