SEAT Workshop Service and Repair Manuals

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

• ◆ V.A.G 1551 Fault reader

Note:

The vehicle system tester V.A.G 1552 can be used instead of the fault reader V.A.G 1551, however a print-out is not possible.

• ◆ V.A.G 1551/3 Cable

Test conditions

• ● → The fuses must be OK.
• ● The battery voltage must be at least 11.5 V.
• ● Exhaust system between catalyst and cylinder head must be free of leaks
• ● No faults must be stored in fault memory

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ● Coolant temperature must be at least 80 °C, =>display group 01, display zone 2.
• ● Catalyst temperature must be at least 350 °C, =>Display group 205, display zone 2

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select the engine control unit with the "Address word" 01. Connecting fault reader and selecting engine control unit:

=> Repair group 01; Self-diagnosis general: Connecting fault reader V.A.G 1551 and selecting engine electronics control unit.

• ‒ Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

Note:

During some tests it may happen that a subsequent test has already been performed successfully in the background. In this case, continue with the next test.

Checking Lambda probe heating before catalyst

• ‒ Press keys 2, 0 and 5 for "Display group number 205" and confirm entry with Q key.

Only continue with the test when

• ● Catalyst temperature exceeds 350 °C
  -display zone 2-

• ‒ Depress brake pedal and hold.
• ‒ Press accelerator pedal to wide-open position.

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4.

If the display does not indicate as described:

• ‒ Press ⇒key.
• ‒ Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ‒ Read out the readiness code:

=> Repair group 01; Readiness code; Reading out readiness code

• ‒ If the fault memory has been erased or the engine control unit separated from the permanent positive, the readiness code must be generated again.

=> Repair group 01; Readiness code; Generating readiness code

If the display indicates as described:

• ‒ Check Lambda probe ageing before catalyst (probe dynamics) .

Checking Lambda probe ageing before catalyst (probe dynamics)

• ‒ Change to display group 212 as follows:
• ‒ Press C key.

• ‒ Press keys 2, 1 and 2 for "Display group number 212" and confirm entry with Q key.

• ‒ Depress brake pedal and hold.
• ‒ Press accelerator pedal to wide-open position.

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4 after about 80 seconds.

If the display does not indicate as described:

• ‒ Press ⇒key.

• ‒ Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ‒ Read out the readiness code:

=> Repair group 01; Readiness code; Reading out readiness code

• ‒ If the fault memory has been erased or the engine control unit separated from the permanent positive, the readiness code must be generated again.

=> Repair group 01; Readiness code; Generating readiness code

If the display indicates as described:

• ‒ Check fuel supply system at partial load => Page 26-14.

Checking fuel supply system at partial load

• ‒ Change to display group 216 as follows:
• ‒ Press C key.

• ‒ Press keys 2, 1 and 6 for the "Display group number 216" and confirm entry with Q key.

• ‒ Depress brake pedal and hold.
• ‒ Press accelerator pedal to wide-open position.

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4 after about 75 seconds.

If the display does not indicate as described:

• ‒ Press ⇒key.
• ‒ Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ‒ Read out the readiness code:

=> Repair group 01; Readiness code; Reading out readiness code

• ‒ If the fault memory has been erased or the engine control unit separated from the permanent positive, the readiness code must be generated again.

=> Repair group 01; Readiness code; Generating readiness code

If the display indicates as described:

• ‒ Check Lambda probe heating after catalyst => Page 26-16.

Checking Lambda probe heating after catalyst

• ‒ Change to display group 220 as follows:
• ‒ Press C key.

• ‒ Press keys 2, 2 and 0 for "Display group number 220" and confirm entry with Q key.

• ‒ Depress brake pedal and hold.
• ‒ Depress accelerator pedal to wide-open position

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4.

If the display does not indicate as described:

• ‒ Press ⇒key.
• ‒ Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ‒ Read out the readiness code:

=> Repair group 01; Readiness code; Reading out readiness code

• ‒ If the fault memory has been erased or the engine control unit separated from the permanent positive, the readiness code must be generated again.

=> Repair group 01; Readiness code; Generating readiness code

If the display indicates as described:

• ‒ Check Lambda probe after catalyst
  => Page 26-17.

Lambda probe after catalyst

• ‒ Change to display group 222 as follows:
• ‒ Press C key.

• ‒ Press keys 2, 2 and 2 for "Display group number 222" and confirm entry with Q key.

• ‒ Depress brake pedal and hold.
• ‒ Depress accelerator pedal to wide-open position

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4 after about 30 seconds.

If the display does not indicate as described:

• ‒ Press ⇒key.
• ‒ Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ‒ Read out the readiness code:

=> Repair group 01; Readiness code; Reading out readiness code

• ‒ If the fault memory has been erased or the engine control unit separated from the permanent positive, the readiness code must be generated again.

=> Repair group 01; Readiness code; Generating readiness code

If the display indicates as described:

• ‒ Check Lambda probe ageing after catalyst (probe dynamics) => Page 26-19.

Checking Lambda probe ageing after catalyst (probe dynamics)

• ‒ Change to display group 225 as follows:
• ‒ Press C key.

• ‒ Press keys 2, 2 and 5 for "Display group number 225" and confirm entry with Q key.

• ‒ Depress brake pedal and hold.
• ‒ Depress accelerator pedal to wide-open position

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4 after about 15 seconds.

If the display does not indicate as described:

• ‒ Press ⇒key.
• ‒ Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit

• ‒ Read out the readiness code:

=> Repair group 01; Readiness code; Reading out readiness code

• ‒ If the fault memory has been erased or the engine control unit separated from the permanent positive, the readiness code must be generated again.

=> Repair group 01; Readiness code; Generating readiness code

If the display indicates as described:

• ‒ Check catalyst => Page 26-20.

Checking catalyst

• ‒ Change to display group 227 as follows:
• ‒ Press C key.

• ‒ Press keys 2, 2 and 7 for "Display group number 227" and confirm entry with Q key.

• ‒ Depress brake pedal and hold.
• ‒ Depress accelerator pedal to wide-open position

• The engine speed is increased by the control unit to
      approx. 2 300 rpm.

• ‒ Allow engine to run at increased speed until
      Specification: x x x x x 1 0 0
  appears in display zone 4 after about 60 seconds.
• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ Switch off ignition.

If the display does not change as described:

• ‒ Renew catalyst
  => Page 26-4, item 11.