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

 
extended address, and 
shall not 
respond
to any diagnostic request until diagnostic responses are enabled. 
Note:
Reference the Diagnostic CANId section of this specification for more information on the AllNode 
request CANId and the AllNode extended address. 
An SPS_TYPE_C ECU shall enable diagnostic responses after receiving a request for this diagnostic service 
while the DisableNormalCommunication ($28) service is active. The SPS_TYPE_C ECU shall respond to the 
request for this service using the SPS_PrimeRsp CANId. The SPS_PrimeRsp CANId is a special case 
diagnostic response CANId in the format of 3xx, where the xx is the diagnostic address of the ECU. 
Note:
Refer to Appendix D of this specification for more information on Diagnostic Addresses. 
Once diagnostic responses are enabled, the SPS_TYPE_C ECU shall continue to accept diagnostic requests 
using the AllNode CANId with the AllNode extended address, or the SPS_PrimeReq CANId. The 
SPS_PrimeReq CANId is a special case diagnostic request CANId with the format 0xx, where xx is the 
diagnostic address of the ECU. All subsequent diagnostic responses to requests using the SPS_PrimeReq 
CANId or the AllNode request CANId with AllNode extended address shall be transmitted using the 
SPS_PrimeRsp CANId. The SPS_PrimeReq and SPS_PrimeRsp CAN Identifiers shall be available for use 
until a ReturnToNormalMode ($20) request is received or a P3
C
(TesterPresent) timeout occurs. If a $20 
request is received or a P3
C
timeout occurs before the ECU is completely programmed, an SPS_TYPE_C 
ECU shall once again disable diagnostic responses and disable the SPS_PrimeReq and SPS_PrimeRsp CAN 
Identifiers. 
Note: 
An SPS_TYPE_C ECU shall not send a mode $20 response if it receives a mode $20 request message 
or a when a TesterPresent timeout occurs during the phase when the SPS_PrimeReq and SPS_PrimeRsp 
CAN identifiers are enabled. Reference the pseudo code of service $20 for more details.
 
SPS_TYPE_A and SPS_TYPE_B ECUs shall use their permanent diagnostic CAN Identifiers for receiving and 
responding to requests for this diagnostic service. 
If a programmable node receives a $A2 request, it will report to the tester its current state of programming as 
follows: 

That a memory error has been detected. The memory error could indicate a problem with RAM or 
permanent memory (e.g., EEPROM or Flash, potentially including the boot memory). 

That it is has only boot software present (without operational software and without calibration data). 

That it has boot software and operational software but without calibration data. 

That it has boot software, operational software, and calibration data present but the calibration data is a 
defaulted and programming needs to be performed. 

That it is fully programmed with both operational software and calibration data. 
Note:
A defaulted calibration set may be used if vehicle assembly plant operations require some module 
functionality at a point in the build process prior to the point where the ECU would be programmed. Default 
calibrations may also be present in the ECU when delivered to service. For example an engine controller may 
have a no start calibration when delivered to service. 
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