01-1
ABS ITT Mark 20 IE On Board
Diagnostic (OBD)
Function
Since the control modules are interconnected
with CAN-bus, always begin OBD by checking
the Diagnostic Trouble Code (DTC) memories
of all the control modules in the vehicle.
This occurs in the Automatic test sequence and
is activated with key function 00.
When doing this, check to see if there are
DTCs stored which may influence the ABS.
On Board Diagnostic (OBD) relates to the
electrical/electronic part of the ABS, i.e. only
malfunctions via the electrical connection to the
control module are recognized (e.g. speed
sensor open circuit).
The 25-pin ABS Control Module (w/EDL) -J104-
forms with the hydraulic unit a compact unit.
The unit is located on the left in the engine
compartment. The control module is equipped
with a DTC memory. The diagnostic connection
is located in the center console below the
heating/air conditioning controls.
The control module recognizes malfunctions
during vehicle operation and stores them in a
permanent memory, the contents of which
remain even during periods of no battery
voltage.
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