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Automobile User Manual

ManualsBrandsNational Instruments ManualsAutomobileCAN 372139B-01
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Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-110 ni.com
The TesterPresent service is this “keep alive” signal. It does not affect any other ECU
operation.
Keep calling
ndUDSTesterPresent within the ECU timeout period if no other service is
executed.