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.:

Vehicles with 80-pin Engine Control Module (ECM, engine code AHA, AEB)







- V.A.G 1598/22 test box

Vehicles with 121-pin Engine Control Module (ECM, engine code ATQ, ATW, AUG, AWM)







- V.A.G 1598/31 test box

Work procedure







- Remove securing screws at cover of protective housing for control modules -arrows- and remove cover.







- Using a screwdriver, carefully pry off retaining bracket (arrow).
- Then disengage connector from control module and disconnect.

Vehicles with 80-pin Engine Control Module (ECM, engine code AHA, AEB)







- Connect V.A.G 1598/22 test box to control module wiring harness.

Vehicles with 121-pin Engine Control Module (ECM, engine code ATQ, ATW, AUG, AWM)







- Connect V.A.G 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.

Continuation for all vehicles
When harness connectors are disconnected from the Engine Control Module (ECM) or the battery is disconnected, all adaptation values in the 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 upward.







- Unclip Transmission Control Module (TCM) out of box -arrows-
- Then disengage connector from control module and disconnect.
Observe safety precautions.







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