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Testing intake manifold changeover function
Testing operation
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‒ Run engine at idling speed for 2 or 3 minutes (to build up a vacuum).
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‒ With car stationary and ignition switched on, start final control diagnosis and select intake manifold changeover valve -N156 .
The vacuum unit for the intake manifold changeover valve should pull and release alternately.
If the changeover is not taking place, carry out the following tests:
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‒ Test intake manifold changeover valve -N156 (perform final control diagnosis ).
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‒ Make sure that vacuum hoses are properly connected and free of blockages and leaks.
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‒ Make sure that the changeover mechanism can move freely (actuate linkage by hand).
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