Preparation For Test

Special Tools:

SPECIAL TOOLS
NOTE: 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-l5OOMB
Suggested Multimeter
^ Sun DMM-5
^ Fluke Model 23 with 80i-410 current probe

Test Equipment Hook-up:

PREPARATION FOR TEST
1. Ignition: OFF.
2. After determining which control unit (N1/4) and/or (N1/5) is indicating a malfunction, connect socket box to respective EZL/AKR ignition control unit (left, right or both one after another) according to connection diagram.


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. Note regarding "Test Connection" column:
The numbers indicated in parentheses, for example, (A.2) signify:
1 = Connector A
2 = Socket 2 in wiring diagram
c. Ensure that the engine and ignition are turned of when connecting/disconnecting equipment such as voltage signal pick-up on ignition cable 4 and trigger pick-up on cylinder 1 or 7.