: Labeled A, B, C, and D, these house various pins responsible for engine and transmission management.

This likely refers to:

The Toyota 2NZ-FE engine is a highly reliable 1.3-liter powerhouse found in popular models like the Toyota Yaris, Vitz, Echo, and Belta. For automotive enthusiasts, mechanics, and DIYers looking to diagnose electrical issues, perform engine swaps, or wire up a piggyback ECU, having the exact is critical.

: Includes expected voltage readings for each pin under different conditions, such as "Ignition ON" vs. "Engine Idling".

: The guide typically covers the 4-connector PCM system found in vehicles like the Toyota Echo (1999–2004).

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