If resistance is within specification:

• Remove air cleaner.

Fig 1: Releasing ABS Control Module Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Release ABS Control Module J104 connector and remove.
• Check wiring between engine and ABS Control Module for short to ground and for short to positive (B+).

If no wiring damage is found:

• Reconnect Engine Control Module (ECM) J248 connector.

Fig 2: Connecting Test Box V.A.G 1598/21 To ABS Control Module

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect test box V.A.G 1598/21 - 1  - to ABS Control Module wiring harness - 2  -.
• Check terminal resistor in Engine Control Module (ECM) J248 :
• Measure resistance between test box sockets 10 + 11:

Specification: 115 to 135 Ω

If resistance is outside specification:

• Replace Engine Control Module (ECM) J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing  .

• Check wiring for short to battery positive (B+) or ground.
• Check DTC memory, if necessary, repair any malfunctions and erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing  .
• Display readiness code → Readiness code, displaying  . If DTC memory has been erased, reset readiness code → Readiness code, setting  .

If no wiring damage is found:

• Reconnect Transmission Control Module (TCM) J248 connector.
• Switch on ignition.
• Erase DTC memory and road test.

Observe safety precautions when driving road test → Safety precautions  .

• Recheck DTC memory for all Control Modules using "automatic test sequence".

If a DTC on CAN-bus system in Engine Control Module (ECM) J248 is still displayed after a test drive:

• Replace Transmission Control Module (TCM) J217 → 01 ON BOARD DIAGNOSTIC (OBD)
• Check DTC memory, if necessary, repair malfunctions and erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing  .
• Display readiness code → Readiness code, displaying  . If DTC memory has been erase, reset readiness code → Readiness code, setting  .