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WesTech Technical Information - Mercedes Code Retrieval
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Mercedes Code Retrieval

Accessing Diagnostic Trouble Codes

With Impulse Counter

  1. With ignition switch On and shift lever in P/N position, connect impulse counter.
  2. Depress Start button for at least two seconds but no more than four seconds, read and record codes.
  3. Read codes until first code displayed appears again.
  4. Codes will appear in ascending order.

With On-Off Ratio Readout

  1. On models equipped with on board diagnostics, depress non-locking switch to convert control unit to read on-off readout ratio codes.
  2. On all models, install on-off readout ratio tester to diagnostic socket.
  3. Allow engine to idle and oil temperature to reach 140-176°F (60-80°C).
  4. 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

  1. Complete required repairs resulting from recorded codes.
  2. With impulse code displayed, wait two seconds then depress Start button for at least six seconds.
  3. Each code must be erased individually.
  4. If no number is displayed, then diagnostic trouble codes are erased from memory.
  5. 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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