Scania DC9 - DEC2 DIP Switch Settings

2003-10:1 © Scania Industrial & Marine Engines 17
Resetting functions with DIP switches in
control unit
There are 8 DIP switches in the control unit under the
round black rubber cover.
These switches should be in the ON position for
normal operation in accordance with the driving
program. For single speed engines, it may also be
normal for DIP switches 6, 7 and 8 to be in the OFF
position.
Shutdown at threshold values for low oil pressure and
high coolant temperature can be selected by setting
DIP switch 4 to OFF.
With DIP switch 4 in position ON, Power- indication
is obtained for these threshold values. Engine power
output reduction (LOP) can then be selected to prevent
damage to the engine. Changes to the program may be
made by authorised personnel only.
Note: The engine should only be used in an
emergency when the Power- indication
comes on.
Reading fault codes
Note: If the engine has stopped or lost power but
the main indicator lamp is out and neither
POWER- nor SHUTDOWN are on, the fault
is outside the control unit's detection area.
Probable causes: fuel starvation, temporary
overload, mechanical fault.
- Activate the lamp test/fault code switch. In
Scania's electrical equipment the main indicator
lamp is located in this switch in the main supply
box.
- All LEDs will then come on for 2 seconds to
indicate that they are intact and in working order.
This also applies to the main indicator lamp in the
main supply box and on the instrument panel
.
Make a note of any LED that is defective.
- All LEDs will then go out for approximately
4 seconds.
- Following this, a fault code will be indicated on
one of the LEDs for 2 seconds. Note which LED
it is.
- The control unit will then automatically return to
operating mode.
- After having made a note of the fault code, reset
the lamp test/fault code switch and reset the
control unit by turning off its power supply
momentarily.
- The most probable cause of the fault can then be
found in the troubleshooting schedule on the next
page.
- When the fault or faults have been rectified the
engine can be restarted.
- If the control system still gives an indication on
the main indicator lamp, other faults may be
registered. The fault codes must then read again
as above since the system can only show one fault
code at a time.
- The fault or faults will be logged in a special
memory in the control unit where the operating
time concerned is recorded. Stored faults can be
accessed and erased by authorised service
personnel.