Work sequence
WARNING: This page is about a different variant/trim than selected.
- Connect V.A.G 1551/1552 (Connecting scan tool and selecting engine electronics control module → Scan Tool V.A.G 1551 , connecting .)
- Run engine at idle speed and press buttons - 0 - and - 1 - to select "Engine electronics" address word 01.
CAUTION:
Secure Scan Tool to rear seat and operate from this position (second technician required).
Indicated on display
| Rapid data transfer HELP Select function XX |
- Press buttons - 0 - and - 8 - to select "Read measured value block" and confirm entry with - Q - button.
Indicated on display
| Read measured value block HELP Input display group number XXX |
- Press buttons - 0 - , - 1 - and - 0 - to select "Display group number 10" and confirm entry with - Q - button.
- Observe display in display field 1.
| Read measured value block 10 -> 309 mg/H 1027 mbar 1011 mbar 0.0 % |
- Specification: 230 to 370 mg/H
If specification is not obtained:
- Check exhaust gas recirculation system: → 26 - EXHAUST SYSTEM, EMISSION CONTROLS
If specification is obtained:
- Road test vehicle with a 2nd technician to observe display.
Observe valid safety precautions when road testing → Safety precautions .
- Accelerate vehicle in 3rd gear (vehicles with manual transmission) or 2nd gear (vehicles with automatic transmission) from about 1500 rpm using wide open throttle.
- Press PRINT button on V.A.G 1551 at approx. 3000 rpm.
- Specification in display field 4: 100 % (accelerator pedal position)
| Read measured value block 10 -> 830 mg/H 1027 mbar 1850 mbar 100 % |
If specification is not obtained:
- Repeat test and accelerate vehicle at wide open throttle.
- Specification in display field 1: above 800 mg/H (mass of air drawn in).
| Read measured value block 10 -> 830 mg/H 1027 mbar 1850 mbar 100 % |
- Press → button.
- Press buttons - 0 - and - 6 - to select "End output" function 06 and confirm entry with - Q - button.
- Switch ignition off.
If specification is not obtained:
- Replace MAF Sensor G70.
- Check DTC memory and, if necessary, repair any malfunctions and then erase → Diagnostic Trouble Code (DTC) memory, checking and erasing .
- Read readiness code → Readiness code, displaying .
If DTC memory has been erased, the readiness code must be generated again → Readiness code, setting .
If a constant 550 mg/H (predetermined replacement value) is displayed in field 1: