Camaro, Firebird, 1999 - 2002

Diagnostic Trouble Code Display

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The Scan Tool can display up to five DTC options of enhanced code data on GM Vehicles They are DTC Info, Specific DTC, Freeze Frame, Fail Records (not used on all applications) and Clear Info.

Conditions: To Clear Diagnostic Trouble Codes



Here are 3 methods for clearing codes from the PCM memory:



Use the Scan Tool (also clears Freeze Frame & Failure Records)
 
If battery power to the PCM is removed (battery cable or PCM fuse), all current data (DTC, Freeze Frame, Fail Records, Statistical Filters and I/M Readiness Flags) will be cleared
 
If the fault that caused a DTC to set has been corrected, the PCM will begin to count warmup cycles. Once it has counted 40 warmup cycles with no further faults detected, the DTC is cleared
 

DTC Info Mode



This mode is used to search for a specific type of stored DTC information. There are seven different selections. The repair charts may instruct the technician to test for a DTC in a particular manner.



History
 
MIL Request
 
Last Test Fail
 
Test Fail Since Codes Cleared
 
Not Run Since Codes Cleared
 
Fail This Ignition
 
DTC Status
 

Specific DTC Mode



In this Mode, the PCM checks the status of individual diagnostic tests by their DTC number. This selection can be accessed if a DTC has passed, failed or a combination of both. Some of the individual DTC tests that are available on the Scan Tool are shown below:



Failed Last Test
 
Failed Since Clear
 
Failed This Ignition
 
History DTC
 
MIL Requested
 
Not Run Since Clear
 
Not Run This Ignition
 
Test Ran and Passed
 

 
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