For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Instrument Cluster Schematics
1 | Did you review the Instrument Panel, Gages and Console Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Instrument Panel, Gages and Console
2 | Verify that the speedometer and the odometer inaccurate. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 | Using a scan tool, test for a DTC P0500. Does the scan tool register a DTC P0500? | Go to one of the following procedures:

• | DTC P0500 in Manual Transmission - MB4 and MB5

• | DTC P0500 in Automatic Transmission - 4 Speed MS7

Go to Step 4

4 | Does the speedometer register any change in position? | Go to Step 5 | Go to Step 12
5 |

1. Raise the drive wheels.
2. Support the lower control arms so that the drive axles are in a horizontal (straight) position.
3. Start and idle the engine.
4. Accelerate the car so the speedometer reads around 32 km/h (20 mph).
5. Measure the frequency of the output of the VSS cavity 3.

Is the measured frequency within the specified range?

Go to Step 6

Go to Step 7

6 | Test the WHT/BLU wire between the VSS connector cavity 3 and the instrument cluster assembly connector C2 cavity 10 for an open. Is an open condition present? | Go to Step 9 | Go to Step 8
7 |

1. Turn the vehicle OFF.
2. Replace the VSS. Refer to one of the following procedures:

• | Vehicle Speed Sensor Replacement in Manual Transmission - MB4 and MB5

• | Vehicle Speed Sensor Replacement in Automatic Transmission - 3 Speed - MB3

Did you complete the repair?

Go to Step 23

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8 | Inspect the instrument cluster assembly printed circuit for damage. Is the printed circuit damaged? | Go to Step 11 | Go to Step 10
9 | Repair the open in the VSS signal input circuit between the VSS connector cavity 3 and the instrument cluster assembly connector C2 cavity 10. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | --
10 | Replace the speedometer/odometer. Refer to Speedometer Replacement . Did you complete the repair? | Go to Step 23 | --
11 | Replace the instrument cluster printed circuit. Refer to Printed Instrument Cluster Circuit Replacement . Did you complete the repair? | Go to Step 23 | --
12 |

1. Turn the ignition switch to the ON position.
2. Using a test lamp, check the VSS cavity 1 to ground.

Does the test lamp illuminate?

Go to Step 13

Go to Step 14

13 |

1. Turn the ignition switch to the OFF position.
2. Disconnect the VSS connector.
3. Test for continuity between the VSS connector cavity 2 to ground.

Is continuity present?

Go to Step 21

Go to Step 16

14 | Repair the open in the ignition voltage circuit between the VSS cavity 1 and the SP258 C2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 23 | --
15 | Replace the VSS. Refer to one of the following procedures:

• | Vehicle Speed Sensor Replacement in Manual Transmission - MB4 and MB5

• | Vehicle Speed Sensor Replacement in Automatic Transmission - 3 Speed - MB3

Did you complete the repair?

Go to Step 23

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16 | Are any other gauges inaccurate? | Go to Step 18 | Go to Step 17
17 | Test the RED/WHT wire between the VSS cavity 2 and the instrument cluster assembly connector C2 cavity 4 for an open. Is a short condition present? | Go to Step 20 | Go to Step 8
18 | Test the BRN wire between the instrument cluster assembly connector C3 cavity 15 and ground for a short. Is a short condition present? | Go to Step 19 | Go to Step 8
19 | Repair the short in the BRN wire between the instrument cluster assembly connector C3 cavity 15 and ground. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | --
20 | Repair the open in the RED/WHT wire between the VSS cavity 2 and the instrument cluster assembly connector C2 cavity 4. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | --
21 | Test the VSS signal input circuit between the VSS and the instrument cluster for an open. Is an open condition present? | Go to Step 22 | Go to Step 15
22 | Repair the open in the VSS signal input circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | --
23 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3