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 P161C: Tire Size Not Programmed

### Circuit/System Description

This diagnostic addresses if the ECM is not programmed with the tire size.

### Conditions for Running the DTC

• | The ignition is ON.

• | The DTC runs continuously once the above condition is met.

### Conditions for Setting the DTC

The ECM detects that the tire size is not programmed in the EEPROM for greater than 1 second.

### Action Taken When the DTC Sets

DTCs P161C is a Type C DTC.

### Conditions for Clearing the DTC

DTCs P161C is a Type C DTC.

### Reference Information

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

### Circuit/System Testing

Program the ECM. If DTC P161C sets after programming, perform the following steps:

• | Ensure that all tool connections are secure.

• | Ensure the programming equipment is operating correctly.

• | Ensure the correct software and the correct calibration is used.

• | Attempt to program the ECM.

⇒ | If DTC P161C sets, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.