Function

ABS ITT Mark 60 IE, On Board Diagnostic (OBD)
Function
As the control modules are interconnected with a data bus wire, always begin troubleshooting by checking Diagnostic Trouble Code (DTC) memories of all the control modules in the vehicle.
This occurs in "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.
The 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. wheel speed sensor open circuit).
The 47-pin ABS control module -J104- forms a compact assembly with the hydraulic unit. The unit is located on the left in the engine compartment. The control module is equipped with a DTC memory. The OBD Data Link Connector (DLC) 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 without battery voltage.
Sporadic (isolated) malfunctions will also be recognized and stored. But if these malfunctions do not occur again within the next 50 vehicle starts and driving off sequences then, with the exception of malfunction "Control module faulty", the DTC memory will be erased.
After switching on the ignition and/or starting the engine the ABS warning light -K47- and the warning light for brake system -K118- light up for approximately 2 seconds.
For vehicles with ABS/ASR, after switching on the ignition and/or starting the engine the ESP Control lamp -K155- lights up for approximately 2 seconds.
During this period a test sequence (self-check) is run in the control module for the following functions:
^ Check that supply voltage is at least 10.0 Volt,
^ Check control module including the valve windings,
^ Check coding of the control module,
^ A static check of the wheel speed sensor (no speed signal),
^ If after driving off and exceeding a speed of approximately 20 km/h (approximately 13 mph) the speed signal is not OK, the ABS warning light -K47- will light up again.