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Mercedes Code Retrieval
Accessing Diagnostic Trouble Codes
With Impulse Counter
- With ignition switch On and shift lever in P/N position, connect
impulse counter.
- Depress Start button for at least two seconds but no more than four
seconds, read and record codes.
- Read codes until first code displayed appears again.
- Codes will appear in ascending order.
With On-Off Ratio Readout
- On models equipped with on board diagnostics, depress non-locking
switch to convert control unit to read on-off readout ratio codes.
- On all models, install on-off readout ratio tester to diagnostic
socket.
- Allow engine to idle and oil temperature to reach 140-176°F
(60-80°C).
- Read and record on-off readout ratio codes.
With Scan Tool
A hand-held tester can be connected to the underhood data link
connector (DLC) X11/4 located at module box, or a generic scan tool can be
connected to the generic connector X11/22 located in the tower edge of the
instrument panel. To access diagnostic trouble codes, follow the tool
manufacturer's instructions.
Clearing Diagnostic Trouble Codes
With Impulse Counter
- Complete required repairs resulting from recorded codes.
- With impulse code displayed, wait two seconds then depress Start
button for at least six seconds.
- Each code must be erased individually.
- If no number is displayed, then diagnostic trouble codes are erased
from memory.
- If code higher than one appears, codes are still stored in memory.
With Scan Tool
To clear DTC's, follow the scan tool manufacturer's instructions.
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