SL 600 (230.477) V12-5.5L Turbo (275.954) (2007)
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This condition may be caused by a malfunctioning check valve in the vacuum line (Figure 1) to the air pump switch over valve. When the check valve
malfunctions, vacuum flow to the diverter valve is restricted preventing it from opening. Proceed as follows.
2.1 Test the secondary air injection function chain with SDS.
2.2 If the air pump can be activated with SDS but the function chain test fails, the vacuum flow between the air pump switchover valve and the diverter
valve may be restricted preventing the diverter valve from opening.
2.3 Check vacuum supply (Figure 2) at the diverter valve. If vacuum is < 500mbar, change check valve.
Note:
Copy of the SDS short test and all tests performed must accompany returned parts. If the documentation is missing or does not support the diagnosis, the
warranty claim may be debited.
Note:
When ordering a replacement relay order the part number of the relay being removed. The parts system will deliver the current version of the ordered
part.