Misfiring recognition, checking: Notes
Special tools and equipment
- VAS 5051 or VAG 1551
Test sequence
- Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551. Refer to Vehicle diagnostic, testing and information system VAS 5051, connecting and selecting functions , tester and select control module for engine electronics 1 by inserting address word 01. Engine must be running at for this test.
| Rapid data transfer HELP Select function XX |
Indicated on display:
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press Q button to confirm input.
| Read Measuring Value Block Q Input display group number XXX |
Indicated on display:
- Press buttons -0-, -1- and -4- to input "display group number 14" and press Q button to confirm input.
| Read Measuring Value Block 14 → 1 2 3 4 |
Indicated on display:
- Check misfire detection.
| Display zones | ||||
| 1 | 2 | 3 | 4 | |
| Display Group 014: Misfiring recognition | ||||
| Display | xxx/min | xxx % | xxx | --- |
| Indicates | Engine speed | Load | Total No. of misfires | Misfiring recognition |
| Working range |
min.: 550 RPM max.: 7200 RPM |
min.: 0 max.: 100 |
activated blocked |
|
| Specification | 600 to 800 RPM | xx.x % | 0 | activated |
| Note | --- | --- | If readout does not match specification, test misfiring at each cylinder. Refer to Testing misfiring recognition of each cylinder | The misfiring recognition is disabled ("blocked") if misfiring is to be expected due to operational status (such as engine warm-up or overrun shut-off) |
If the specified value is reached:
- Press → button.
| Rapid data transfer HELP Select function XX |
Indicated on display (function selection):