Preparation For Test

Special Tools (Part 1 Of 3):

Special Tools (Part 2 Of 3):

Special Tools (Part 3 Of 3):

SPECIAL TOOLS
NOTE: Some or all of the special tools shown in the image are required to perform these testing procedures. If Mercedes special tools are not available, select tools may be substituted with an aftermarket equivalent.

Additional Tools
Suggested Engine Analyzer
^ Bear DACE (Model 40-960)
^ Sun EMT-1019/Master 3
^ Sun MCM-2110
^ Sun MEA-15OOMB
Suggested Multimeter
^ Sun DMM-5
^ Fluke Model 23 with 80i-410 current probe
^ Fluke Models 83, 85 or 87

PREPARATION FOR TEST
1. Ignition: OFF.
2. Remove LH control unit (N3/2 or 3/3).

Test Equipment Hook-up:

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.
4. Test steps 1.2 - 1.4, 2.2 - 2.6, 4, 5 and 35 only:
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 (see Test Steps BM 1.0 - 23.0).BM (Base Module)

NOTES:
a. 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 become active and will be registered in the electronic accelerator malfunction memory as a fault. The Acceleration Slip Regulation (ASR) malfunction indicator lamp will also come on.
b. If installing an LH control unit from another vehicle, the control unit's self-adaptation feature must first be reset to its mean value. Programming and Relearning
c. Note regarding "Test Connection" column:
The numbers indicated in parentheses, for example, (1.23) signify:
1 = Connector 1 on wiring diagram,
23 = Socket 23 on wiring diagram.