GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Connect a scan tool.
  2. Inspect for engine control diagnostic trouble codes (DTCs).

Is the vehicle speed sensor DTC set?

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Go to Diagnostic System Check - Vehicle

Go to Step 2

2

  1. Turn the ignition OFF.
  2. Disconnect the engine control module (ECM) connector.
  3. Remove the instrument cluster.
  4. Measure the continuity between the ECM terminal K6 (MR-140), terminal B23 (HV-240), terminal 51 (SIRUS D4) in Gasoline and terminal K74 in Diesel and the instrument cluster terminal B5.

Does the ohmmeter indicate the specified value?

0 ohms

Go to Step 4

Go to Step 3

3

Repair the open circuit between the instrument cluster connector terminal B5 and the ECM.

Is the repair complete?

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System OK

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4

Replace the speedometer.

Is the repair complete?

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System OK

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