July 10, 2015

L-SB-0027-15

O2 Sensor Readiness Monitor Does Not Complete
Service
Category

Engine/Hybrid System

Section

Emission Control

USA

Market

Applicability
YEAR(S)

MODEL(S)

2007

RX400H

ADDITIONAL INFORMATION

Introduction

Some 2007 model year RX 400h vehicles may exhibit a condition of oxygen sensor readiness
monitors incomplete during state emissions testing. The Hybrid Vehicle (HV) ECU logic has been
updated to address this condition.
Production Change Information

This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL

DRIVETRAIN

PRODUCTION CHANGE EFFECTIVE VIN

2WD

JTJGW31U#72003519

4WD

JTJHW31U#72020196

RX 400h

Warranty Information
OP CODE

DESCRIPTION

TIME

OFP

T1

T2

EG1502

Reprogram HV ECU and ECM (PCM)

0.8

89981–#####

99

74

APPLICABLE WARRANTY
• This repair is covered under the Lexus Federal Emission Warranty. This warranty is in effect
for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.
• Warranty application is limited to occurrence of the specified condition described in
this bulletin.

© 2015 Lexus, a division of Toyota Motor Sales, USA

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O2 Sensor Readiness Monitor Does Not Complete

Parts Information
MODEL
YEAR

DRIVETRAIN

OIL
COOLER

PREVIOUS

NEW

With

89981-48160
89981-48161

89981-48162
89981-48163

Without

89981-48180
89981-48181

89981-48182
89981-48183

With

89981-48190
89981-48191

89981-48192
89981-48193

Without

89981-48200
89981-48201

89981-48202
89981-48203

2WD
2007
4WD

All

All

PART NUMBER

All

00451-00001-LBL

PART NAME

QTY

Computer, Hybrid
Vehicle Control

–

Authorized Modification
Labels

1

NOTE
• The HV ECU should NOT be replaced as part of this Repair Procedure.
• Authorized Modification Labels may be ordered in packages of 25 from the Materials
Distribution Center (MDC) through Dealer Daily – Dealer Support Materials Orders.

Required Tools & Equipment
REQUIRED EQUIPMENT

Techstream 2.0*
Techstream Lite

SUPPLIER

ADE

PART NUMBER

TS2UNIT
TSLITEPDLR01

NOTE
• Only ONE of the Techstream units listed above is required.
• Software version 10.10.018 or later is required.
• Additional Techstream units may be ordered by calling Approved Dealer
Equipment (ADE) at 1-800-368-6787.
• The Diagnostic Tester is NOT recommended for flash reprogramming.
Please use Techstream or an approved J2534 interface to perform flash
reprogramming updates. Visit techinfo.toyota.com for more information
regarding J2534 reprogramming.

© 2015 Lexus, a division of Toyota Motor Sales, USA

QTY

1

L-SB-0027-15

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Required Tools & Equipment (Continued)
SPECIAL SERVICE TOOLS (SST)

PART NUMBER

QTY

GR8 Battery Diagnostic Station*

00002-MCGR8

1

NOTE
Additional SSTs may be ordered by calling 1-800-933-8335.
* Essential SST.

Calibration ID Information
NOTE
There are different calibration files for vehicles with and without transaxle oil coolers. In order to
determine the configuration of your vehicle, shine a flashlight into the left front bumper cover vent.
If the vehicle is equipped with a cooler, it will be easily visible.
Figure 1. Location of Transaxle Oil Cooler (on Equipped Vehicles)

© 2015 Lexus, a division of Toyota Motor Sales, USA

July 10, 2015

L-SB-0027-15

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O2 Sensor Readiness Monitor Does Not Complete

Calibration Information
MODEL YEAR

DRIVETRAIN

OIL COOLER

With
2WD
Without
2007
With
4WD
Without

CALIBRATION ID

ECM (CPU)/
ECU

PREVIOUS

Main

348A0000

Sub

899834813000

Main

348A0000

Sub

899834814000

Main

348A0000

Sub

899834815000

Main

348A0000

Sub

899834816000

NEW

348A0100/899834813100

348A0100/899834814100

348A0100/899834815100

348A0100/899834816100

Repair Procedure

1. Prepare the vehicle for reflash.
NOTE
This procedure will pressurize the brake actuator and prevent the ABS pump from running
during the reflash procedure.

A. Prior to vehicle shut down perform the following steps:
• Place the vehicle in the ready on position.
• Place the transaxle in the P range.
• Engage parking brake .
B. Depress the brake pedal fully 2 times within 2 seconds.
C. Release brake pedal.
D. Wait 10 seconds.
E. Turn off the vehicle.

© 2015 Lexus, a division of Toyota Motor Sales, USA

L-SB-0027-15

July 10, 2015

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Repair Procedure (Continued)

2. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in
Figure 2. Confirm if the HV ECU and ECM (PCM) calibrations have been updated. If the
calibration IDs are NOT the new calibrations — go to step 2.
Figure 2. Location of Authorized Modifications Label on 2007 RX 400h

1

Replacement ECM (PCM) Part Number (i.e.,
89981-48162)

2

New Calibration ID(s) (i.e., 348A0100)

3

Dealer Code

4

Date Completed

5

This SB Number

© 2015 Lexus, a division of Toyota Motor Sales, USA

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Repair Procedure (Continued)

3. Flash Reprogram the HV ECU and the ECM (PCM).
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 – Tools & Equipment – Battery Diagnostics.

Follow the procedures outlined in Service Bulletin No. L-SB-0021-14, “Techstream ECU Flash
Reprogramming Procedure,” and flash the ECM (PCM) with the NEW calibration file update.
NOTE
• Anytime the HV ECU is reprogrammed, the engine ECM (PCM) MUST also be
reprogrammed, even if the engine ECM (PCM) has the “New Calibration ID.”
• If ONLY the engine ECM (PCM) Calibration ID matches the “Current Calibration ID” shown
in the Calibration Information section in this bulletin, proceed with flash reprogramming.
• If BOTH the engine ECM (PCM) and HV ECU Calibration IDs match the “New” calibration IDs
shown in the Calibration Information section, this vehicle has already been reprogrammed.
Refer to TIS for diagnostic procedures applicable to any stored DTCs.

4. Start the engine and warm it up to normal operating temperature before test driving.
5. Test drive the vehicle to confirm proper vehicle operation (and proper laser cruise control
operation, if equipped).
6. Confirm that the O2 Sensor monitor reads complete.
7. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
• ECM part number [Refer to the Parts Information section for the NEW PART NUMBER]
• Calibration ID(s) [Refer to the Calibration Information section for the NEW
CALIBRATION ID]
• Dealer Code
• Repair Date
• Change Authority [This bulletin number]
B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 2. The
Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.

© 2015 Lexus, a division of Toyota Motor Sales, USA

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July 10, 2015

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Repair Procedure (Continued)

8. Calibration update is complete.
NOTE
The effect of the NEW calibration may become more apparent after several days of driving as
the ECM (PCM) “learned values” are re-established from the customer’s driving.

© 2015 Lexus, a division of Toyota Motor Sales, USA