Skoda Workshop Service and Repair Manuals > Octavia Mk1 > Drive unit | 1.9 l/74 kW (TDI) Engine, Fuel Injection and Glow Plug System | Fuel preparation system Diesel injection | Testing components

Testing Intake manifold flap motorV157

Testing Intake manifold flap motor -V157-

Only on engines with identification characters AXR

Note

The functional testing of the intake manifold flap motor -V157- can also be undertaken using the actuator diagnosis → Chapter.

Special tools and workshop equipment required

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

t	Voltage tester (e. g. -V.A.G 1527/B -)

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

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

Test conditions

l	Fuse no. 34 o.k.

l	Diesel direct injection system relay -J322 - O.K., inspecting → Chapter

l	Battery voltage at least 11.5 volts

Test sequence

–	Unplug plug -arrow- from intake manifold flap motor -V157-.

–	Connect handheld multimeter for voltage measurement to contacts -1- and -2- of the 4-pin plug connection.

–	Switch on ignition.

Specified value: approx. battery voltage.

If the specified value is not reached:

–	Check the wiring of the contacts -1- and -2- for open circuit and short-circuit → Current flow diagrams and Fitting locations.

If the specification is achieved:

–	Connect voltage tester -V.A.G 1527/B- between the contacts -3- and -4- of the 4-pin plug connection.

–	Select final control diagnosis and activate intake manifold flap motor -V157- → Chapter.

Specified value: LED at voltage tester must flash.

–	Terminate final control diagnosis.

If the LED flashes, however the intake manifold flap motor -V157- is not functioning during the functional test with the final control diagnosis:

–	Replace intake manifold flap motor -V157-.

If the LED does not flash:

–	Connect test box -V.A.G 1598/31- to the wiring loom on the engine control unit (control unit is not connected) → Chapter.

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

4-pin plug on wiring loom, contact	Test box -V.A.G 1598/31 -, bush
3	81
4	75

–	If necessary eliminate wire interruption or short-circuit.

If no fault was found:

–	Replacing engine control unit -J248- → Chapter.

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