Abs Control Module

Anti-lock Brake System (ABS) control module controls ABS, EDL, ASR and ESP functions. Some traction control functions are also controlled by Engine Control Module (ECM). If a fault occurs in engine controls or other systems affecting TCS operation, ABS control module may abort ABS, EDL or traction control functions. Warning lights will let the driver know which a system may be at fault.

ABS control 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.

There are no serviceable parts in control module, only possible repair is replacement. If ABS control module is to be replaced, the new control module coding must match vehicle application. Only ABS/ASR/ESP modules can be coded. On vehicles equipped with ABS/EDL only, modules cannot be coded. VAG 1551 scan tool is necessary to perform module coding. See FUNCTION 07 - CODE CONTROL MODULE  under DIAGNOSIS.