Golf Mk4
Test conditions
Work sequence
Work step 1: Interrogate fault memory |
→ Indicated on display: |
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→ The number of faults stored or "No fault recognised!" will be shown on the display. |
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If a fault is stored:
If no fault is stored:
Work step 2: Erase fault memory |
→ Indicated on display: |
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Note: The readiness code is reset or erased each time fault memory is erased. |
→ Indicated on display: |
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Note: If the ignition is switched off between "Interrogate fault memory" and "Erase fault memory" the fault memory will not be erased.
Work step 3: Matching the throttle valve control part to the engine control unit |
→ Indicated on display: |
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→ Indicated on display: |
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→ Indicated on display: |
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If the display does not indicate as described:
Work step: 4
Note:
Work step 5: Secondary air system diagnosis |
→ Indicated on display: |
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→ Indicated on display: |
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Indicated on display: (1...4 = Display zones) |
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If the diagnosis is initiated from engine control unit the display in display zone 4 jumps from "Test OFF" to "Test ON"
If the display does not indicate as described:
If the display indicates as described:
Work step 6: Activated charcoal filter system diagnosis (tank venting system) |
→ Indicated on display: |
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Indicated on display: (1...4 = Display zones) |
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When the diagnosis is initiated by the engine control unit the display in display zone 4 jumps from "Test OFF" to "Test ON"
If the display does not indicate as described:
If the display indicates as described:
Work step 7: Lambda probe ageing diagnosis (cycle duration monitor) |
→ Indicated on display: |
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→ Indicated on display: |
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Indicated on display: (1...4 = Display zones) |
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Note: This process can take a few minutes.
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→ Indicated on display: |
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Indicated on display: (1...4 = Display zones) |
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Note: The Bits in display zone 2 are set to 1 first when the catalyst temperature exceeds 352 °C (=> display group 34, display zone 2). Significance of 3 digit number block in display zones 1 and 2:
If the specifications are not obtained:
If the specifications are obtained:
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→ Indicated on display: |
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→ Indicated on display: |
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Indicated on display: (1...4 = Display zones) |
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If the specifications are not attained:
If the specification is obtained: Work step 8: Catalyst diagnosis Note: The diagnosis will only be terminated if the Lambda probe ageing diagnosis is first successfully completed.
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→ Indicated on display: |
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Indicated on display: (1...4 = Display zones) |
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Note: The diagnosis of the catalyst takes approx. 100 seconds. If there is still no result in the display after 150 seconds, change the speed within the tolerance.
If the specifications are not attained:
If the specification is obtained: Work step 10: Read out readiness code
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