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.
Diagnostic Method
Judge as NG when the following conditions are established.
Judgment1: Instruction check (a)
| Malfunction Criteria | Threshold Value |
|---|---|
| Instruction value | Different from expected value |
Judgment1: Instruction check (b)
| Malfunction Criteria | Threshold Value |
|---|---|
| Calculated result from CPU and FPU | Different from expected value |
Judgment2: Soft flow check
| Malfunction Criteria | Threshold Value |
|---|---|
| Process flow result | The result and expected value do not match. |
Judgment3: Soft monitor check
| Malfunction Criteria | Threshold Value |
|---|---|
| High integrated IC motor continuity cut demand | Exist |
Judgment4: If the output IC operation is abnormal
| Malfunction Criteria | Threshold Value |
|---|---|
| Communication between output driver ICs | Communication failure |
Judgment5: CAN register check
| Malfunction Criteria | Threshold Value |
|---|---|
| Writing value to CAN register | ? Read out value |
Time needed for diagnosis:
Judgment1 - (a): 2time(s)
Judgment1 - (b): 512ms
Judgment2: 504ms
Judgment3: 48ms
Judgment4: 2500ms
Judgment5: Less than 1 s
Malfunction indicator light illumination: Illuminates as soon as a malfunction occurs.
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.