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P0315 P0xxx · 动力总成（P） 低严重度
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.
严重程度说明： 低——通常不影响行驶，下次保养时处理即可
你会注意到的故障现象
- Misfire detection unreliable
- Possible no-start after a relearn
- No obvious drivability issue
常见原因
按可能性从高到低排列——从最上面开始查。
- 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
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ 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.
维修方案
- Perform the CKP variation relearn
- Replace a damaged reluctor or flywheel
- Stabilise the charging system
P0315 —— 常见问题
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.