SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4 cyl. injection motor (push rods), mechanics | Mixture preparation system, electronic inj.,Gas | Supplementary signals: check | Signal to/from the air conditioner: check

Testing procedure

–	Attach the unit -V.A.G. 1551- (-V.A.G. 1552-). Switch on the ignition and enter “direction code” 01 to select the engine control unit. (Fault finder: Connect and select the engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)

Display reading:

–	Press the 0 and 8 buttons for the function “Read measurement values block” and confirm the entry with the Q button.

Rapid data transfer                 HELP

Select function XX

Display reading:

–	Press buttons 0, 1, and 9 for “Display group number 19” and confirm the entry with the Q button.

Read measurement values block       HELP

Enter display group number XXX

Display reading:

Observe the value that appears in field 3. It must be

–	Observe the value that appears in field 4. The 1st digit from the right must be 00

–	Switch on the air conditioner.

–	Set the lowest temperature and the maximum turbine speed.

The value in field 3 must change to 1

The 1st digit from the right in display field 4 must change to

If the message does not change:

Read measurement values block 19       →

         1         2         3         4

–	Attach the test box -V.A.G. 1598/22- to the control unit cabling harness.

–	Check for a break in the cable between test box female socket 8 and the air conditioner, following the wiring diagram. Cable resistance: 1.5 Ω max.

–	Check for a break in the cable between test box female socket 10 and the air conditioner, following the wiring diagram. Cable resistance: 1.5 Ω max.

If there is no fault in the wiring:

–	Test the operation of the air conditioner control unit. → Vehicle diagnosis, testing and information system VAS 5051

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