Volkswagen Golf / Golf GTI / Jetta. Manual — part 229

24-170

"Voltage supply open circuit,"
followup procedure

All values learned by the Motronic
Engine Control Module (ECM) -
J220- and the basic setting values
as well as the readiness code will be
erased if the voltage supply is
interrupted. Therefore, depending
upon the vehicle mileage it can lead
to serious engine running problems.

Special tools 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

Motronic Engine Control Module (ECM) -J220-

24-171

Work sequence

Perform the following operations after

interrupting voltage supply:

- Switch ignition on for at least 10 seconds.

- Switch off ignition.

- Erase learned values and adapt Motronic

Engine Control Module (ECM) -J220- again

Page 24-182

.

- Perform idle speed check

Page 24-125

.

Note:

During idle speed check the Evaporative

Emission (EVAP) Canister Purge Regulator
Valve -N80- and the air conditioner compressor
are switched off and the Oxygen Sensor control
learning procedure is initiated.

- Generate readiness code

Page 01-149

.

- Perform a longer road test until poor driving

characteristics are eliminated.

Observe the valid safety precautions when

performing a road test

Page 24-33

.

Motronic Engine Control Module (ECM) -J220-

24-172

During the road test the following operating

conditions must be fulfilled:

Engine Coolant Temperature (ECT) must

exceed 80 C .

When the temperature is reached, the

operating conditions

Idling

Part throttle

Wide open throttle

Overrun

must be obtained several times.

At wide open throttle the speed must exceed

3500 rpm.

Motronic Engine Control Module (ECM) -J220-

24-173

Motronic Engine Control
Module (ECM) -J220-,
replacing

Special tools 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

Motronic Engine Control Module (ECM) -J220-