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Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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. 2:  Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 4:  The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
Diagnostic System Check - Electronic Suspension Control

Step Action Yes No
1 Install a scan tool.
Does the scan tool power up?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the following modules:
    • Electronic Suspension Control (ESC) Module
    • Electronic Brake Control Module (EBCM)
    • Powertrain Control Module (PCM)
Does the scan tool communicate with all of the listed control modules?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
3 Select the display DTCs function on the scan tool for the following modules:
  • ESC Module
  • Electronic Brake Control Module (EBCM)
  • Powertrain Control Module (PCM)

Does the scan tool display any DTCs?		 Go to Step 4  Go to Symptoms - Electronic Suspension Control 
4  Does the scan tool display any DTCs which begin with a "U"? Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications Go to Step 5 
5 Does the scan tool display any PCM DTCs? Go to Diagnostic Trouble Code (DTC) List in Engine Controls Go to Step 6 
6 Does the scan tool display any EBCM DTCs? Go to Diagnostic Trouble Code (DTC) List in ABS Traction Control Go to Step 7 
7 Does the scan tool display DTC C0550? Go to DTC C0550  Go to Step 8 
8 Does the scan tool display DTC C0563? Go to DTC C0563  Go to Step 9 
9 Does the scan tool display DTC C0578, C0583, C0588 or C0593? Go to DTC C0578, C0583, C0588, or C0593  Go to Step 10 
10 Does the scan tool display DTC C0690, C0691 or C0693? Go to DTC C0690, C0691, or C0693  Go to Diagnostic Trouble Code (DTC) List 
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