Your engine's computer has corrupted memory that stores learned settings, like a notebook with smudged writing. The ECU can't remember critical adjustments it made to run smoothly, causing performance issues.
The ECU continuously writes adaptive data (fuel trim, idle corrections, shift points) to Keep Alive Memory powered by the battery. During startup and shutdown, the module performs checksum verification on this stored data. If bit corruption is detected during memory integrity checks, the fault sets.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| KAM Checksum Verification | Checksum matches stored value at power-up | Checksum mismatch detected; data integrity failure |
| Memory Write Integrity | Data successfully written and read-back verified | Write-verify failed; memory cell error |