SEAT Workshop Service and Repair Manuals

Notes:

• ◆ Idling speed, ignition timing and CO content not adjustable.
• ◆ Idling speed is regulated to specification by engine control unit.
• ◆ CO content regulated by Lambda regulation. Faults in Lambda control are detected in self-diagnosis and stored in fault memory.

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

Check conditions

• ● Exhaust system between cylinder head and catalyst free of leaks
• ● Coolant temperature must be at least 80 °C, =>display group 04, display zone 3.
• ● All electrical consumers, e.g. lights and rear window heating must be switched off
• ● If the vehicle is equipped with an air conditioning system, this must be switched off.
• ● On vehicles with automatic gearbox the selector lever must be in "P" position.
• ● No faults must be stored in fault memory
  , interrogating fault memory

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 => Page 01-9.)
• ‒ Interrogate fault memory, if necessary, repair fault and then erase fault memory.
  => Page 01-17, interrogating and erasing fault memory
• ‒ Then:
• ‒ Leave fault reader V.A.G 1551 connected.
• ‒ Continue running engine at idling speed.

• ‒ Press keys 0 and 4 for the function "Initiating basic settings" and confirm entry with Q key.

• ‒ Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.

Note:

In the "System in basic setting" function the activated charcoal filter solenoid valve 1 (N80) is closed and the air conditioner compressor switched off.

• ‒ Check the adjustment conditions for basic setting in display zone 4:
      Specification: 1x111111
  Significance of the numbers => Page 01-101
• ‒ Briefly increase engine speed (rev- up) and then allow engine to run at idling speed for 2 minutes.

Checking idling speed

• ‒ Change to display group 56 as follows:
• ‒ Press C key.
• ‒ Press keys 0, 5 and 6 for "Display group number 56" and confirm entry with Q key.

• ‒ Check the operating mode in display zone 4
      Specification: 0x000
  (Significance => Page 01-135)
• ‒ Check the specified idling speed in
  display zone 2.
      Specification: 820 rpm
• ‒ Check idling speed in display zone 1.
      Specification: 750...860 rpm1)

    1)    Up-to-date specifications:

=> Exhaust emissions test binder

Note:

During idling check the activated charcoal filter solenoid valve and the air conditioner are switched off and the Lambda regulation learning procedure is initiated.

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.

If the idling speed is not obtained:

• ‒ Adapt the engine control unit to the throttle valve control part => Page 24-111
• ‒ Carry out test drive.
• ‒ Again interrogate the control unit fault memory.
• ‒ Repeat the idling check.

If the specifications are not obtained again:

• ‒ Check throttle valve control part
  => Page 24-38.
• ‒ Check the operating condition of engine
  => Page 24-101.
• ‒ Check the intake air system for unmetered air
  => Page 24-79