Road test procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Avoid deceleration fuel cut-off during this diagnostic test. It causes the three way catalytic converter to store oxygen, diagnostic test will then be blocked for at least 10 seconds.
- Transmission Range 2 or 2nd gear must be selected
- Engine speed must be kept between 2500 and 4000 RPM
- Continue test drive until specifications are attained
- Check specifications during test drive (second technician necessary).
See airbag warning, see TEST SEQUENCE .
- Continue test drive until all specifications are obtained.
DISPLAY GROUP: 125, FUNCTION: 04
| Display fields | ||||
|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |
| Display group: 125, Function: 04 | ||||
| Display | xxxx rpm | xx.x % | xx.x % | xxxx xxxx |
| Indicated | Engine speed | O2S adaptation at partial throttle | O2S adaptation at idle | Diagnostic conditions |
| Specification | 2500 to 3500 rpm Depending upon driving condition |
-10 to 10 % | -12.4 to 12.4 % | x1x1 xxxx x = Not relevant |
| Working range | 650 to 5500 rpm | -25 to 25 % | -12.4 to 12.4 % | |
RELEVANCE OF 8 DIGIT NUMBER BLOCK IN DISPLAY FIELD 4
| Relevance of 8 digit number block in display field 4 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Specifications of diagnostic conditions |
| 1 | Partial throttle adaptation active | |||||||
| 1 | O2S control before three way catalytic converter active | |||||||