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

8.15.8 Tester Implications. 
The TesterPresent ($3E) request message shall be sent at least once every P3
C
ms. It is recommended that the tester sends a TesterPresent request message at an interval of less than ½ of 
P3
C
. It is the tester
’s responsibility to ensure that this message is received by the device under test. The tester 
should take into account bus traffic and message priority in scheduling this message. 
 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 179 of 336 
8.16 ReportProgrammedState ($A2) Service. 
The reportProgrammedState is used by the tester to 
determine: 

Which nodes on the link are programmable. 

The current programmed state of each programmable node. 
8.16.1 Service Description. 
Upon boot up, a programmable node checks for the presence of valid operational 
software and calibrations, and for any possible memory faults. If any portion of the operational software or 
calibration data (which is programmed via the Service Programming System) is missing or invalid, then the 
node is considered to be an SPS_TYPE_B (if permanent diagnostic CAN Identifiers are stored in the ECU) or 
SPS_TYPE_C (if permanent diagnostic CAN Identifiers are not stored within the ECU) ECU. SPS_TYPE_B 
and SPS_TYPE_C ECUs shall disable normal communication messages.
SPS_TYPE_A (fully programmed SPS ECU) and SPS_TYPE_B ECUs can respond to all of the diagnostic 
requests for the services that it supports. SPS_TYPE_C ECUs shall only be able to process diagnostic 
requests which are sent using the AllNode request CANId with the AllNode