Volkswagen Golf / Golf GTI / Jetta. Manual — part 203

24-66

- 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

.

Checking voltage supply and wiring to
control module

- Connect multimeter to measure voltage at

connector terminals 2 (positive) and 6 (Ground
(GND)).

- Switch on ignition.

Specification: at least 4.5 V

- Switch off ignition.

If the specifications are not obtained:

- Connect multimeter to measure voltage at

connector terminal 2 (positive) and Ground
(GND).

- Switch on ignition.

Specification: at least 4.5 V

- Switch off ignition.

Components, checking

24-67

- Remove wiper arms and cowl

panel:

Repair Manual, Electrical

Equipment, Repair Group 92

- Connect VAG 1598/31 test box to

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

- Check wiring for open circuit

between test box socket and
connector referring to Electrical
Wiring Diagrams:

Terminal 1 and socket 92

Terminal 2 and socket 83

Terminal 3 and socket 117

Terminal 4 and socket 84

Terminal 5 and socket 118

Terminal 6 and socket 91

Wire resistance: max. 1.5

Components, checking

24-68

- Additionally check wiring for short to one

another, to vehicle Ground(GND) and to battery
positive.

Specification:

If no wiring malfunction is detected:

- Check Motronic Engine Control Module (ECM) -

J220- voltage supply

Page 24-163

.

- 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

.

Components, checking

24-69

Engine Coolant Temperature (ECT)
sensors -G62- and -G2-, checking

Note:

The Motronic Engine Control Module (ECM)

-J220- will use a replacement value for an
engine start (start temperature replacement
value) as soon as there is a Diagnostic
Trouble Code (DTC) stored in the DTC
memory, which affects the Engine Coolant
Temperature (ECT) sensor -G62-. The
temperature then rises according to a model
stored in the control module. When the
engine has reached normal working
temperature a fixed replacement value will
be displayed after a certain period.

Components, checking