Volkswagen Golf / Golf GTI / Jetta. Manual — part 227

24-162

Motronic Engine Control
Module (ECM) -J220-

Function

The Motronic Engine Control Module (ECM)

-J220- regulates the injection, Throttle Valve
Control Module -J338-, Oxygen Sensor
control, ignition, knock regulation,
Evaporative Emissions (EVAP) canister
purge regulator valve, speed limitation via
fuel injectors or Fuel Pump (FP) relay,
camshaft timing adjustment as well as On
Board Diagnostic (OBD).

Motronic Engine Control Module (ECM) -J220-

24-163

Engine Control Module (ECM)
voltage supply, checking

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

Motronic Engine Control Module (ECM) -J220-

24-164

Test requirements

The fuses must be OK.

The main fuses must be OK.

The battery voltage must be at

least 11.5 V.

All electrical accessories, e.g.

lights and rear window defroster
must be switched off.

If the vehicle is equipped with air

conditioning, it must be turned
off.

Selector lever must be in

position "P" or "N" on vehicles
with an automatic transmission.

Motronic Engine Control Module (ECM) -J220-

24-165

Fuel Pump (FP) -J17- must be OK, checking:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

Motronic Engine Control Module (ECM)

Power Supply Relay -J271- must be OK.,
checking:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

Alternator OK., checking:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

Test sequence

- Connect VAG 1551 Scan tool (or VAG 1552)

and select engine electronics control module
with"Address word" 01. Engine must be running
at idle speed: ((VAG 1551 and Motronic Engine
Control Module (ECM) -J220-, connecting and
selecting

Page 01-12

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -8- for function "Read

measured value (data) block" and confirm entry
with -Q- button.

Read measured value block

Input display group number XXX

Indicated on display:

Motronic Engine Control Module (ECM) -J220-