Volkswagen Golf / Golf GTI / Jetta. Manual — part 242

24-222

If the specifications are not
obtained:

- Remove wiper arms and cowl

panel:

Repair Manual, Electrical

Equipment; Repair Group 92

Electrical Wiring Diagrams,

Troubleshooting & Component
Locations

- Connect VAG 1598/31 test box to

control module wiring harness.
Engine Control Module (ECM) -
J220- remains disconnected.

- Check wiring for open/short circuit

from Motronic Engine Control
Module (ECM) -J220- to CCS
operating switch:

- Check DTC memory, repair

malfunctions if necessary and
then erase DTC memory

Page

01-23

.

- Read readiness code

Page 01-

146

. If DTC memory has been

erased or Motronic Engine
Control Module (ECM) -J220- was
disconnected from battery
positive (B+), readiness code
must be generated again

Page

01-149

.

Additional signals, checking

24-223

CAN-bus, checking

Function

The Motronic Engine Control Module (ECM)

-J220- communicates with other CAN-bus
compatible control modules via a CAN-bus.

These CAN-bus-capable components are

connected by a pair of twisted CAN-bus
wires (CAN high and CAN low) and
exchange information (messages).
Information missing from the CAN-bus is
recognized as an error and stored.

The CAN-bus requires a matching resistor

to function fault free. This matching resistor
is located in the Motronic Engine Control
Module (ECM) -J220-.

Additional signals, checking

24-224

Special tools, materials and
equipment

Note:

All functions which could previously
be performed with VAG 1551/1552
can also be performed with the VAS
5051.

VAG 1551 Scan tool (or VAG

1552) with VAG 1551/3 adapter
cable

VAG 1526 or Fluke 83 Hand

multimeter or VAG 1715
multimeter

VAG 1594 Adapter set

VAG 1598/31 test box

Electrical Wiring Diagrams

Additional signals, checking

24-225

Test requirements

The CAN-bus On Board Diagnostic (OBD)

has detected a Diagnostic Trouble Code
(DTC).

Test sequence

- Remove wiper arms and cowl panel:

Repair Manual, Electrical Equipment; Repair

Group 92

- Connect VAG 1598/31 test box to Motronic

Engine Control Module (ECM) -J220-. ECM
wiring harness is not connected by this action.

- Check centralized matching resistor in Motronic

Engine Control Module (ECM) -J220-. To do
this, check resistance between test box

Sockets 58 and 60.

Specification: 60 to 72

Additional signals, checking