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

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Go to Step 2

Engine Controls

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 Automatic Transmission/ Transaxle

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 symptom still present?

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System OK

Are one or more of the speed related features inoperative along with the head-up display?

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System OK

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 8

Go to Step 9

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 symptom still present?

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System OK

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 symptom still present?

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System OK

1. Inspect the vehicle for any inoperative speed related features.
2. Disconnect any inoperative speed related components.
3. Turn the ignition switch to the RUN position.
4. Use a DMM in order to measure the voltage between the inoperative component harness connector CKT 389 and ground.

If more than one or all of the components are inoperative, measure the voltage at any particular component harness connector.

Is the measured voltage within the specified value?

Less than B+, greater than 5 Volts

Go to Step 12

Go to Step 11

1. Inspect CKT 389 for an open, a poor connection, a short to ground, or a short to B+.
2. If OK, inspect the modules for any internal shorts at the vehicle speed input terminals.
3. Inspect the system.

Is the symptom still present?

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System OK

1. Ensure that the DMM is connected from the inoperative component harness connector CKT 389 and ground.
2. Turn the ignition switch to the RUN position.
3. Slowly rotate a drive wheel by hand in the forward direction.

Is the measured voltage within the specified value?

The voltage will vary from less than 1 Volt to greater than 2.5 Volts.

Go to Step 13

Go to Step 14

1. Inspect the inoperative component for a poor connection.
2. If OK, replace the inoperative component.
3. Inspect the system.

Is the symptom still present?

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System OK

1. Reconnect all of the speed related components.
2. Disconnect the powertrain control module (PCM) harness connector C1.
3. Use a DMM in order to measure the voltage between the PCM harness connector C1 terminal 13 and ground.
4. Turn the ignition switch to the RUN position.

Is the measured voltage within the specified value?

Less than B+, greater than 5 Volts

Go to Step 15

Go to Step 16

1. Inspect the PCM harness connector for a poor connection.
2. If OK, replace the PCM. Refer to PCM Replacement in Engine Controls.
3. Inspect the system.

Is the symptom still present?

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System OK

1. Inspect CKT 389 for an open, a poor connection, a short to ground, or a short to B+ between the inoperative component and the PCM harness connector.
2. Inspect the system.

Is the symptom still present?

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System OK