BentleyCD-AFP-CheckingEngineSpeedSensor.pdf

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24-84

Engine speed (RPM) sensor -

G28-, checking

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 and equipment

VAG1551 Scan Tool (ST) or

VAG1552 mobile scan tool with

VAG1551/3 adapter cable

VAG1598/31 test box

Multimeter (Fluke 83 or

equivalent)

VW1594 adapter set

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Wiring diagram

Test sequence

- Disconnect grey 3-pin harness connector (arrow) from engine

speed sensor

.

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- Measure sensor resistance between terminals 2 + 3 of harness

connector to sensor.

Specified value: 480-1000

- Check sensor for short between terminals 1 + 2 as well as -1- +

-3-.

Specified value:

If the specified values are not obtained:

- Replace engine speed (RPM) sensor -G28-

Page 24-13 ,

item 25 .

- Check DTC memory. If necessary, repair any malfunctions and

erase DTC memory

Page 01-32 .

- Display readiness code

Page 01-93 .

If DTC memory has been erased or the Engine Control Module

(ECM) was disconnected from permanent battery (B+) voltage,

the readiness code must be generated again

Page 01-95 .

If no sensor malfunction is detected:

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- Remove wiper arms and plenum chamber cover.

Repair Manual , Electrical Equipment, Repair Group 92

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- Connect VAG1598/31 test box to Engine Control Module

(ECM) wiring harness. Engine Control Module (ECM) is not

connected by this action.

- Check wiring between test box and 3-pin harness connector for

open circuit according to wiring diagram.

Terminal -1- + socket 108

Terminal -2- + socket 90

Terminal -3- + socket 82

Wire resistance: max. 1.5

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