27C5

27C5 - P2430

Information saved in
DME

Fault code
27C5 - P2430

Fault text
Secondary air-injection system mini-HFM plausibility

Fault description


Condition for fault identification
Test condition:
Consistent compliance with secondary air-injection system
conditions
Secondary air-injection system in operation for at least 10
sec.
Terminal condition: Engine running
Voltage condition:
ub > K_DIAG_TR_Plus_Min

Condition for fault memory entry
sls_obd_max after 10 sec. operation under
KL_Sekund�rluftsystem_OBD_HFM_DIAG_Min
or after 20 sec. secondary air-injection system operation
sls_obdh_mdf_max_intg_norm <
K_Sekund�rluftsystem_OBDH_EUV_Min_DEF and
exhaust-gas lambda increased

Action in service
1. Disconnect secondary air-injection line from secondary
air-injection pump output
2. Conduct system test
3. If secondary air-injection pump runs and air emerges, but
a DTC is still entered, replace the mini-HFM

Fault effect and breakdown warning
MIL is on after 2x engine cold start

Driver information
Warning light:
No

Service instruction
none