Description & Operation: Notes

Multi-Point Injection (MPI) is a computerized emission and fuel system which controls fuel, ignition and idle speed. The Electronic Control Unit (ECU), determines at which point each injector supplies fuel. The MPI system controls air/fuel ratio, ignition timing, Idle Speed Control (ISC), fuel pressure and purge control. See Fig 1 and Fig 2 .

Fig 1: MPI System Circuit Diagram (Van/Wagon)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: MPI System Circuit Diagram (Galant)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.