GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Prepare the vehicle for a road test.
  2. Check the power steering fluid level.
  3. Check the power steering belt tension.
  4. Check the tire inflation.
  5. Road test the vehicle using various parking maneuvers and a level stretch of highway.

Does the steering force lessen when parking and require more force as the vehicle speed increases?

--

Go to Step 3

Go to Step 2

2

Refer to Power Steering Gear and Pump On Vehicle Service in Steering for the diagnostic procedures.

Was the problem found and repaired?

--

Go to Step 9

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3

  1. The procedure for reading DTCs is to use the scan tool.
  2. When reading DTCs, follow the instructions that are supplied by the scan tool manufacturer.
  3. Connect the scan tool to the data link connector (DLC).
  4. Establish communication with the power steering control module.

Does the scan tool communicate with the power steering control module?

--

Go to Step 5

Go to Step 4

4

Go to Scan Tool Does Not Communicate with Power Steering Control Module for diagnosis.

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--

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5

Are there any current DTCs displayed?

--

Go to Step 6

Go to Step 7

6

  1. If DTC 21 is present, refer to DTC 21 No Speed Signal for diagnostic procedures.
  2. If DTC 22 is present, refer to DTC 22 Solenoid Circuit Short to Ground/Open for diagnostic procedures.
  3. If DTC 23 is present, refer to DTC 23 Power Steering Control Module Malfunction for diagnostic procedures.

Go to the appropriate table to diagnose the DTC.

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--

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7

Are any history or intermittent codes displayed?

--

Go to Step 8

Go to Step 9

8

Refer to the Diagnostic Aids that are related to the particular DTC and locate and repair the problem.

Was the intermittent problem found and repaired?

--

Go to Step 9

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9

  1. Connect all connectors and components that were disconnected.
  2. Install the scan tool.
  3. Check for any current or history or intermittent DTCs.

Are there any current or history or intermittent DTCs present?

--

Go to Step 1

System OK