Abs Control Module

Anti-lock Brake System (ABS) control module controls ABS, EDL and TCS functions. Some TCS functions are also controlled by Powertrain Control Module (PCM). If a fault occurs in the engine control or other system affecting TCS operation, ABS control module may abort ABS operation, EDL or TCS functions. By monitoring warning lights, system at fault may be determined.

ABS module controls function for preventing brake overheating. When EDL is activated, brake application is used to prevent wheel slippage during hard acceleration. If brake temperature exceeds a predetermined value, EDL is deactivated. EDL will again be activated when brake temperature drops below a certain value. Brake temperature is a calculated value. Temperature is calculated by ABS control module. Operation of ABS and ASR are not affected by this automatic shut-off feature.

ABS control module has self-diagnostic capabilities. Using VAG 1551 tester, Diagnostic Trouble Codes (DTCs) can be retrieved. No provision was made for warning light flash code output.

ABS control module performs the function of the conventional brake pressure regulator. After a malfunction has been detected by ABS control module, the function of the brake system is limited. Brake pressure at rear wheels is no longer controlled by the Electronic Brake Distribution (EBD) function. The result can be excessive braking at rear of vehicle. Vehicle may skid unexpectedly under braking.

If ABS control module is to be replaced, the new control module coding must match vehicle application. Only ABS/ASR modules can be coded. ABS/EDL modules cannot be coded. VAG 1551 is necessary to perform module coding.