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P0315 P0xxx · 동력계 (P) 심각도 낮음
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.
심각도 안내: 낮음 — 주행성에 영향이 거의 없으며 다음 정비 시 처리하세요
확인할 수 있는 증상
- Misfire detection unreliable
- Possible no-start after a relearn
- No obvious drivability issue
주요 원인
가능성이 높은 순서로 정렬되어 있습니다. 위부터 확인하세요.
- 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
점검 방법
비용이 적고 침습적이지 않은 항목부터 — 대부분의 코드는 부품 문제가 아닙니다.
- ✓ 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.
수리 방법
- Perform the CKP variation relearn
- Replace a damaged reluctor or flywheel
- Stabilise the charging system
P0315 — 자주 묻는 질문
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.