Speedometer and/or Odometer Inaccurate or Inoperative

Speedometer and/or Odometer Inaccurate or Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

Diagnostic Fault Information





Reference Information
Schematic Reference

* Automatic Transmission Controls Schematics (Electrical Diagrams)
* Manual Transmission Schematics (D16 - Manual Transmission)for the D16 transmission
* Manual Transmission Schematics (Y4M - Manual Transmission)for the Y4M transmission

Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Electronic Component Description (Electronic Component Description)
* Transmission System Description and Operation (Transmission System Description and Operation)for the D16 transmission
* Transmission System Description and Operation (Description and Operation)for the Y4M transmission

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the scan tool VSS parameter. The reading should vary with the vehicle speed and not drop out.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observes from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the VSS harness connector.
2. Test for less than 5 Ohms between the low reference circuit terminal A and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal replace the ECM.

3. Ignition ON, test for greater than 4 V between the 5 V reference circuit terminal C and ground.

• If less than the specified value, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the ECM.

4. Ignition ON, test for greater than 4 V between the signal circuit terminal B and ground.

• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the ECM.

5. If all circuits test normal replace the VSS.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

Control Module References (Programming and Relearning)for ECM replacement, setup, and programming