Misfire detection, checking
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Special tools and equipment
- VAS5051 with VAS5051/1
Test sequence
- Connect testing and information system VAS5051. Refer to Vehicle diagnostic, testing and information system VAS5051, connecting and select functions and select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed.
| 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: Misfire detection | ||||
| Display | xxx RPM | xxx% | xxx | --- |
| Display | Engine speed | Load | Total misfires | Misfire detection |
| Range | min.: 550 RPM max.: 7200 RPM |
min.: 0 max.: 100 |
Activated not activated |
|
| Specif. value | 600 to 820 RPM | xx.x% | 0 to 5 | Activated |
| Note: | --- | --- | If the specified value is not reached: Evaluation display field 3. Refer to Evaluating display groups 014, 015 and 016, Display field 3: . | --- |
If the specified value is reached:
- Press → button.
| Rapid data transfer HELP Select function XX |
Indicated on display (function selection):
If specified value is not attained:
- To change to display group 015, press s button.
Checking misfire recognition of the individual cylinder
Display on VAS5051:
- Check indication in display fields -1- to -4-.
| Display zones | ||||
| 1 | 2 | 3 | 4 | |
| Display group 015: Misfire detection of cylinders 1, 2 and 3 | ||||
| Display | xxx | xxx | xxx | --- |
| Display | Number of misfires in cylinder 1 | Number of misfires in cylinder 2 | Number of misfires in cylinder 3 | Misfire detection |
| Range | Activated Blocked |
|||
| Specif. value | 0 | 0 | 0 | Activated |
| Note: | If nominal value is exceeded: Evaluation. Refer to Evaluating display groups 014, 015 and 016, Display field 3: | --- | ||
- To change to display group 016, press s button.
Display on VAS5051:
- Check indication in display fields -1- to -4-.
| Display zones | ||||
| 1 | 2 | 3 | 4 | |
| Display group 016: Misfire detection of cylinders 4, 5 and 6 | ||||
| Display | xxx | xxx | xxx | --- |
| Display | Number of misfires in cylinder 4 | Number of misfires in cylinder 5 | Number of misfires in cylinder 6 | Misfire detection |
| Range | Activated Blocked |
|||
| Specif. value | 0 | 0 | 0 | Activated |
| Note: | If nominal value is exceeded: Evaluation. Refer to Evaluating display groups 014, 015 and 016, Display field 3: | --- | ||
- Exit function "08 - Read measured value block" by pressing ← button.
Evaluating display groups 014, 015 and 016, Display field 3:
| Display field: 3 | Possible cause | Corrective action |
| Greater than 5 |
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