Return value, Description – National Instruments CAN 372139B-01 User Manual

Page 214

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Chapter 6

Automotive Diagnostic Command Set API for C

Automotive Diagnostic Command Set User Manual

6-50

ni.com

6

testNotCompletedThisMonitoringCycle

7

warningIndicatorRequested

AddData

contains optional additional data for this DTC. Usually, this does not

contain valid information (refer to

DTCDescriptor

).

len

On input,

len

must contain the

DTCs

array length in elements. On return, it contains the

number of valid elements in the

DTCs

array.

success

Indicates successful receipt of a positive response message for this diagnostic service.

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 reads diagnostic trouble codes by status from the ECU memory. If you set the
optional

groupOfDTC

parameter to the above specified codes, the ECU reports DTCs only

with status information based on the functional group selected by

groupOfDTC

.

For further details about this service, refer to the ISO 14230-3 standard.

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