Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

ABS ITT Mark 20 IE On Board Diagnostic (OBD)
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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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12/2/2005