Special tools, testers and auxiliary items
WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- VAG1551 or VAG1552 Scan Tool (ST)
- VAG1551/3 adapter cable
- VAG1397A turbocharger tester
- VAG1598/18 test box
- Multimeter (Fluke 83 or equivalent)
- VW1594 connector test kit
- Connect VAG1551 or VAG1552 scan tool
- Start engine and let idle.
- Press buttons -0- and -1- to insert the "Engine Electronics" address word 01.
NOTE:
To check boost pressure control, it is essential that boost pressure first be measured without the influence of pressure limiting (control).
- Measure boost pressure using VAG1551 scan tool during a test drive.CAUTION: When "on the road" measurements are required for diagnosis, for obvious safety reasons, always use a second technician to take the instrument readings.
- Ensure that wastegate bypass regulator valve - N75- harness connector is connected.
- Connect VAG1551 or VAG1552 scan tool.
- Start engine and let idle.
- Press buttons -0- and -1- to insert the "Engine Electronics" address word 01.
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
- Press -Q- button to confirm input.
Indicated on display
- Press buttons -0-, -1- and -1- to input display group no. 11 (011).
- Press -Q- button to confirm input.
- Indicated on display
- Accelerate vehicle in 3rd gear from about 1500 RPM using wide open throttle.
- Press "PRINT" button on VAG1551 at about 3000 RPM.
Specification: 1720 to 1950 mbar (display field 3)
If measured boost pressure is too low:
- Check wastegate bypass regulator valve.