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| Fuse for secondary air pump relay - J299--arrow- in main fuse box on battery o.k. |
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| Secondary air pump relay -J299- is o.k. |
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| Intake hose for secondary air pump is not blocked or kinked. |
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| Remove pressure hose guided from the secondary air pump to the combination valve. |
| The secondary air pump must start at intervals and air must flow out at the outlet connection. |
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| If the pump does not start, check the voltage supply of the pump. |
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| Disconnect the 2-pin plug at the secondary air pump and connect the multimeter for measuring the voltages. |
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| Actuate the secondary air pump relay via the final control diagnosis. |
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| Specified value: alternately 0...12V in switching rhythm of the pump relay. |
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| If the specified value is not reached, check wiring according to the current flow diagram. |
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| If the nominal value is reached, replace the secondary air pump. |
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