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P0315 P0xxx · パワートレーン (P) 重大度低
Crankshaft Position System Variation Not Learned
The ECU has lost its learned crankshaft position variation values, which it uses to detect misfire accurately. Common after an ECU replacement, a flywheel change or a software update.
重大度の目安： 低 — 通常は走行性への影響なし。次の定期点検時に対処してください
確認できる症状
- Misfire detection unreliable
- Possible no-start after a relearn
- No obvious drivability issue
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 ECU replaced or reflashed without a relearn
- 2 New or resurfaced flywheel / flexplate
- 3 Crankshaft reluctor damage
- 4 Weak battery interrupting the learn procedure
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 whether the vehicle has recently had ECU or clutch work — that is the usual story.
- ✓ Run the manufacturer's crankshaft variation relearn procedure with a capable scan tool.
- ✓ Ensure battery voltage is stable above 12.4 V during the procedure.
- ✓ Inspect the reluctor wheel if the relearn will not complete.
修理の選択肢
- Perform the CKP variation relearn
- Replace a damaged reluctor or flywheel
- Stabilise the charging system
P0315 — よくあるご質問
Can I clear the code and drive away? +
It will come back and misfire monitoring stays disabled. Do the relearn properly.
Does every car need this procedure? +
Most modern petrol engines do. Check the service manual for the specific decel-fuel-cutoff routine.