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
- Abnormality Judgment
- Stuck
Judge as NG when the following conditions repeat 10 time(s) or more.
| Malfunction Criteria | Threshold Value |
|---|---|
| Difference between maximum and minimum value of output voltage | < 0.07 V |
Time Needed for Diagnosis: Less than 1 second
Malfunction Indicator Light Illumination: Malfunction indicator light does not illuminate when malfunction occurs.
- Characteristic malfunction (charging side)
Judge as NG when time of establishment of following conditions is predetermined time or more within 30000 ms after enable conditions are not established → established.
(In case of NG judgment, NG is retained during the driving cycle.)
| Malfunction Criteria | Threshold Value |
|---|---|
| Output voltage | 2.6 V ≤ Output voltage < 5 V |
| and | |
| Battery voltage | < 13.2 V |
Time Needed for Diagnosis: 26000 ms
Malfunction Indicator Light Illumination: Malfunction indicator light does not illuminate when malfunction occurs.
- Characteristic malfunction (discharging side)
Judge as NG when time of establishment of following conditions is predetermined time or more within 30000 ms after enable conditions are not established → established.
(In this case, target duty ≥ 60 % has not been experienced within 30000 ms since enable conditions is not established → established.)
| Malfunction Criteria | Threshold Value |
|---|---|
| Output voltage | 0 V ≤ Output voltage < 2.4 V |
| and | |
| Battery voltage | ≥ 13.7 V |
Time Needed for Diagnosis: 26000 ms
Malfunction Indicator Light Illumination: Malfunction indicator light does not illuminate when malfunction occurs.
- Normality Judgment
- Stuck
Judge as OK and clear the NG if the following conditions are established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Difference between maximum and minimum value of output voltage | ≥ 0.07 V |
Time Needed for Diagnosis: Less than 1 second
- Characteristic malfunction (charging side)
Judge as OK and clear NG when time of establishment of following conditions is predetermined time or less within 30000 ms after enable conditions are not established → established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Output voltage | 2.6 V ≤ Output voltage < 5 V |
| and | |
| Battery voltage | < 13.2 V |
Time Needed for Diagnosis: 26000 ms
- Characteristic malfunction (discharging side)
Judge as OK and clear NG when time of establishment of following conditions is predetermined time or less within 30000 ms after enable conditions are not established → established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Output voltage | 0 V ≤ Output voltage < 2.4 V |
| and | |
| Battery voltage | ≥ 13.7 V |
Time Needed for Diagnosis: 26000 ms
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.