1993 Mercedes Benz 400EFACTORY OEM SERVICE PROCEDURE

LH-SFI Control Module Self-Adaptation: Features

A self adaptation feature for the emission control system is incorporated into the LH-SFI control modules. If malfunctions of the Hot-wire MAF sensor, Injectors, Purge Control Valve, Diaphragm Pressure Regulator or the Purge Valve occur or if intake air leaks are present, the LH-SFI control modules conduct a self adaptation feature must be reset to its mean value. See RESETTING LH-SFI CONTROL MODULE'S SELF ADAPTATION FEATURE TO MEAN VALUEΒ  . After performing repair work on the fuel injection system, the LH-SFI control modules will also adapt themselves during the course of operation.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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