what does P1748 or P1778 mean when its says Duty cycle out of change

2004 SUZUKI FORENZA
73,500 MILES
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TINAWADE
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car is starting to******** sometime
Nov 16, 2011 at 2:51 PM
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RIVERMIKERAT
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My reference doesn't list those codes for Suzuki. Have any sensors or controllers been changed recently?
Nov 17, 2011 at 4:45 AM