National Instruments CAN 372139B-01 - Manual (Page 231)

Chapter 6 Automotive Diagnostic Command Set API for C
© National Instruments Corporation 6-67 Automotive Diagnostic Command Set User Manual
Return Value
The return value indicates the function call status as a signed 32-bit integer. Zero means the
function executed successfully. A negative value specifies an error, which means the function
did not perform the expected behavior. A positive value specifies a warning, which means the
function performed as expected, but a condition arose that may require attention.
Use the ndStatusToString function to obtain a descriptive string for the return value.
Description
This function starts a routine in the ECU memory. The ECU routine starts after the positive
response message is sent. The routine stops until the
ndStopRoutineByLocalIdentifier
function and corresponding service are issued. The routines could be either tests that run
instead of normal operating code or routines enabled and executed with the normal operating
code running. In the first case, you may need to switch the ECU to a specific diagnostic mode
using
ndOpenDiagnostic or unlock the ECU using the SecurityAccess service prior to
using ndStartRoutineByLocalIdentifier .
For further details about this service, refer to the ISO 14230-3 standard.