SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | Manual 4-cyl. injection engine (4 valves), mechanics | Mixture preparation system, electronic inj.,Gas | Checking components | Intake air temperature sender: checking

Test sequence

–	Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Switch on ignition and use address word 01 to select engine control unit. (Connecting fault reader and selecting engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)

Indicated on display:

–	Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.

Rapid data transfer                 HELP

Select function XX

Indicated on display:

–	Press keys 0, 0 and 2 for “Display group number 2” and confirm entry with Q key.

Read measured value block

Input display group number XXX

Indicated on display: (1...4 = Display fields)

–	Read off intake air temperature value in display zone 4.

Read measured value block            2 →

Displayed value	Cause	Continue checking
-40 °C	Open circuit or short to positive	→ Chapter
120 °C	Short to earth	→ Chapter
Approx. ambient temperature → Note	---	→ Chapter

¹⁾	If a temperature is displayed which is below the ambient air temperature of the sender, check sender wiring for transfer resistances. Note when doing this that sender is heated from external sources, e.g. radiated heat when engine is not running.

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