Audi Workshop Service and Repair Manuals > A3 Mk1 > Power unit | Simos injection and ignition system (4-cylinder) | Mixture preparation system, electronic inj.,Gas | Checking electronic engine power control (electronic throttle) | Checking accelerator position sender

Test sequence

–	Connect vehicle diagnostic, testing and information system -VAS 5051- or fault reader -V.A.G 1551- and select engine electronics control unit by entering “address word ” 01. For this purpose, the ignition must be switched on.

Indicated on display:

–	Enter “08” for the function “Read measured value block” and confirm entry with the Q key.

Rapid data transfer            HELP

Select function XX

Indicated on display:

–	Enter “062” for “Display group number 062” and confirm entry with the Q key.

–	Check specifications for electronic throttle potentiometer voltages.

Reading measured value block                  Q

Enter display group number XXX

	Display zones
	1	2	3	4
Display Group 062: Electronic throttle potentiometer voltages
Display	xx %	xx %	xx %	xx %
Readout	Throttle valve angle (angle sender 1)	Throttle valve angle (angle sender 2)	Accelerator position sender	Accelerator position sender 2
Range	0...100 %	100...0 %	0...100 %	0...100 %
Specification	5.9...92.2 %	95.1...8.7 %	12...97 % (idling value 8...18 %)	4...49 % (idling value 3...13 %)

Note!

The engine control unit converts and displays the voltage readings from the angle senders as percentages of 5 V. (5 Volt supply corresponds to 100%).

–	Observe readouts in display zones 3 and 4.

–	Slowly depress accelerator pedal.

Percentage displayed in zone 3 should rise evenly. The tolerance range from 12...97 % is not fully utilised.

Percentage displayed in zone 4 should also rise evenly. The tolerance range from 4...49 % is not fully utilised.

Note!

The value displayed in zone 3 must always be about twice as large as that in zone 4.

If the displays are not as described:

–	Check that the connector to the accelerator position sender is fitted securely and properly engaged and check the contacts in the connector for corrosion.

–	Check the voltage supply and wiring to the accelerator position senders → Chapter.

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