The Toyota 2C is a 2.0L (1,974 cc) four-cylinder diesel engine. When sourcing, you must confirm the specific variant: 2C (Naturally Aspirated), 2C-L (Transverse mount), or 2C-T (Turbocharged). Key technical checks include the compression ratio (typically 23.0:1), the condition of the indirect injection system, and the integrity of the cylinder head, which is prone to cracking if overheated. Ensure the supplier provides the engine serial number to verify the production year and compatibility with the target vehicle model (e.g., Corolla, Carina, or TownAce).