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 P260E: Diesel Particulate Filter Regeneration Lamp Control Circuit
DTC P260E 01: Diesel Particulate Filter Regeneration Lamp Control Circuit Short to Battery
DTC P260E 02: Diesel Particulate Filter Regeneration Lamp Control Circuit Short to Ground
DTC P260E 04: Diesel Particulate Filter Regeneration Lamp Control Circuit Open Circuit
DTC P260E 54: Diesel Particulate Filter Regeneration Lamp Control Circuit Temperature High

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Voltage Supply | P260E, P260E 02 | P260E, P260E 04 | -- | --
Control Circuit | P260E, P260E 02 | P260E, P260E 04 | P260E, P260E 01 | P260E 54

### Circuit/System Description

The diesel particulate filter regeneration lamp is located on the instrument panel cluster (IPC). The lamp informs the driver when a diesel particulate filter service is required. The engine control module (ECM) monitors the lamp control circuit for conditions that are incorrect for the commanded state of the lamp. For example, a failure condition exists if the ECM detects low voltage when the lamp is commanded OFF, or high voltage when the lamp is commanded ON.

### Conditions for Running the DTC

• | The ignition is ON.

• | The ignition voltage is between 8.5-16.5 volts.

• | DTC P260E runs continuously once the above conditions are met.

### Conditions for Setting the DTC

#### P260E 01

The ECM detects a short to voltage on the circuit that controls the lamp.

#### P260E 02

The ECM detects a short to ground on the circuit that controls the lamp.

#### P260E 04

The ECM detects an open on the circuit that controls the lamp.

#### P260E 54

The ECM detects that the internal output driver is over temperature.

### Action Taken When the DTC Sets

DTC P260E is a Type C DTC.

### Conditions for Clearing the DTC

DTC P260E is a Type C DTC.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component 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

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, command the lamp ON and OFF with a scan tool. The lamp should turn ON and OFF as commanded.

### Circuit/System Testing

1. If any other IPC indicators or gages are inoperative, refer to Symptoms - Displays and Gages.
2. Ignition OFF, disconnect the ECM harness connectors. Ignition ON, the lamp should not illuminate.

⇒ | If the lamp is illuminated, test the lamp control circuit for a short to ground. If the circuit tests normal, replace the IPC.

3. Ignition ON, install a 3A fused jumper wire between the lamp control circuit and ground. The lamp should illuminate.

⇒ | If the lamp does not illuminate, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the IPC/bulb.

4. If all circuits test normal, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Instrument Cluster Replacement

• | Instrument Cluster Bulb Replacement

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