Work sequence
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- 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: