Volkswagen Golf / Golf GTI / Jetta. Manual — part 199

24-50

Checking voltage supply

If no voltage is present:

Repair Manual, Electrical

Equipment; Repair Group 92

- Connect multimeter to measure

voltage at terminals 1 and 2
(connector to Motronic Engine
Control Module (ECM) -J220-)
using adapter cables from VAG
1594.

- Start engine and run at idle

speed.

- Measure voltage supply and

observe display group 41, display
zone 4.

- Display Htg.aC.ON: Specification:

11.0 to 14.5 V

Display Htg.aC.ON / Htg.aC.OFF

(alternating): Specification:
Between 0.0 to 12.0 V fluctuating

- Switch off ignition.

- Remove wiper arms and cowl

panel:

- Connect VAG 1598/31 test box to

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

Components, checking

24-51

If the specification is obtained:

If no wiring malfunction is detected:

- Check wiring for open circuit

between test box and 4-pin
connector referring to Electrical
Wiring Diagrams.

Terminal 2 and socket 63

Wire resistance: max. 1.5

- Check wire for open circuit

between 4-pin connector terminal
1 and Fuel Pump (FP) relay -J17-
referring to Electrical Wiring
Diagrams.

Wire resistance: max. 1.5

- Replace Motronic Engine Control

Module (ECM) -J220-

Page 24-

173

.

- Check DTC memory, repair

malfunctions if necessary and
then erase DTC memory

Page

01-23

.

- Erase learned values and adapt

Motronic Engine Control Module
(ECM) -J220- again

Page 24-

182

.

- 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

.

Components, checking

24-52

Mass Air Flow (MAF) sensor -
G70- , checking

Note:

Only gold plated terminals may be
used to service terminals in the
Mass Air Flow (MAF) sensor
connector.

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

Components, checking

24-53

Test requirements

Electrical Wiring Diagrams,

Troubleshooting & Component
Locations

The 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.

Fuel Pump (FP) -J17- must be

OK., checking:

Coolant temperature must be at

least 85 C,

display group 1,

display zone 2.

Components, checking