SEAT Workshop Service and Repair Manuals

Note:

Whether engine control unit recognises the engine operating modes idling, overrun, part throttle, full throttle and enrichment is checked.

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3

Test conditions

• ● Coolant temperature must be at least 85 °C, =>display group 04, display zone 3.

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine control unit .)

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

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

• ‒ Check whether the control unit recognises the operating mode (display zone 4):

• ◆ Idling:

• As long as the engine is running at idling speed idling must be displayed
      Display: Idling

• ◆ Part throttle:

• ‒ Rev up evenly.

• As long as the engine is being revved up evenly, part throttle must be displayed
      Display: Part throt.

• ◆ Enrichment:

• ‒ Floor accelerator pedal (onto throttle valve stop).

• Acceleration enrichment must be displayed briefly
      Display: Enrich.

• ◆ Overrun mode:

• ‒ Increase engine speed to above 3000 rpm.
• ‒ Close throttle valve abruptly.
      Display: Overrun

Note:

A test drive may have to be performed to show "Overrun" in display.

A 2nd person is required when performing a test drive.

Observe the valid safety precautions when carrying out a road test => Page 24-32.

• ◆ Full throttle:

• ‒ Floor accelerator pedal (onto throttle valve stop).

• Full load must be displayed briefly
      Display: Full throt.

Note:

A test drive may have to be performed to show "Full throttle" in display.

A 2nd person is required when performing a test drive.

Observe the valid safety precautions when carrying out a road test => Page 24-32.

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.

If the specifications are not attained:

• ‒ Check throttle valve control part
  => Page 24-57.
• ‒ Interrogate fault memory, if necessary, repair any faults and then erase fault memory => Page 01-16, interrogating and erasing fault memory.
• ‒ Read-out the readiness code=> Page 01-64.