Volkswagen Golf / Golf GTI / Jetta. Manual — part 209

24-90

If no wiring malfunction is detected:

- Check wiring for open circuit

between test box and 5-pin
connector referring to Electrical
Wiring Diagrams.

Terminal 1 and socket 26

Terminal 3 and socket 27

Wire resistance: max. 1.5

- Additionally check wiring for short

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

Specification:

- Perform a resistance

measurement on Intake Air
Temperature (IAT) sensor -G42-
terminals 1 (signal) and 3
(Ground).

Components, checking

24-91

Scale A shows resistance values for

temperature range 0 to 50 C and
scale B the values for temperature
range 50 to 100 C.

Examples:

If the specification is not obtained:

30 C is in range A and

corresponds to a resistance of
1.5 to 2.0 k

80 C is in range B and

corresponds to a resistance of
275 to 375

- Replace Mass Air Flow (MAF)

sensor -G70-

Page 24-30

,

item 6 .

- 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

24-92

If there is no Diagnostic Trouble Code (DTC) in

the wiring and the resistance measurement
values are OK.:

- 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

24-93

Engine Speed (RPM) Sensor -G28-,
checking

Function

The Engine Speed (RPM) Sensor -G28- is a
speed and reference mark sensor. The engine
will not start if there is no speed signal. If the
speed signal fails when the engine is running, it
will cause the engine to stall immediately.

Special tools, materials and equipment

VAG 1526 or Fluke 83 Hand multimeter or VAG

1715 multimeter

VAG 1594 Adapter set

VAG 1598/31 test box

Electrical Wiring Diagrams

Test sequence

- Separate gray 3-pin connector (arrow) to Engine

Speed (RPM) Sensor.

Components, checking