Audi Workshop Service and Repair Manuals > A3 Mk1 > Power unit | Motronic injection and ignition system (4-cyl.) | Mixture preparation system, electronic inj.,Gas | Checking intake manifold changeover

Motronic injection and ignition system (4-cyl.)

Checking intake manifold changeover

Checking operation

‒ Connect vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "address word" 01 .
Engine must be idling.

→ Indicated on display:

Rapid data transfer HELP

Select function XX

‒ Press keys 0 and 8 for "Read measured value block" function and confirm entry with Q key.

→ Indicated on display:

Read measured value block

Enter display group number XXX

‒ Press keys 0, 9 and 5 for "Display group number 95" and confirm entry with Q key.

→ Indicated on display:

Read measured value block 95 ⇒

1 2 3 4


	Display zones
	1	2	3	4
Display group 95: Intake manifold changeover at idle
Display	xxx rpm	x.xx ms	xxx.x °C	SU-V OFF
Readout	Engine speed (in increments of 40)	Load	Coolant temperature	Intake manifold changeover
Operating range	min.: 660 rpm max.: 6800 rpm	min.: 0.00 ms max.: 120.00 ms		SU-V OFF SU-V ON
Specification	660...860 rpm	15.0....30.0 ms	85.0...105.0 °C	SU-V OFF
Note

‒ Increase engine speed to approx. 4500 rpm (display zone 1) and observe display in zone 4.


	Display zones
	1	2	3	4
Display group 95: Intake manifold changeover whilst driving
Display	xxxx rpm	x.xx ms	xxx.x ° C	SU-V ON
Readout	Engine speed (in increments of 40)	Load	Coolant temperature	Intake manifold changeover
Operating range	min.: 660 rpm max.: 6800 rpm	min.: 0.00 ms max.: 120.00 ms		SU-V OFF SU-V ON
Specification	4500...6800 rpm	15.0...120.00 ms	80.0...105.0 ° C	SU-V ON
Note

‒ If "SU-V ON" is displayed but vacuum unit for intake manifold changeover is not energised (fitting location: at intake manifold, front left):

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