Ignition Switch On

Ignition supply voltage is applied to the electric power steering-ECU, and the ECU enters standby mode.

Fig 1: Ignition Switch Communication Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

1. When the engine is started, the engine speed signal sent from the engine control module (ECM) is input to the electric power steering-ECU.
2. After starting the engine, the electric power steering-ECU judges the engine status "ENGINE SPEED ON" when the engine speed reaches 500 r/min, then the power assist function is ready.