Purpose

Executes the WWH-OBD ReadDTCInformation service. Reads selected Diagnostic Trouble Codes (DTCs).

Format 

        long ndWWHOBDRequestFreezeFrameInformation (
       TD1 *diagRef,
       unsigned char DTCMaskRecord[],
       long lenDTCMaskRecord,
       unsigned char DTCRecordNumber,
       unsigned char dataOut[],
       long *len,
       LVBoolean *success);

Input

diagRef

Specifies the diagnostic session handle, obtained from ndOpenDiagnosticOnCANFD and passed to subsequent diagnostic functions. Normally, it is not necessary to manually manipulate the elements of this struct.

DTCMaskRecord

Specifies the DTC mask record.

lenDTCMaskRecord

Contains the number of valid data bytes in the DTCMaskRecord array.

DTCRecordNumber

Specifies the snapshot record number. Output

dataOut

Returns the ECU data record.

len

On input, len must contain the dataOut array length. On return, it contains the number of valid elements in the dataOut 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

The WWH-OBD ReadDTCInformation service is based on the UDS ReaDTCInformation service (ISO 14229-1).