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

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 75 of 336 
send Negative Response ($7F $04 $78) /* RequestCorrectlyReceived-ResponsePending */ 
Clear DTC status information to be used by $A9 service
Clear Freeze Frame and Failure Record DTC Data
Reset any DTC related timers, flags, counters, etc. 
send ($44) response 
ELSE 
send ($44) response
Clear DTC status information to be used by $A9 service 
Clear Freeze Frame and Failure Record DTC Data 
Reset any DTC related timers, flags, counters, etc. 
ENDIF 
ENDIF 
ENDIF 
ENDFUNCTION 
8.1.7 Node Verification Procedure. 
Procedure 1: 
1. Create various normal operating conditions as well as fault conditions which allow on-board diagnostic 
routines to execute (thus resulting in changes to the supported status bits of each supported DTC). Verify 
the status of each supported DTC via the ReadDiagnosticInformation ($A9) service. Continue to exercise 
the component (including creating fault conditions) to allow all supported status bits for all DTCs to change 
from their power on initialization value. If a device supports freeze frame or failure record data, verify that 
freeze frame and or failure record data is present in the node. (Use ReadFailureRecordData ($12) service 
to verify freeze frames and/or failure record data is present in the node.) 
2. Send a ClearDiagnosticInformation ($04) service request and verify the positive response. 
3. Wait 1 s (or the time value specified in a CTS, SSTS, or supplemental diagnostic specification referenced 
by one of the preceding documents) and then read the status of DTCs with the $A9 service. Verify that the 
appropriate status flags have reset. 
Note:
It is possible that some DTC algorithms may execute within the 1 s wait time described in this 
procedure. This must be taken into account when verifying that the status bits reset. 
Procedure 2: 
1. If certain operating conditions can exist which would inhibit a diagnostic information reset, then place the 
device in those conditions. 
2. Use the ReadDiagnosticInformation ($A9) service to verify the status of all DTCs. 
3. Send a ClearDiagnosticInformation ($04) service request, verify negative response ($7F $04 $22). 
4. Use the ReadDiagnosticInformation ($A9) service to verify the status of all DTCs. Verify that the DTC 
status bits have NOT been reset. 
Procedure 3: 
1. Use the ReadDiagnosticInformation ($A9) service to verify the status of all DTCs. 
2. Send a ClearDiagnosticInformation ($04) service request with extra data bytes and verify negative 
response ($7F $04 $12). 
3. Use the ReadDiagnosticInformation ($A9) service to verify the status of all DTCs. Verify that the DTC 
status bits have NOT been reset.