109
Fig.167
If stepper motor needs to be replaced, remove the positive connector first and replace actuator. Then
turn ignition key to position 1(accessory position), ECU will readjust actuator position (to limit switch) and
adjust for steps according to engine water temperature so as to adjust idle speed with valve linear (axial
direction) movements (forward or backward).
Only CHECK-UP1 tester may be applied to check whether it’s running properly.
3.1
MARWAL low pressure fuel pump“MSS070”
The fuel pump in this system is atmospheric positive shift (see figure. 168). It is designed to work
with ethyl as its standard fuel and equipped with a check valve and a pressure override valve (vibration
pressure is 2.6bar). It is installed inside the fuel tank and equipped with a fuel filter.
Fuel pump supplies the fuel to fuel injectors and is controlled directly by ECUD to ensure:
·
The
fuel pump will close when engine speed drops under the minimum starting speed or engine stops.
The fuel pump signal is timed. Once ignition switch is on and engine is not started, there will be a fuel
pump signal within 10 seconds.
Under the engine running and starting conditions, the fuel pump signal will not change.
Fig.168
Fig.169
3.2
fuel filter
Fuel filter (see drawing 143) is connected between fuel pump and the fuel intake port of the throttle
