Preparation For Tests (Section 22)

WARNING: When performing test and adjustment work, the engine RPM should only be raised using the accelerator pedal. If the engine speed is raised via the control linkage in the engine compartment, the "Limp Home" mode will be activated and will be registered as a DTC in the EA/CC/ISC control module. The ASR MIL will also come on.

Turn ignition OFF.
Remove LH-SFI control module (N3/2 or N3/3).
After determining which LH-SFI control module (N3/2) and/or (N3/3) is indicating a malfunction, connect socket box with contact module (140 589 02 63 00) and contact box to respective LH-SFI control module (left, right or both one after another) according to connection diagram. See Fig 1 -Fig 3 .

NOTE: The following is for test steps 1.2-1.4, 2.2-2.6, 4.0 and 35 only!

Turn ignition OFF. Remove base module (N16/1) and connect socket box with contact module (140 589 01 63 00) and contact box to base module.

If installing a LH-SFI control module from another vehicle, the control modules self adaptation feature must be reset to its mean value. See RESETTING LH-SFI CONTROL MODULE'S SELF ADAPTATION FEATURE TO MEAN VALUE under PROGRAMMING.

Fig 1: Identifying Special Tools

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Connecting Socket Box To Control Module (Model 129)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Connecting Socket Box To Control Module (Model 140)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.