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 Descriptor

DTC P0630: VIN Not Programmed or Mismatched - Engine Control Module (ECM)

### Circuit/System Description

This DTC sets when the engine control module (ECM) has determined that the vehicle identification number (VIN) is not stored in the ECM memory. When the control module is replaced, the VIN must be programmed into the control module memory.

### Conditions for Running the DTC

• | The ignition is ON.

• | The DTC runs continuously when the above condition is met

### Conditions for Setting the DTC

The ECM detects that no VIN is stored in memory.

### Action Taken When the DTC Sets

DTC P0630 is a type A DTC.

### Conditions for Clearing the DTC

DTC P0630 is a type A DTC.

### Diagnostic Aids

Some diagnostics will not run when the MIL is illuminated and DTC P0630 is set. Always program the VIN to the control module immediately after replacement.

If there are difficulties programming the VIN, ensure that all connections to the ECM and equipment are correct. Ensure that the latest software is installed and all programming procedures are performed correctly.

### Reference Information

#### Description and Operation

Engine Control Module Description

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Important: The ECM cannot determine if the VIN programmed into the control module is valid. Always verify that the VIN displayed on the scan tool is correct for that vehicle.

1. Ignition ON, observe the Vehicle Information with a scan tool. The VIN information should match the vehicles VIN.

⇒ | If a VIN is not displayed, program the VIN with a scan tool.

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 observed from the Freeze Frame/Failure Records data.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming