PCM "SNAPSHOT" Test

The PCM snapshot feature is designed to assist in diagnosis of intermittent or unrepeatable problems. When a PCM snapshot is taken, all or some of the PCM's data and input parameters from that moment in time are stored for retrieval through the on-board diagnostic system and use in diagnosing a problem. PCM snapshots are taken in three instances; when most codes are set, when Customer Snapshot is initiated, or when Take PCM Snapshot is commanded in on-board diagnostics. All PCM snapshot data may be accessed through the PCM SNAPSHOT option in on-board diagnostics. The PCM snapshot selection is used for three things:

• To record a snapshot while in diagnostics.
• To retrieve snapshot data recorded while in on-board diagnostics or in the Customer Snapshot mode.
• To retrieve PCM code snapshot data.