Daewoo MUSSO Service Manual page 680

Test
Failure
Item
step
code
Þ 1.0 · · · · · Fuel
pressure:in
idling speed
- When the
vacuum is
applied
Þ 2.0 · · · · · Fuel
pressure:in
idling speed
- When the
vacuum is
not applied
Þ 3.0 · · · · · Fuel system
internal
leakage:
Checking method
Connect the fuel Engine:in idling
·
pressure test plug to - Colse the valve
the pressure tester
(refer to the flgure on
previous page).
Connect the fuel · Engine:in idling
pressure test plug to - Colse the valve
the pressure tester
(refer to the flgure on
previous page).
Connect the fuel · Engine:stop
pressure test plug to
the pressure tester
(refer to the flgure on
previous page).
· After 30 minutes
from engine stop
M161 ENGINE CONTROLS 1F2-29
Specified
Requirement
3.2 - 3.6 bar
screw on pressure
tester
3.7 - 4.2 bar
screw on pressure
tester
> 3.0 bar
> 2.5 bar
Possible cause
value
Þ Fuel pump test
·
Fuel pressure
·
regulator
· Þ Fuel pump test
Fuel pressure
·
regulator
· The pressure drops
rapidly:non-return
valve in fuel pump
· The pressure
drops slowly:
- Injector test
- Fuel pressure
regulator
- O-ring