SEAT Workshop Service and Repair Manuals

Note:

Check establishes whether Motronic control unit (J220) recognises the engine operating condition.

Special tools, 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

• ● Coolant temperature at least 80 °C
• ● Throttle cable adjustment OK, checking:

=> Repair group 20; Removing and installing parts of fuel supply system; Adjusting throttle cable

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit (address word 01); carry out selection at idling.
  

• ‒ Input 08 for "Read measured value block" function and confirm with Q.

• ‒ Input 01 for "Display group number" and confirm with Q.

Only continue with the test when

• ● The coolant temperature is above 80 °C
  -Display zone 2-

• ‒ Press C key.
• ‒ Input 05 for "Display group number" and confirm with Q.

Display for operating modes in display zone 4:

• ◆ Idling:

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

• ◆ Overrun mode:

• ‒ Increase engine speed to above 3000 rpm.
• ‒ Close throttle abruptly.

• As long as the engine speed is above 1400 rpm overrun must be displayed
      Display: Overrun

• ◆ Part throttle:

• ‒ Rev up evenly.

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

• ◆ Enrichment:

• ‒ Quickly increase engine speed.

• Enrichment must be displayed briefly
      Display: Enrichment

• ‒ Switch off ignition.

• ◆ Full throttle:

• ‒ Switch on ignition.
• ‒ Input 1 for "Rapid data transfer".
• ‒ Input 01 for address word "Engine electronics" and confirm with Q.
• ‒ Press ⇒ key.

• ‒ Input 08 for "Read measured value block" function and confirm with Q.

• ‒ Input 05 for "Display group number" and confirm with Q.

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

• As long as the engine is at full throttle, full throttle must be displayed
      Display: Full throttle

• ‒ Press ⇒ button.
• ‒ Input 06 for "End output" and confirm with Q.
• ‒ Switch off ignition.

If the specifications are not attained:

• ‒ Interrogate and erase fault memory, eliminate faults if necessary => Page 01-10.
• ‒ Check accelerator mechanism for ease of operation.
• ‒ Check throttle valve potentiometer
  => Page 24-52, checking throttle valve control part.