Skoda Workshop Service and Repair Manuals > Fabia Mk1 > Engine | 1.9/96 TDI Engine, Fuel Injection | Fuel preparation system Diesel injection | Testing components | Testing Accelerator pedal position sender G79

Testing Accelerator pedal position senderG79

Testing Accelerator pedal position sender -G79-

Special tools and workshop equipment required

t	Vehicle system tester -V.A.G 1552 -

t	Diagnostic cable -V.A.G 1551/3, 3A, 3B oder 3C-

t	Hand multimeter (e.g. -V.A.G 1526 A-)

t	Adapter cable set (e.g. -V.A.G 1594 C-)

t	Test box -V.A.G 1598/31-

t	Current flow diagram

Test sequence

–	Connect vehicle system tester -V.A.G 1552-. Switch ignition on and select address word 01 “Engine electronics”.

–	Select function 08 “read measured value block” and display group number 002.

–	Check display of accelerator pedal position in display field 2. While doing so do not press the accelerator pedal.

Specified value: 0.0 %

–	Check the additional display for the idle switch in display field 3.

Specified value: 0 1 0

Reading measured value block         2   ->

0/min      0.0 %     0 1 0     18.4 °C

–	Slowly press the accelerator pedal and observe display fields 2 and 3.

t	Display field 2: The value of the accelerator pedal position must increase gradually.

Nominal value at full throttle position: 100.0 %

t	Display field 3: The value must become 0 0 0.

–

Press →.

–	Select function 06 “End output” and confirm with Q.

–	Switch off ignition.

If the final nominal value is not reached:

–	Replace Accelerator pedal position sender -G79- → 1.9/96 TDI Engine, Mechanics; Rep. Gr.20.

If the display does not change or changes irregularly:

Test the wires of the accelerator pedal position sender as follows:

–	Connect test box -V.A.G 1598/31 - to the wiring loom on the engine control unit .

–	Remove lower part of the dash panel insert on the driver's side → Body Work; Rep. Gr.70.

–	Disconnect the connector from the accelerator pedal position sender -G79-.

Reading measured value block         2   ->

0/min      100.0 %     0 0 0     18.4 °C

–	Check the following wiring for interruption or short-circuit to earth or positive:

6-pin plug on wiring loom, contact	Test box -V.A.G 1598/31-, bush
1	63
2	12
3	50
4	69
5	70
6	51

–	Also check the wires for short-circuits.

If the lines are not found to be faulty:

–	Replace Accelerator pedal position sender -G79- → 1.9/96 TDI Engine, Mechanics; Rep. Gr.20.

If the specified values are not reached:

–	Replacing engine control unit -J248- → Chapter.

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