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U0002 U0xxx · ネットワーク (U) 重大度中
High Speed CAN Communication Bus Performance
The bus still works but with errors, retries or degraded signal quality. Far more common than a total bus failure and much harder to spot.
重大度の目安： 中 — 走行性または排出ガスに影響。今週中に点検を予約してください
確認できる症状
- Intermittent warning lamps
- Random module dropouts
- Faults that clear themselves
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 Corroded or loose connector terminal
- 2 Aftermarket equipment teed into the bus
- 3 Water ingress in a junction connector
- 4 Marginal earth raising noise
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ Check for recently fitted aftermarket equipment first — trackers, alarms and audio interfaces are frequent culprits.
- ✓ Wiggle the harness while watching for bus errors.
- ✓ Inspect junction connectors for moisture.
- ✓ Scope for ringing or a collapsed recessive level.
修理の選択肢
- Remove or correctly interface aftermarket equipment
- Clean and reseat connectors
- Repair the affected wiring section
U0002 — よくあるご質問
Why does it only happen in the rain? +
Water in a connector changes bus capacitance. Find the wet junction and seal it.
Can a tracker really break the bus? +
Yes. Anything teed into CAN without proper interfacing distorts the signal.