GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: Allows For Both Inaccurate and Inoperative Readings.

1

Did you perform the Instrument Cluster System Check?

--

Go to Step 2

Go to Instrument Cluster System Check

2

Are both the speedometer and the odometer inaccurate?

--

Go to Step 3

Go to Step 4

3

Using a scan tool, test for a DTC P0500.

Does the scan tool register a DTC P0500?

--

Go to DTC P0500 Vehicle Speed Sensor (VSS) Circuit

Go to Step 8

4

Does the speedometer register any change in position?

--

Go to Step 5

Go to Step 12

5

  1. Raise the drive wheels.
  2. Support the lower control arms so that the drive axles are in a horizontal (straight) position.
  3. Start and idle the engine.
  4. Accelerate the car so the speedometer reads around 32 km/h (20 mph).
  5. Using a J 39200 , measure the frequency of the output of the VSS cavity 3.

is the measured frequency within the specified range?

17-23 Hz

Go to Step 6

Go to Step 7

6

Test the WHT/BLU wire using a J 39200 between the VSS connector cavity 3 and the instrument cluster assembly connector C2 cavity 10 for an open.

Does the wire have an open?

--

Go to Step 9

Go to Step 8

7

  1. Turn the vehicle OFF.
  2. Replace the VSS. Refer to Vehicle Speed Sensor Replacement in Engine Controls.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8

Inspect the instrument cluster assembly printed circuit for damage.

Is the printed circuit damaged?

--

Go to Step 11

Go to Step 10

9

Repair the open in the WHT/BLU wire between the VSS connector cavity 3 and the instrument cluster assembly connector C2 cavity 10. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

10

Replace the speedometer/odometer. Refer to Speedometer Replacement .

Is the repair complete?

--

Go to Instrument Cluster System Check

--

11

Replace the instrument cluster printed circuit. Refer to Printed Instrument Cluster Circuit Replacement .

Is the repair complete?

--

Go to Instrument Cluster System Check

--

12

  1. Turn the ignition switch to the ON position.
  2. Using a test lamp, backprobe the VSS cavity 1 to ground.

Does the test lamp illuminate?

--

Go to Step 13

Go to Step 14

13

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the VSS connector.
  3. Using a J 39200 , test for continuity between the VSS connector cavity 2 to ground.

Is there continuity?

--

Go to Step 21

Go to Step 16

14

Repair the open in the RED/BLU wire between the VSS cavity 1 and the SP258 C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

15

Replace the VSS. Refer to Vehicle Speed Sensor Replacement in Engine Controls.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

16

Are any other gauges inaccurate?

--

Go to Step 18

Go to Step 17

17

Test the RED/WHT wire using a J 39200 between the VSS cavity 2 and the instrument cluster assembly connector C2 cavity 4 for an open.

Does the wire have an open?

--

Go to Step 20

Go to Step 8

18

Test the BRN wire using a J 39200 between the instrument cluster assembly connector C3 cavity 15 and ground for a short.

Does the wire have a short?

--

Go to Step 19

Go to Step 8

19

Repair the short in the BRN wire between the instrument cluster assembly connector C3 cavity 15 and ground. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

20

Repair the open in the RED/WHT wire between the VSS cavity 2 and the instrument cluster assembly connector C2 cavity 4. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

21

Test the WHT/BLU wire using a J 39200 between the VSS and the instrument cluster for an open.

Does the wire have an open?

--

Go to Step 22

Go to Step 15

22

Repair the open in the WHT/BLU wire. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

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