For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P0500: Vehicle Speed Sensor (VSS) Circuit
DTC P0500 08: Vehicle Speed Sensor (VSS) Circuit Signal Invalid
DTC P0500 11: Vehicle Speed Sensor (VSS) Circuit Above Maximum Threshold
DTC P0500 71: Vehicle Speed Sensor (VSS) Circuit Invalid Serial Data Received
DTC P0502: Vehicle Speed Sensor (VSS) Circuit Low Frequency
DTC P0503: Vehicle Speed Sensor (VSS) Circuit Intermittent

### Circuit/System Description

The transmission control module (TCM) provides the engine control module (ECM) vehicle speed information through the high-speed communications on the controller area network (CAN). Vehicle speed is produced by the AC current generated through the transmission output shaft speed (OSS) sensor as the output shaft rotates. The ECM continuously monitors the vehicle speed signal supplied by the TCM.

### Conditions for Running the DTC

• | The engine is running.

• | The DTCs run continuously once the above condition is met.

### Conditions for Setting the DTC

#### P0500 08 or P0502

The ECM detects the vehicle speed is less than 1 km/h for more than 5 seconds.

#### P0500 11 or P0503

The ECM detects the vehicle speed is greater than 300 km/h for more than 1 second.

#### P0500 71

The ECM detects the CAN signal is not valid for more than 2 seconds.

### Action Taken When the DTC Sets

DTCs P0500, P0502, and P0503 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P0500, P0502, and P0503 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

• | Engine Control Module Connector End Views

• | Engine Controls Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

• | Scan Tool Data List

• | Scan Tool Data Definitions

• | Scan Tool Output Controls

### Circuit/System Verification

1. Ignition On, observe the diagnostic trouble code (DTC) information with a scan tool. Verify no TCM or communication DTCs are set.

⇒ | If any TCM or communication DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

2. Raise the drive wheels.

Notice: Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel.

3. Support the lower control arms so that the drive axles are in a horizontal position.
4. Start and idle the engine.
5. Engage the transmission into 2nd gear.
6. Observe the scan tool VSS parameter. The following should display a vehicle speed once the drive wheels are at a speed above 2 km/h:

• | The VSS parameter

• | The speedometer

7. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

### Circuit/System Testing

1. Ignition OFF, test the CAN communication circuits between the ECM and the TCM for an open, short to ground, or a short to voltage.
2. If all circuits test normal, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for engine control module replacement, setup, and programming