P15FB

DTC P15FB

Diagnostic Instructions

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

* Review Strategy Based Diagnosis Strategy Based Diagnosis for a overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P15FB
- Brake Pedal Position Sensor Signal Message Counter Incorrect

Circuit/System Description

The electronic brake control module (EBCM) monitors the brake pedal position sensor in order to provide emission related brake pedal position information to the engine control module (ECM). The EBCM sends the information, via the serial data circuit, to the ECM in a continuously repeating series of 16 rolling counts, with each count assigned a value. When the ECM determines that too many of the counts have an incorrect value, the ECM sets DTC P15FB.

Conditions for Running the DTC

* The vehicle is ON.

* DTC P15FB runs continuously when the above condition is met.

Conditions for Setting the DTC

The ECM detects that too many of the rolling counts have an incorrect value.

Action Taken When the DTC Sets

* DTC P15FB is a Type B DTC.

* Brake pedal position is defaulted to 0 for as long as the fault is active.

Conditions for Clearing the DTC

DTC P15FB is a Type B DTC.

Reference Information

Description and Operation

Hybrid Modes of Operation Description Hybrid Modes of Operation Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information.

Circuit/System Verification

Note:

* DTC P15FB is an informational DTC.

* Diagnose all other engine control module DTCs prior to DTC P15FB.

1. Verify that no other DTCs are set except for DTC P15FB.

• If any other DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If only DTC P15FB is set

2. Replace the K17 Electronic Brake Control Module.

3. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.

• If DTC sets
Replace the K20 Engine Control Module.

• If DTC does not set

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for Electronic Brake Control Module and Engine Control Module replacement, programming and setup