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


Type B DTCs (Figures E10, E11, and E12)



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Type B DTCs (Figures E10, E11, and E12): 
The ECU illuminates the malfunction indicator lamp (MIL) 
when the diagnostic runs and fails during 2 or 3 consecutive trips, depending on the regional requirements. 
The first failure will cause the current status bit to be set, but the history and warning indicator requested 
status bits do not set unless the diagnostic runs and fails during 2 or 3 consecutive trips. 

Type C DTCs (Figures E13 and E14):
The ECU stores the DTC information into memory when the 
diagnostic runs and fails. Type C DTCs do not illuminate the malfunction indicator lamp (MIL) but may 
cause another indicator to illuminate. 
DTC information includes the base DTC (two bytes), failure type byte, status byte, freeze frame data (emission 
related ECUs only), failure record information, and other data such as flags, counters, timers, etc., specific to 
the DTC. This information has limited duration usefulness. An automatic clearing of DTC information function is 
implemented in order to avoid reporting out of date information. For Non-Powertrain ECUs, all DTCs are 
cleared at the same time. This means that the timing of the automatic clearing of DTCs is based upon the most 
recently detected DTC. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 321 of 336 

Automatic Clearing of DTCs (Figure E15): 
Automatic clearing of DTC Information is clearing all DTCs in 
the ECU memory after a predetermined number of consecutive ignition on/off cycles with no test fail result. 
The typical number of fault free ignition cycles is 40. 
Figure E1: Non-Latching DTC (1 of 2) 

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