27AF

27AF - P1411

Information saved in
DME

Fault code
27AF - P1411

Fault text
Secondary air-injection pump

Fault description


Condition for fault identification
Test condition:
Continuous compliance with secondary air-injection system
conditions
Terminal condition: Engine running
Voltage condition:
ub > K_DIAG_TR_Plus_Min

Condition for fault memory entry
sls_obdh_mdf_max_intg_norm (after 20 sec.) <
KL_Sekund�rluftsystem_OBDH_HFM_DIAG_Min & >
K_Sekund�rluftsystem_OBDH_Sekund�rluftpumpe_DEF or
sls_obdh_mdf_max_intg_norm (after 20 sec.) <
KL_Sekund�rluftsystem_OBDH_HFM_DIAG_Min & <
K_Sekund�rluftsystem_OBDH_Sekund�rluftpumpe_DEF &
exhaust lambda is not higher

Action in service
1. Check wires leading to secondary air-injection pump
2. Check plugs and wiring harness at secondary air-injection
pump
3. If OK, remove secondary air-injection pump relay and
connect the two terminals (30 and 87) in the socket with the
ignition on. If the secondary air-injection pump still fails to
start, it is defective; respond by replacing the secondary air-
injection pump.
4. If secondary air-injection pump starts

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

Driver information
Warning light:
No

Service instruction
none