: #10 , #20 , #30 , and #40 representing individual fuel injector outputs.

: IGT1–4 for ignition coil signals and IGF for the ignitor feedback signal.

: +B / BAT for permanent 12V power, IGSW for switched ignition power, and E01 / E02 for main earth grounds.

A Vios ECU typically uses multi-pin plugs (commonly 4-plug or 5-plug configurations) to connect with the engine harness. Key terminal abbreviations often found in these diagrams include:

The overall electrical wiring guide for the Vios links several critical systems to the ECU:

: Newer models include complex wiring for the "Smart Entry & Start" system, involving a dedicated "Main Body ECU" and certification ECU. Troubleshooting & Modifications 1sz Fe Ecu Pinout - sciphilconf.berkeley.edu