•
Connect the test leads to the fault code signal pins of the diagnostic
socket and then trigger the fault code output.
•
Typical fault code output triggering procedure is to short (close
circuit) the two trigger pins of the diagnostic socket and then turn
the ignition key to the ON position. DO NOT start the engine.
•
Location of the diagnostic socket, signal pins assignment, signal
type, and procedures of triggering & clearing the fault code may
be varied with car models. Consult your vehicle service manual
for manufacturer's speci
fi
cations. The display indicates a symbolic
pulse and the beeper turns on when the blink code pulse is
detected.
•
Time interval between pulse signals and duration of pulse signal
represent the blink type fault code numbers.
•
As an example, some car manufacturers use long pulse for the
fi
rst
code digit, and short pulse for the second code digit. In this case,
2 long 'Beeps' followed by 5 short 'Beeps' represented
fault code
number 25. As another example, some car manufacturers use
same time interval between pulse signals on the same code digit,
and with longer time interval to separate the code digits. In this
case 2 short 'Beeps' followed by a quiet interval and then followed
by 5 short 'Beeps' represented fault code number 25.
•
Please note that in some car models, fault code signal output is
preceded by leading pulse signals.
•
As a typical procedure for clearing the fault code stored in the
memory. Turn the ignition key to the OFF position. Disconnect the
negative (
) battery terminal from the car electrical system for
about 1 minute, and the fault code will be cleared from memory.
Some car models require speci
fi
c procedure to clear the fault code
stored, consult your vehicle service manual for details.
4.3.12 DTC-DECODER Function
6- Trigger the DTC readout by Shorting (close circuit) the 2 signal
pins of the data link connector for about 4 seconds until the
secondary LCD shows "
". Then the meter is ready to scan
the DTC readout automatically.
7- During scanning the meter secondary display indicates a pulse
symbol "
", and the beeper turns on when a DTC pulse is
detected.
If the DTC scanning is not successful, the meter secondary
display will indicate "
" to alert the user. Re-check the wire
connections, and start the trigger process again.
If the DTC scanning is successful, the meter secondary display
will indicate code "
" with 4 beep sounds, and the main
display indicates the correct DTC readout.
8- Read and note DTC readout displayed on the LCD Display "1" =
no fault stored, Greater than "1" = fault in system.
9- Repeat procedure in step 6. If there are no further faults in the
system, the previously displayed DTC will be displayed.
10- Repeat procedure in step 9 until the
fi
rst
DTC
displayed is
repeated.
11- Eliminate (repair) all noted faults (
DTC
readout) of the car
according to troubleshooting chart and diagnostic tests.
12- After eliminating a fault, the respective
DTC
may be cleared
by repeating procedure on step 6 to get the
DTC
readout, and
then short the 2 signal pins for another 6 to 10 seconds, then
the
DTC
displayed is cleared. Please note that each
DTC
displayed must be cleared individually.
*Note: Consult your Mercedes Benz Diagnostic Trouble Code
Reference Guide for signal pins assignments and engine
precondition procedures before triggering the
DTC
readout. They
might be different from car model to model, and function to function.
5. ADVANCED OPERATION
See table below for feature availability on each function.
Function
Data
Hold
Range
Lock
40,000
Count
Relative Record
Crest
(Peak)
+/-
Trigger
Trigger
Level
No. of
Cylinders
Dual
Display
Store
Recall
DC Voltage
•
•
•
•
•
•
•
•
AC Voltage
•
•
•
•
•
•
•
•
Temperature
•
•
•
•
•
DC Current
•
•
•
•
•
•
•
AC Current
•
•
•
•
•
•
•
Resistance
•
•
•
•
•
•
RPM
•
•
•
•
•
Frequency
•
•
•
•
•
•
Duty Cycle
•
•
•
•
•
•
•
-ms
•
•
•
•
•
•
•
Dwell
•
•
•
•
•
•
•
O2 Sensor
•
•
•
Continuity
•
•
•
•
•
Diode
•
•
•
•
•
Alternator Test
•
•
•
Fault Code
•
•
•
DTC Decoder
•
•
•
5.1 40,000 COUNTS HIGH RESOLUTION Mode
Press the
button momentarily to enter the 4-3/4 digit high
resolution slow mode with a maximum display at 40,000 counts.
Press the button momentarily again to return to 3-3/4 digit fast
mode. In 3-3/4 digit fast mode, the digital display updates 5 times per
second nominal to give you the maximum measuring speed. In 4-
3/4 digit slow mode, the digit display updates 1.25 times per second
nominal to give you smooth readings as well as the full accuracy of
the meter.
1- Set rotary switch to
DTC-Decoder
2
-
Default at
. Press SELECT button two times to select
DTC-Decoder
3- Insert Red (
) test lead into
jack and black (
) test lead
into COM input jack
4- *Connect the test leads to the signal pins of the data link
connector. This function is a replacement of the impulse counter
scan tool with wire connections COM for black (bk), and
for yellow (yw) as speci
fi
ed in the Mercedes-Benz Diagnostic
Trouble Code Reference Guide. Since the meter is powered by
internal battery, connection of the impulse counter red (rd) wire
(to B+) for external power is not required
5- *Set Engine at idle
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