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P0201 P0xxx · パワートレーン (P) 重大度高
Injector Circuit Malfunction — Cylinder 1
The ECU detects an electrical problem on the cylinder 1 injector driver circuit: open, short, or a coil that is out of specification.
重大度の目安： 高 — 走行を止めてすぐに診断してください。さらに損傷が広がる恐れがあります
確認できる症状
- Hard misfire on cylinder 1
- Fuel smell from the exhaust
- Rough running
- Possible catalyst damage from raw fuel
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 Failed injector coil
- 2 Open or shorted injector wiring
- 3 Corroded injector connector
- 4 Failed ECU driver (rare)
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。
- ✓ Confirm the misfire follows the cylinder with a misfire counter, not just a feel.
- ✓ Measure injector resistance at the connector and compare with specification.
- ✓ Swap the injector with another cylinder; if the fault moves, the injector is bad.
- ✓ Use a noid light or scope the injector pulse to check the ECU is driving it.
修理の選択肢
- Replace the faulty injector
- Repair the wiring or connector
- ECU repair if the driver stage is dead
P0201 — よくあるご質問
Can I drive with a dead injector? +
No — raw fuel washes the cylinder and destroys the catalytic converter within a short distance.
Should I replace all injectors? +
If mileage is high, replacing the full set avoids doing the labour twice; at minimum have the whole set flow-tested and cleaned.