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

Procedure 4: 
(to be checked only if negative response code $78 is supported by the node).
 
1. Perform step 1 of Procedure 1, then send a ClearDiagnosticInformation ($04) service request message 
and verify the $7F $04 $78 response. After receiving the final positive response, verify that the node is 
capable of performing additional diagnostics by requesting a different diagnostic service and verifying the 
proper response. If the ClearDiagnosticInformation positive response is sent after 1 s (or a maximum value 
specified in the CTS, SSTS, or supplemental diagnostic specification referenced by the CTS or SSTS), 
send a ReadDiagnosticInformation ($A9) service and verify that the status of each DTC has been reset. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 76 of 336 
8.1.8 Tester implications. 
The tester should take into account that it may take the node(s) additional time 
after the positive response to actually complete the clearing of all DTC information. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 77 of 336 
8.2 InitiateDiagnosticOperation ($10) Service. 
This service allows the tester to perform the following tasks: 

Disable the setting of all DTCs while the tool continues to perform other diagnostic services. 

Allow ECU DTC algorithms to continue to execute while the DeviceControl ($AE) service is active. 

Request a gateway ECU to issue a wake-up request.