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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  This step ensures that the scan tool is getting power.
  2. 2:  This step ensures that the scan tool is communicating to the powertrain control module (PCM) or the engine control module (ECM).
  3. 3:  This step ensures that the PCM or ECM has the latest calibrations.
  4. 6:  This step checks to see if any related diagnostic trouble codes (DTCs) should be diagnosed first.
  5. 9:  This step checks to see if the customer concern is with Inspection/Maintenance (I/M) testing.
Diagnostic System Check - Manual Transmission

Step Action Yes No
1 
    IMPORTANT:
    • Search for applicable bulletins before proceeding with the diagnosis.
    • Do not turn OFF the ignition when performing this diagnostic table.
    • Do NOT clear the DTCs unless the diagnostic instructs you to do so.
  1. Connect a scan tool to the data link connector (DLC).
  2. Turn ON the ignition, with the engine OFF.
Does the scan tool power-up?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2  Does the scan tool display the PCM/ECM data? Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
3  Does the PCM/ECM require a calibration update? Go to Step 11  Go to Step 4 
4 Does the scan tool display any PCM DTCs? Go to Step 5  Go to Step 8 
5 Record the Freeze Frame and Failure Records information with the scan tool.
Did you complete the action?		 Go to Step 6  -
6  Were there any engine control DTCs P0601, P0602, P0604, P0606, or any engine electrical DTCs P0562, P0563, P1637, P1638? Go to DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls - 6.6L or DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls - 8.1L Go to Diagnostic Trouble Code (DTC) List in Engine Electrical
7 Was the DTC a P0500 or P0833? Go to Diagnostic Trouble Code (DTC) List/Type  Go to Diagnostic System Check - Engine Controls in Engine Controls - 6.6L or Diagnostic System Check - Engine Controls in Engine Controls - 8.1L
8 Were any body control module (BCM) DTCs set? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 9 
9  Is the customer concern with Inspection/Maintenance (I/M) testing? Go to Inspection/Maintenance (I/M) System Check in Engine Controls - 6.6L or Inspection/Maintenance (I/M) System Check in Engine Controls - 8.1L Go to Step 10 
10
  1. Using the scan tool, clear the DTCs.
  2. Start the engine. Idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for Running DTC as specified in the supporting text.
Did a DTC set?		 Go to Diagnostic Trouble Code (DTC) List/Type  Go to Symptoms - Manual Transmission 
11 Update the PCM or ECM with the latest calibration, as necessary.
Did you perform the task?		 Go to Step 12  -
12
  1. Clear all DTCs.
  2. Test drive the vehicle while shifting through all gears.
Does the system operate normally without setting any DTCs?		 System OK Go to Step 1 
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