Condition For Fault Memory Entry - Ionic Current

2B49 - P0308

Information saved in
DME

Fault code
2B49 - P0308

Fault text
Combustion miss with deterioration of emissions in Cyl. No.
8

Fault description


Condition for fault identification
Test condition:
Engine runs, no shunt current, no ignition miss, injection
enabled, ignition enabled, engine speed >
K_AUSS_OBD_N_Min and < K_AUSS_OBD_N_Max
relative induction charge density >
KL_AUSS_OBD_RF_Min(n) no dynamic response, no dual
ignition
Terminal condition: Terminal 15
Voltage condition:
none

Condition for fault memory entry
Ionic current integral in miss window less than a load and
rpm-dependent threshold

Action in service
1. Note additional error memory entries. Misses can also be
collateral malfunctions?
2. Replace spark plug.
3. Interchange ignition coil with other coil to localize
malfunction, replace as indicated.
4. Run compression check.
5. Check fuel supply.
6. Check plug and wiring harness.

Fault effect and breakdown warning
Rough idle / engine rpm limitation displayed / reduced
power / Check Control message / MIL after engine runs 2x

Driver information
Warning light:
No

Service instruction
none