SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | Diesel preheating and injection system | Fuel preparation system Diesel injection | Components and functions | Idle speed, idle speed acceleration and maximum speed: verification and adjustment

Idle speed, idle speed acceleration and maximum speed: verification and adjustment

Special tools and workshop equipment required

t	Fault reader -V.A.G 1551-

t	-V.A.G 1551/3B- cable

Note!

The equipment -V.A.G 1552- may be used instead of the -V.A.G 1551-, however in this case the results cannot be printed.

Verification and adjustment conditions

l	Minimum oil temperature 60 °C

l	Consumer electrics, disconnected

Operation sequence

The engine revolution rate can be also read by the measurement block of the self-diagnosis using the fault reader -V.A.G 1551-.

–	Connect the fault reader -V.A.G 1551-.

–	Start the engine and let it run at idle.

Idling speed

–	Adjust the idle adjustment screw -1-.

Theoretical value: 900 ± 30/min

Increase in the idle speed

When the engine is cold or the air conditioning comes on, the actuator element for engine idle acceleration increases the idle engine speed.

–	When the engine is hot, press the handle to the limit against the adjustment screw -2-. The engine speed should increase to 1050 ± 50/min.

If the measured value differs from the ideal value:

–	Loosen the counter nut of the screw to the limit -2- and adjust the increased idle speed to 1050/min by turning the limit screw.

–	Tighten the counter nut to the limit.

–	Check the idle speed → Chapter.

Maximum speed (no charge)

To count the revolution rate with no charge, continue as follows:

–	Accelerate fully and adjust the idle speed with the adjustment screw -arrow-.

Theoretical value: 5050 ± 100/min

–	Tighten the counter nut to the limit.

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