Check that the vehicle speed sensor buffer is correctly calibrated for axle ratio and tire size.

Is the condition resolved?

--

System OK

Go to Step 2

1. Connect a Scan Tool in order to monitor the vehicle speed.
2. Drive the vehicle over a known distance.

•	Maintain a distance of 8 km (5 mi) or more.

•	Maintain a speed of 80-110 km/h (50-65 mph), if practical.

3. Using a scan tool, compare the indicated speed to the speedometer indication.
4. Record the initial and final odometer reading and the actual distance driven.

While at speed, are the scan tool and speedometer readings within 6 km/h (4 mph) of each other?

--

Go to Step 3

Go to Step 4

This indicates that the speedometer accuracy is within tolerance. Divide the actual distance driven by the distance driven as indicated by the odometer.

Is the indicated ratio within the specified values?

0.96-1.04

System OK

Go to Step 4

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

System OK

--