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Motronic injection and ignition system (4-cyl. turbo) > < Checking Hall sender

A4 Mk1

Motronic Fuel Injection and Ignition System (6-cylinder)
Checking ignition system
Testing misfire detection

Test sequence

  • ‒ Connect vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01
    For this purpose, the engine must be running at idle speed
 
→ When indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Enter "08" to select the function "Reading measured value block" and confirm entry with Q key.
 
→ When indicated on display:
Reading measured value block    Q
Enter display group number XXX
  • ‒ Enter "014" for "display group number 014" and confirm entry with Q key.
 
→ When indicated on display:
Read measured value block 14    ⇒
    1    2    3    4
  • ‒ Check misfire detection in display zones 3 and 4.

Display zones

1

2

3

4

Display group 014: Misfire detection

Display

xxxx rpm

xxx %

xxx

---

Display

Engine speed

Load

Total misfires

Misfire detection

Range

670..6800 rpm

7...100 %

0...10

activated
blocked

Specified value

670...770 rpm 1)
720...820 rpm2)
630...730 rpm3)

12...26 %

0

activated

Note

If nominal value is exceeded: Check misfire of the individual cylinders => Page 28-54.

In certain operating status e.g. in overrun the misfire recognition is blocked

1)    2.4 litre front and four-wheel drive 2) 2.8 litre front wheel drive 3) 2.8 litre four-wheel drive

If specified value is attained:

  • ‒ Press ⇒key.
 
→ Indicated on display (function selection):
Rapid data transfer     HELP
Select function XX

If specified value is not attained:

  • ‒ Press C key.

Check misfire detection of the individual cylinder
 
→ When indicated on display:
Reading measured value block    Q
Enter display group number XXX
  • ‒ Enter "015" for "display group number 015" and confirm entry with Q key.
 
→ Display readout:
Read measured value block 15    ⇒
    1    2    3    4
  • ‒ Check misfire detection in display zones 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

0...5

0...5

0...5

activated
blocked

Specified value

0

0

0

activated

Note

If nominal value is exceeded: Evaluation => Page 28-56

---
  • ‒ Press C key.
 
→ When indicated on display:
Reading measured value block    Q
Enter display group number XXX
  • ‒ Enter "014" for "display group number 014" and confirm entry with Q key.
 
→ Display readout:
Read measured value block 16    ⇒
    1    2    3    4
  • ‒ Check misfire detection in display zones 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

0...5

0...5

0...5

activated
blocked

Specified value

0

0

0

activated

Note

If nominal value is exceeded: Evaluation => Page 28-56

---

Evaluation display group 014, display zone 3 and display groups 015 and 016, display zones 1, 2 and 3

Indicated on display

Possible causes of fault

Fault remedy

Higher than 15

- Defective spark plug
- Defective spark plug connector
- Ignition coil or output stage defective

- Check spark plugs and ignition wiring with connectors
Check ignition coils and output stages

- Injector defective

- Check injectors => Page 24-40

- Poor compression on one or more cylinders

- Check compression:

Motronic injection and ignition system (4-cyl. turbo) > < Checking Hall sender