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



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Procedure 2: 
1. Verify that the device has no 
Current
or 
History
DTCs stored (use $A9 service). 
2. Send a DisableNormalCommunication request message. Keep mode active with Tester present messages 
(mode $3E) for at least 2 minutes. Verify that all Normal Mode communications are disabled. 
3. Stop sending TesterPresent messages and wait P3
Cmax
ms. Verify that normal communications are 
reinitialized. 
4. Verify that the device has no 
Current
or 
History
DTCs stored (use $A9 service). 
Procedure 3: For SPS_TYPE_C ECUs that do not have diagnostic responses enabled. 
1. Send a DisableNormalCommunication functional request with data bytes after the Service Id and verify 
that there is no response from the SPS_TYPE_C ECU. 
2. Next, send a $A2 service request and verify that no response is sent (because a valid $28 service had not 
been received). 
Procedure 4: For SPS_TYPE_B ECUs 
1. Send a valid DisableNormalCommunication request and verify the correct positive response from the 
SPS_TYPE_B ECU. 
8.9.8 Tester Implications. 
Upon receipt of the response to this request, the test device may assume that the 
link will now be quiet for at least P3
C
ms. This mode will be terminated if a TesterPresent ($3E) message is not 
received at least once every P3
C
ms. 
The tester is also responsible to send a ReturnToNormalMode ($20) request (to all nodes) if any single node 
rejects the request for service $28. Otherwise, the device that rejected the $28 service would still be expecting 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 140 of 336 
normal communications traffic while the nodes that accepted the $28 request would quit communicating, 
resulting in erroneous serial data DTCs being set. 
 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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