Misfiring Detection, Checking

Misfiring detection, checking

Special tools, testers, measuring instruments and auxiliary items required

- VAG 1551/1552 Scan Tool with VAG 1551/3 cable

Test sequence

- Connect VAG 1551/1552 Scan Tool, [1][2][3]Reading and Clearing Diagnostic Trouble Codes.
- Start engine and let idle
- Press 0 and 1 buttons to select Address word 01: "Engine electronics"

Display will appear as shown:

Rapid data transfer HELP
Select function XX

- Press 0 and 8 buttons to select Function 08: "Read measuring value blocks
- Press Q button to enter input

Display will appear as shown:

Read measured value block HELP
Input display group number XXX

- Press 0, 1 and 4 buttons to select "Display group 014"
- Press Q button to enter input

Display will appear as shown (1 to 4 = Display zones)

Read measured value block 14 ->
1 2 3 4

- Check specification for misfire detection (display zones 3 to 4):







NOTE:

If DTC memory has been erased or the Engine Control Module was disconnected from its Voltage supply, the Readiness Code must be created again, Refer to "Computers and Control Systems" under "Testing and Inspection", Monitors, Trips, Drive Cycles and Readiness Codes.

If specification is attained:
- Press -> button.
- Press 0 and 6 buttons to select Function 06: "End data transfer"
- Press Q button to enter input

If specifications are not obtained:
- Press C button.
- Press 0, 1 and 5 buttons to select "Display group 015"
- Press Q button to enter input

Display will appear as shown: (1 to 4 = Display zones)

Read measured value block 15 ->
1 2 3 4

- Check specification for misfire detection (display zones 1 to 4):







If specification attained:
- Press C button.
- Press 0, 1 and 6 buttons to select "Display group 016"
- Press Q button to enter input

Display will appear as shown: (1 to 4 = Display zones)

Read measured value block 16 ->
1 2 3 4

- Check specification for misfire recognition, display zones 1 and 4







Evaluating display groups 15 and 16