Has the vehicle been checked for diagnostic trouble codes (DTC's)

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.1L or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.8L

Does the speedometer on the instrument cluster operate normally?

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Go to Step 6

Go to Step 3

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

Do the 2 speeds agree with each other?

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Go to Step 4

Go to Step 6

Inspect the vehicle for the following applications:

Are the component applications correct?

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Refer to Electronic Component Description in Automatic Transaxle - 4T60-E or to Electronic Component Description in Automatic Transaxle - 4T65-E

Go to Step 5

1. Replace the following components, as needed:

•

The tires

•	The vehicle speed sensor

2. Recalibrate the PCM, if needed.
3. Inspect the system.

Is the repair complete?

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System OK

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Inspect CKT 389 for an open, a poor connection, a short to ground, or a short to B+ between the instrument cluster head-up display (HUD) harness connector terminal A7 and the PCM harness connector C1 terminal 13.

Is CKT 389 shorted, open, or showing signs of excessive resistance between the instrument cluster head-up display (HUD) harness connector terminal A7 and the PCM harness connector C1 terminal 13?

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Go to Step 7

Go to Step 8

1. Repair the open, the poor connection, the short to ground, or the short to B+ between the instrument cluster harness connector C2 terminal K and the PCM harness connector C1 terminal 13.
2. Inspect the system.

Is the repair complete?

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System OK

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1. Inspect the instrument cluster head-up display (HUD) for a poor connection.
2. If OK, replace the instrument cluster head-up display. Refer to Head Up Display Module Replacement .
3. Inspect the system.

Is the repair complete?

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System OK

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