Volkswagen Golf / Golf GTI / Jetta. Manual — part 200

24-54

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:

- Press buttons -0-, -0- and -2- for "Display group

number 2" and confirm entry with -Q- button.

Read measured value block 2

1

2

3

4

Indicated on display: (1...4

display zones)

- Check mass of air drawn in, in display zone 4

Specification: 3.0 to 5.0 g/s

- Press

button.

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

Components, checking

24-55

- Switch off ignition.

If the specification is achieved but an Mass Air
Flow (MAF) related Diagnostic Trouble Code
(DTC) is registered in Diagnostic Trouble Code
(DTC) memory:

- Check voltage supply for Mass Air Flow (MAF)

sensor -G70-

Page 24-55

.

If the specification is not obtained:

- Check signal and Ground (GND) wires for Mass

Air Flow (MAF) sensor -G70-

Page 24-

Checking voltage supply for Mass Air Flow
(MAF) sensor

- Disconnect 5-pin connector from Mass Air Flow

(MAF) sensor -G70- with Intake Air Temperature
(IAT) sensor -G42- (arrow).

Components, checking

24-56

If no voltage is present:

If the voltage supply and wiring is
OK.:

- Connect multimeter to measure

voltage at connector terminal 2
and engine Ground (GND).

- Start engine and run at idle

speed.

Specification: 11.0 to 15.0 V

- Switch off ignition.

- Check wire for open circuit

between 5-pin connector terminal
2 and Fuel Pump (FP) -J17-
referring to Electrical Wiring
Diagrams.

Wire resistance: max. 1.5

- Connect multimeter to measure

voltage at connector terminal 4
and engine Ground (GND).

- Switch on ignition

Specification: at least 4.5 V

- Switch off ignition.

Components, checking

24-57

If no voltage is present:

- Check signal and Ground (GND) wires for Mass

Air Flow (MAF) sensor

Page 24-57

.

Checking signal and Ground (GND) wires for
Mass Air Flow (MAF) sensor

- 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

and 5-pin connector referring to Electrical Wiring
Diagrams.

Terminal 3 and socket 27

Terminal 4 and socket 53

Terminal 5 and socket 29

Wire resistance: max. 1.5

Components, checking