GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Important: Before clearing any DTCs, use the scan tool Capture Info to save freeze frame and failure records for reference. The control module's data is deleted once the Clear Info function is used..

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Important: The new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Is the action complete?

--

Go to Step 3

--

3

  1. Using the scan tool, clear the DTCs.
  2. Start the engine.
  3. Allow the engine to idle unitl the normal operating temperature is reached.
  4. Select the DTC and the Specific DTC functions.
  5. Enter the DTC number that was set.
  6. Operate the vehicle within the conditions for setting this DTC until the scan tool indicates the diagnostic Ran.

Does the scan tool indicate the diagnostic Passed?

--

Go to Step 4

Go to Step 2

4

Does the scan tool display any additional, undiagnosed DTCs?

--

Go to the Applicable DTC Table

System OK