National Instruments CAN 372139B-01 - Manual (Page 229)

Chapter 6 Automotive Diagnostic Command Set API for C
© National Instruments Corporation 6-65 Automotive Diagnostic Command Set User Manual
Description
This function enables different ECU diagnostic modes. The possible diagnostic modes are not
defined in ISO 14230 and are application specific. A diagnostic session starts only if
communication with the ECU is established. For more details about starting communication,
refer to ISO 14230-2. If no diagnostic session is requested after
ndOpenDiagnostic , a
default session is enabled automatically in the ECU. The default session supports at least the
following services:
• The StopCommunication service (refer to ndCloseDiagnostic and the ISO 14230-2
standard).
• The TesterPresent service (refer to ndTesterPresent and the ISO 14230-3 standard).