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

InitiateDiagnosticOperation ($10)
request with a sub-parameter value of
$02 
(disableAllDTCs)
using the AllNodes request CANId and the AllNodes extended address. 

This step ensures that nodes that poll the CAN controller do not set DTCs if they do not process 
the mode $28 request (in the next step) before they could possibly set signal supervision 
failures. 
17 
Send a 
DisableNormalCommunication ($28)
request (with AllNodes CANId and AllNodes 
extended address - on each link as needed). 

This disables sending and processing of normal mode data. 

An SPS_TYPE_C ECU does not respond to a $28 request but tracks receipt of the $28 request 
(in order to enable diagnostic responses after receiving the $A2 service later in the process). 

The tester shall not enable diagnostic responses (via mode $A2) in SPS_TYPE_C ECUs until 
after it has received positive responses to the $28 request from all other ECUs on the link (as 
stored in the diagnostic configuration matrix). 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
CameraLoops.com

---

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 276 of 336 
Step 
Action 
18 
Determine which nodes are programmable using the service 
ReportProgrammedState ($A2)
with 
the AllNodes CANId and AllNodes extended address (finalization of the diagnostic configuration 
matrix - on each link as needed). 

Each programmable ECU shall respond. 

SPS_TYPE_A and SPS_TYPE_B ECUs respond with their permanent diagnostic USDT 
response CANId (which falls within the reserved range of diagnostic response CAN Identifiers).

An SPS_TYPE_C ECU responds with its SPS_PrimeRsp CANId ($3xx where xx = ECU 
diagnostic address). 

At this point the SPS_TYPE_C ECU would activate and accept the SPS_PrimeReq ($0xx) 
CANId as a diagnostic PTP request CANId (where xx = diagnostic address). 

MSSC ECUs shall only respond to the $A2 service on the subnet where they support 
programming (MSSC ECUs shall only be programmable on one subnet - see 4.3.4.) 
19 
optional 
step 
Verify that the tester is connected to the correct vehicle - the same vehicle from which the seed was 
retrieved (e.g., use the service