Data wire between Engine Control Module (ECM) and ABS control module, checking

Special tools and equipment 

Fig 1: Special Tool - Multimeter V.A.G 1526 A

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• VAG1526A multimeter

Fig 2: Identifying V.A.G 1594 A Adapter Set

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• VAG1594A connector test kit

Special tools and equipment 

Fig 3: VAG 1598/21 Adapter From VAG 1598 A Test Box

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• VAG1598/21 adapter from VAG1598 A test box

Engine Control Module (ECM) and ABS control module are connected to each other via a databus. The databus consists of two data wires, via which information (e.g. engine torque, engine speed) is transmitted.

• Connect VAG1598/21 test box to ABS control module wiring harness.

The following wire connections must be checked for short circuit to B+, short circuit to Ground (GND) and for open circuit