Test Box, Connecting For Wiring Test

Test Box, Connecting For Wiring Test

Requirement
- Ignition switched off.

Connect test box to wiring harness of Engine Control Module (ECM).
Connect test box to wiring harness of Transmission Control Module (TCM).

Connecting test box to wiring harness of Engine Control Module (ECM)

Recommended special tools and equipment e.g.:







- V.A.G 1598/42 test box







- V.A.G 1598/39-1 adapter cable
- V.A.G 1598/39-2 adapter cable

Work procedure






- Remove E-Box cover (arrows).







- Unclip ECM retaining bracket.
- Disengage connector from control module and disconnect.







- Connect test box (V.A.G 1598/42) to control module wiring harness using adapter cable (V.A.G 1598/39-1 or V.A.G 1598/39-2). Engine Control Module (ECM) is not connected.

When harness connectors are disconnected from the Engine Control Module (ECM) or the battery is disconnected, all adaptation values in control module are erased. DTC memory content will remain intact however. If the engine is started after this, rough, uneven idle can result for a short time. In this case, the readiness code must be generated again. Monitors, Trips, Drive Cycles and Readiness Codes

Connecting test box to Transmission Control Module (TCM)
Recommended special tools and equipment e.g.:







- V.A.G 1598/20 test box

Work procedure

NOTE: The Transmission Control Module (TCM) is located under floor carpet in footwell in front of front passenger's seat.

- Remove lower right A-pillar trim and door sill molding:
- Loosen carpet and fold back.







- Unclip Transmission Control Module (TCM) out of box (arrows).
- Disengage connector from control module and disconnect.







- Install TCM wiring harness to test box (V.A.G 1598/20) -1-, swing in -2- and lock -3-.