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.
Hinweis zum Schweregrad: Niedrig — meist ohne Einfluss auf die Fahrsicherheit, bei der nächsten Wartung beheben
Symptome, die Ihnen auffallen
- Misfire detection unreliable
- Possible no-start after a relearn
- No obvious drivability issue
Häufige Ursachen
Von wahrscheinlich bis unwahrscheinlich sortiert — beginnen Sie oben.
- 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
Fehlerbehebung
Zuerst das Günstigste und am wenigsten Invasive — die meisten dieser Codes sind kein Teileproblem.
- ✓ 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.
Reparaturoptionen
- Perform the CKP variation relearn
- Replace a damaged reluctor or flywheel
- Stabilise the charging system
P0315 — häufig gestellte Fragen
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.
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