Check Chart 1

Check Chart 1: ETACS Power-Supply And Ground Circuits:

1. ETACS POWER-SUPPLY AND GROUND CIRCUITS

Description of Operation
The battery supplies a stabilized 5V power supply to the ECU, via the constant-voltage circuit and terminal 51 (which is directly connected to the battery).

Check Chart 1: ECU Terminal No. 51:

ECU Terminal Voltage (Connection condition of the ECU connector).