Executive devices [Toyota RAV4 XA10]

EFI main relay electronic Fuel Injection (EFI) supplies voltage to the fuel pump. The relay is controlled by two electrical circuits. The first circuit is controlled by the engine control unit (PCM), and the second by the ignition switch. If the engine fails to start after the ignition is turned on, the PCM will deactivate the fuel pump relay after 2 seconds. Subsequently, when the engine starts, the relay activates the fuel pump after the first pulse from the camshaft position sensor.

Injectors are opened individually in accordance with the cylinder firing order by signals from the PCM. The PCM controls the opening time of the injectors (pulse duration), which determines the amount of fuel supplied to the engine cylinders.

Switch on 1996 to 1998 models, it converts the PCM control pulses into current pulses in the primary winding of the ignition coil. The PCM uses signals from various sensors to calculate the required spark advance setting and ignition coil energy storage time.

Valve of the idle speed control system (IAC - Idle Air Control) controls the amount of air entering the engine cylinders at idle speed.

Vacuum valve (VSV) Evaporative Emission Control System (EVAP) - A solenoid valve controlled by the PCM to clean the fuel canister and supply fuel vapor to the intake manifold for combustion. This valve is also called the purge control valve.

(The article was copied from the portal: «Toyotaman.ru»)