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Home >> Chevrolet >> 2004 >> Epica LS >> Repair and Diagnosis (Single Page) >> Steering >> Electronic Steering >> Variable Effort Steering System >> Diagnostic Information and Procedures >> Diagnostic System Check - Variable Effort Steering >> Test Description

Test Description

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 serial data circuit or due to a total malfunction of the serial data circuit. The specified procedure will determine the particular condition.
Step Action Yes No
Schematic Reference: Variable Effort Steering Schematics 
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 speed sensitive power steering (SSPS) control module.
Does the scan tool communicate with the SSPS module?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Component in Data Link Communications
3 Select the ECM display DTC function on the scan tool.
Does the scan tool display any DTCs?		 Go to Diagnostic System Check - Engine Controls (Non European Emissions) or Diagnostic System Check - Engine Controls (European Emissions) in Engine Controls - 2.0 L or Diagnostic System Check - Engine Controls in Engine Controls - 2.5 L Go to Step 4 
4 Select the SSPS display DTC function on the scan tool.
Does the scan tool display any DTCs?		 Go to Diagnostic Trouble Code (DTC) List  Go to Symptoms - Power Steering System
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