Hybrid Controls - MIL ON/DTC P0136 Stored In Memory

L-SB-0035-12

May 10, 2012

MIL "ON" DTC P0136

Service Category
Engine/Hybrid System

Section
Engine Control

Market
USA





Applicability

Introduction

Some 2010 - 2012 model year HS 250h vehicles equipped with a 2AZ-FXE engine may exhibit a MIL "ON" condition with Diagnostic Trouble Code (DTC) P0136 - Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2). The oxygen sensor and Hybrid Vehicle ECU (HV ECU) logic have been modified to reduce the possibility of this condition occurring. Use the following repair procedure to address this condition.





Warranty Information





Calibration Information





Parts Information





Required Tools & Equipment

Repair Procedure

1. Using TIS Techstream, check for stored DTCs. If only DTC P0136 is present, proceed to step 2.

2. Remove and replace the oxygen sensor (Bank 1 Sensor 2).

Refer to the Technical Information System (TIS), applicable model year HS 250h Repair Manual:
Engine/Hybrid System - Engine Control - "2AZ-FXE Engine Control: Heated Oxygen Sensor: Removal / Installation"

^ 2010 HS 250h: Removal / Installation

^ 2011 HS 250h: Removal / Installation

^ 2012 HS 250h: Removal / Installation





3. Check for the Authorized Modi.cations Label affixed to the vehicle in the location shown in Figure 1. Confirm if the HV ECU calibration has been updated. If the calibration ID listed is NOT the latest HV ECU calibration - go to step 4.

4. Flash Reprogram the HV ECU.

NOTE

^ The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.

^ For details on how to use the GR8 Battery Diagnostic Station, refer to the GR8 Instruction Manual located on the Technical Information System (TIS), Diagnostics - Battery.

Follow the procedures outlined in Service Bulletin L-SB-0015-10, "Techstream ECU Flash Reprogramming Procedure", and flash the HV ECU with the NEW calibration file update.

5. Place vehicle into Ready "ON" mode and test drive the vehicle to confirm proper vehicle operation of the HV ECU.

6. Install the Authorized Modifications Label.

A. Using a permanent marker, enter the following information on the label:

^ HV ECU part number [Refer to the Parts Information section for the CURRENT PART NUMBER]

^ Calibration ID(s) [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]

^ Dealer Code

^ Repair Date

^ Change Authority [This SB number]

B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.

© 2012 Lexus, a division of Toyota Motor Sales, USA