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P0351 P0xxx · パワートレーン (P) 重大度高
Ignition Coil A Primary / Secondary Circuit Malfunction
The ECU monitors the coil primary circuit for cylinder 1 and sees a fault — open, short, or a coil that does not draw the expected current.
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
- Rough running
- Flashing MIL
- Possible no-start on single-coil engines
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 ignition coil
- 2 Open or shorted wiring to the coil
- 3 Corroded connector
- 4 Failed ECU ignition driver
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。
- ✓ Swap the coil with another cylinder — if the code follows, replace the coil.
- ✓ Check for battery voltage at the coil connector and a switched earth from the ECU.
- ✓ Scope the primary waveform to check dwell and switching.
- ✓ Inspect the connector for corrosion and pushed-out pins.
修理の選択肢
- Replace the ignition coil
- Repair the wiring or connector
- ECU repair if the driver stage has failed
P0351 — よくあるご質問
Is coil or plug more likely? +
Coils fail more often than plugs on modern engines, but plugs are cheaper — inspect both before ordering.
Do I need to replace all of them? +
If one has failed from age, the rest are close behind. Replacing the set avoids repeat labour.