General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

PID_Found 
This is a flag used to determine if a requested PID has been found in the list of 
supported PIDs. 
YES/NO 
PIDs_Supported[] 
This is an array of data structures that contains the list of supported PIDs and the 
length of the data for each supported PID. PIDs_Supported[].PID_Number is 
used in the pseudo code when checking the PID number to see if it is supported. 
PIDs_Supported[].length is the number of data bytes associated with the given 
PID.
 
N/A 
Supported_Dyn_DPIDs[] 
This is an array that contains all of the supported dynamically definable DPID 
numbers.
 
N/A 
max_Dynamic_DPID_Index 
This is a constant that is used when indexing through the array of supported 
dynamic DPIDs to determine if a DPID is supported. Its value is equal to 1 less 
than the number of DPIDs supported by the ECU.
 
constant determined at 
compile time 
DPID_Index 
This is a local index variable used when indexing through the array of supported 
dynamic DPIDs to determine if the DPID from the request message is valid. 
0 to 
max_Dynamic_DPID_Index 
PidStructArray[] 
This is an array of structures that contain the data needed to support PIDs. for 
the purposes of the pseudo code of this service it is assumed that each structure 
contains the following information: 
1. PidSecure - Set to YES if security access is required to retrieve PID data 
2. PidSecurityCode 
– Set to YES if security code access is required to retrieve 
PID data 
Other elements may exist in the structure such as a pointer to a function to 
retrieve the data, memory address and length information (for a dynamic PID, 
see $2D service), etc. Only the PidSecure and PidSecurityCode are shown here 
for the purposes of the pseudo code. 
The pseudo code uses the following convention to access an element of the 
structure: 
PidStructArray[0].PidSecure would indicate if security access is required for the 
first PID structure in the array.
 
N/A 
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