| CHECK SECONDARY AIR COMBINATION VALVE. |
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1) Remove the secondary air combination valve. 2) Blow in air from the secondary air combination valve air inlet, and check whether there are leaks at the pipe connections. |
| QUESTION | |
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Are there air leaks from the pipe connections? | |
| Yes | No |
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Replace the secondary air combination valve on the side with the air leak. |
Temporary poor contact occurs. Check the poor contact of connector. |