Has the vehicle been inspected for Diagnostic Trouble Codes (DTCs)?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.1L (LG8)

1. Connect a scan tool to the DLC connector.
2. Drive the vehicle and compare the scan tool speed display to the instrument cluster speed display.

Do the 2 speeds correspond with each other?

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Go to Step 3

Go to Step 6

Are both the speedometer and the odometer inaccurate?

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Go to Step 4

Go to Step 7

Inspect the vehicle for the correct tire size, PCM calibration, and vehicle speed sensor application.

Are the component applications correct?

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Go to Powertrain On Board Diagnostic (OBD) System Check - Automatic Transmission in Engine Controls - 3.1L (LG8)

Go to Step 5

1. Replace the tires and the vehicle speed sensor, or recalibrate the PCM with the correct application for the vehicle.
2. Inspect the system.

Is the symptom still present?

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Go to Step 6

System OK

Does one or more of the speed related features operate improperly along with the instrument cluster?

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Go to Powertrain On Board Diagnostic (OBD) System Check - Automatic Transmission in Engine Controls - 3.1L (LG8)

Go to Step 7

Inspect CKT 389 for the following conditions:

Does a short, an open, or any signs of excessive resistance between the instrument cluster connector terminal D9 and the PCM connector C1 terminal 55 exist?

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Go to Step 8

Go to Step 9

1. Repair the following conditions:

•

The open

•	The excessive resistance

•	The short to ground

•	The short to battery voltage between the instrument cluster connector terminal D9 and the PCM connector C1 terminal 55

2. Inspect the system.

Is the symptom still present?

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Go to Step 9

System OK

1. Inspect the instrument cluster for a poor connection.
2. If the connection is OK, replace the instrument cluster. Refer to Instrument Cluster Replacement .
3. Inspect the system.

Is the repair complete?

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System OK

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