MSS60 Error: 27B0, P0491

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27B0 - P0491

Information saved in DME
Fault code 27B0 - P0491
Fault text Secondary air system flow rate, bank 1
Fault description Secondary Air Injection System Insufficient Flow (Bank 1)
Condition for fault identification Test condition: sls_obdh_mdf_max_intg_norm (after roughly 30s)<K_SLS_OBDH_MDF_MIN_DEF and
sls_obdh_lam_asv_intg_norm < k_SLS_OBDH_MDF_2_MAG or
sls_obdh_lam_asv_intg_norm < k_SLS_OBDH_ASV_LI_OPE and K_SLS_OBDH_MDF_MIN_DEF>K_SLS_OBDH_MDF_MAX_DEF
Terminal condition: Engine running
Voltage condition: Battery voltage > 10.8 V (k_sls_obd_ub_min)
Condition for fault memory entry 30000 ms
Action in service 1. Disconnect secondary air line
2. Carry out test routine
3. If flow is too high, replace the ASV
4. Otherwise check Line 1 for obstructions and replace as indicated
Fault effect and breakdown warning MIL is on after 2x engine cold start
Driver information Warning light: MIL
Service instruction None