© MAHLE
Product Use | OBD-II Smartbox | �
OBD-II Smartbox | �
| �
en
3.1.3 Test with engine running
When the second test has completed, proceed with the third and
final test. With the OBD-II Smartbox still attached to the vehicle
DLC, start and keep the engine running. Press the Retest button
on the OTM. The test starts and it will repeat as in the second
test but this time it will test for over 15V or 29V presence while
the engine is running.
If the voltage is higher than 15.2V for 12V system or 29.2V for
24V system, the alarm will also come on. In this situation, the
problem was caused by the regulator which had failed to regu-
late and cut OFF after reaching the preset charging voltage limit
normally set below 15V.
Also, if over 15.2V for 12V system or 29.2V for 24V system is
detected at the input or any of the vehicle Manufacturer desig-
nated pins No.1, 3, 8, 9, 11, 12 & 13 (yellow color socket) other
than OBD-II assigned protocol pins 2, 6, 7, 10, 14, 15 (blue color
socket) the LED will blink at a very fast pace. (The ‘Caution –
Check LED will illuminate).
In this case, do not plug and test with the Scan tool while engine
running as this high voltage input may damage it. Check the
charging volts to determine whether the regulator is functioning
properly.
Under normal conditions when after all the testing of the vehicle
DLC port has been done, where there are no abnormal activities,
the green ‘OK’ LED will light up. This indicates everything is OK
and it is ready for Scan tool to be plugged in.
3.2 Monitor voltage during reflash pro-
gramming
The OBD-II Smartbox can also be used to monitor OBD-II port
power output in order to ensure proper function during ECU
programming, adaptation or flashing.
The OBD-II Smartbox has a voltage monitoring feature with
voltage display which will sound an alarm warning when the
voltage falls outside a certain range. For 12V systems, the alarm
will sound if the voltage falls below 11.8V or rises above 15.1V.
For 24V systems, the alarm will sound if the voltage falls below
23.8V or rises higher than 29.2V while doing programming or
coding. This feature will minimize any error while performing
EPROM re-flashing.
