OBD and secondary air system
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Information on diagnostics
Malfunctions and faults within the secondary air system can be identified using an on-board diagnostic system (OBD). The diagnostic trouble codes P0410, P0411, P0412, P0415, P0413, P0416, P0414, P0417, P0418 and P0419 indicate faults in the secondary air system. You can find out which components are affected by the different diagnostic trouble codes and how you can check them here.
| PIERBURG PRODUCTS | ON-BOARD DIAGNOSTICS |
| 01 Secondary air valve (electrical) | 06 Engine control unit |
| 02 Secondary air pump (SLP) | 07 Malfunction indicator lamp (MIL) |
| 03 Lambda sensor | 08 Diagnostic plug |
| 04 Secondary air valve (pneumatic) | 09 OBD data scan tool |
| 05 Switchover valve (EUV) |
FROM PRACTICAL USE
FINDING AND REMEDYING FAULTS
| DIAGNOSTIC TROUBLE CODE | P0410 | P0411 | P0412, P0415 |
| DISPLAYED FAULTS | Secondary air system – malfunction No detection of secondary air by lambda sensor (no lean signal) |
Secondary air system – insufficient quantity The secondary air rate detected is too low (insufficient lean signal) |
Secondary air on-off valve A (EUV 1) / B (EUV 2) electrical fault The switchover valve (EUV) does not activate |
| NEXT STEPS/ POSSIBLE REMEDIES |
• Secondary air pump may be defective. Check SLP, relays, lines and plug-in connections • If there is condensate in SLP: Check the secondary air valve for tightness and the switchover valve for functioning • Check the non-return valve – replace if soiled • If there is water in SLP: Check the vacuum line and valves for tightness |
• Check the function of the switchable non-return valve with vacuum hand pump • Check the switchover valve and the vacuum line • Check the non-return valve and secondary air lines for free flow |
• Check lines, plug-in connections and electric switchover valve |
| DIAGNOSTIC TROUBLE CODE | P0413, P0416 | P0414, P0417 | P0418, P0419 |
| DISPLAYED FAULTS | Secondary air on-off valve A (EUV 1) / B (EUV 2) interruption The switchover valve (EUV) does not activate |
Secondary air on-off valve A (EUV 1) / B (EUV 2) short circuit The switchover valve (EUV) does not activate |
Secondary air system relay circuit A / circuit B malfunction Secondary air pump relay A or B does not activate |
| NEXT STEPS/ POSSIBLE REMEDIES |
• Check lines, plug-in connections and electric switchover valve |
• Actuation of switchover valve (EUV) not OK • Check lines, plug-in connections and electric switchover valve |
• Check relays, lines, plug-in connections and secondary air pump |
