27B0

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) 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