Work sequence
- Connect VAG1551 Scan Tool (VAG1552). Switch ignition on and select engine control module with "Address word" 01. (Connecting Scan Tool and selecting engine control module → VAG1551 scan tool, connecting and selecting engine control module .)
Work step 1: Check Diagnostic Trouble Code (DTC) memory
Indicated on display
| Rapid data transfer HELP Select function XX |
- Press keys 0 and 2 for function "Check DTC memory" and confirm entry with Q key.
The number of DTCs stored or "No DTC recognized!" will be shown on the display.
| X DTCs recognized! |
If a DTC is stored:
- Repair DTCs printed out using DTC table: SAE P0 codes → Diagnostic Trouble Code (DTC) table: SAE P0 codes SAE P1 codes → DTCs P1102 to P1238, VAG17510 to 18570
If no DTC is stored:
- Press → key.
- Continue with work step 3.
Work step 2: Erase DTC memory
Indicated on display
| Rapid data transfer HELP Select function XX |
- Press keys 0 and 5 for function "Erase DTC memory" and confirm entry with Q key.
- The readiness code is reset or erased each time the DTC memory is erased.
Indicated on display
| Rapid data transfer → DTC memory is erased! |
- If the ignition is switched off between "Check DTC memory" and "Erase DTC memory" the DTC memory will not be erased.
- Press → key.
Work step 3: Matching the throttle valve control module to the engine control module
Indicated on display:
| Rapid data transfer HELP Select function XX |
- Press keys 0 and 4 for function "Introduction of basic setting" and confirm entry with Q key.
Indicated on display
| Basic setting Input display group number XXX |
- Press keys 0 , 6 and 0 for "Display group number 60" and confirm entry with Q key.
Indicated on display: (1...4 = Display zones)
| System in basic setting 60 → xxx % xxx % x ADP. runs |
- Check specifications in display zones 3 and 4:
Display zone 3: 0...8
Display zone 4: ADP. runs, ADP. OK
Indicated on display: (1...4 = Display zones)
| System in basic setting 60 → xxx % xxx % 8 ADP. OK |
- End engine basic setting at earliest after 30 seconds by pressing → key.
If the display does not indicate as described:
- Check throttle valve control module → Throttle valve control module, checking .
If the display indicates as described:
- Start engine and run at idling speed.
- During the work sequence the engine must not be switched off.
Work step 4: Temperature check
Indicated on display
| Rapid data transfer HELP Select function XX |
- Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.
Indicated on display
| Read measured value block Input display group number XXX |
- Press keys 0 , 0 and 4 for "Display group number 4" and confirm entry with Q key.
Indicated on display: (1...4 = Display zones)
| Read measured value block 4 → 1 2 3 4 |
- Read coolant temperature value in display zone 3.
Specification: 60 to 80 ° C
- Read intake air temperature value in display zone 4.
Specification: maximum 80 ° C
If specifications are not obtained:
- Press → key.
- Press keys 0 and 6 for "End data transfer" function and confirm input with Q key.
- Switch ignition off and allow engine to cool down.
- Repeat readiness code.
If display indicates as described:
- Press → key.
Indicated on display
| Rapid data transfer HELP Select function XX |
Work step 5: EVAP system diagnosis (tank venting system)
- Press keys 0 and 4 for "Introduce basic setting" function and confirm entry with Q key.
Indicated on display
| Basic setting Input display group number XXX |
- Press keys 0 , 7 and 1 for "Display group number 71" and confirm entry with Q key.
Indicated on display: (1...4 = Display zones)
| Basic setting 71 → 1 2 3 4 |
- Allow engine to continue running at idling speed.
If diagnosis is initiated from the engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON"
- Continue to run engine at idling speed until specification "Syst. OK" is displayed in display zone 4.
- If the display in display zone 4 jumps from "Test ON" to "Test OFF" during the diagnosis and "Abort" is displayed in display zone 2, repeat the Leak diagnosis. When repeating the diagnosis it can take up to approx. 60 seconds before the display in display zone 4 jumps from "Test OFF" to "Test ON".
- Press C key.
Work step 6: Diagnosis of oxygen sensor status
Indicated on display
| Basic setting Input display group number XXX |
- Press keys 0 , 3 and 0 for the "Display group number 30" and confirm entry with Q key.
Indicated on display: (1...4 = Display zones)
| Basic setting 30 → 1 2 3 4 |
- Allow engine to continue running at idling speed.
- Check operating condition of oxygen sensor control before catalyst (display zone 1):
Specification: x11
- Check operating condition of oxygen sensor control after catalyst (display zone 2):
Specification: xxx
- The bits in display zone 2 will not be set to 1 until the catalyst temperature rises above 350 ° C Display group 34, display zone 2).
Significance of 3 digit number block in display zones 1 and 2:
| Significance if display = 1 | |||
| 1 | 2 | 3 | |
| 1 | Oxygen sensor control active | ||
| 1 | Oxygen sensor operationally ready | ||
| 1 | Oxygen sensor heating on | ||
If specifications are not obtained:
- Press → key.
- Check DTC memory → DTC memory (functions 02 and 05), checking and erasing .
If specifications are obtained:
- Press C key.
Work step 7: Diagnosis tank venting system