T-SB-0241-17

T-SB-0241-17
July 27, 2017
Reduced Power When Accelerating From a Stop
Service
Category
Engine/Hybrid System
Section
Hybrid/Battery Control System
Market USA
Applicability
YEAR(S)
MODEL(S)
ADDITIONAL INFORMATION
2016 - 2017
Prius
VDS(s): KBRFU
Introduction
Some 2016 – 2017 model year Prius vehicles equipped with a NiMH HV battery may exhibit one
or both of the following conditions after repeated driving on long downhill slopes:

When accelerating from a stop, or from extremely low speeds, the vehicle may have a
reduction in power.

The HV battery monitor on the multi-information display continually shows one bar,
indicating that the battery State-Of-Charge (SOC) is at its lowest level.
The Hybrid Control Computer (HV ECU) logic has been modified to reduce the possibility of these
conditions. Follow the repair procedure below to address these conditions.
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL
PLANT
Prius
Tsutsumi
LINE
PRODUCTION CHANGE EFFECTIVE VIN
1
JTDKBRFU#H3035100
2
JTDKBRFU#H3544587
© 2017 Toyota Motor Sales, USA
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Reduced Power When Accelerating From a Stop
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EG1656
Reprogram HV ECU
0.4
89981-47###
05
74
APPLICABLE WARRANTY
This repair is covered under the Toyota Hybrid Vehicle System Component Warranty. This
warranty is in effect for 96 months or 100,000 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.
Parts Information
PART NUMBER
PREVIOUS
PART NAME
QTY
Hybrid Vehicle Control Computer (HV ECU)
–
Authorized Modification Labels
1
NEW
89981-47550
89981-47551
89981-47553
89981-47552
00451-00001-LBL
NOTE
The HV ECU should NOT be replaced as part of the Repair Procedure.
Authorized Modification Labels may be ordered in packages of 25 from the Materials
Distribution Center (MDC) through Dealer Daily – Parts – Dealer Support Material Order.
© 2017 Toyota Motor Sales, USA
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Reduced Power When Accelerating From a Stop
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
Techstream 2.0*
Techstream Lite
PART NUMBER
QTY
TS2UNIT
ADE
Techstream Lite (Green Cable)
TSLITEPDLR01
1
TSLP2DLR01
NOTE
Only ONE of the Techstream units listed above is required.
Software version 12.10.018 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
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.
© 2017 Toyota Motor Sales, USA
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Reduced Power When Accelerating From a Stop
Calibration Information
MODEL
CALIBRATION ID
ENGINE
PREVIOUS
MAIN
899834751000
899834760000
NEW
SUB
899834760100
Prius
2ZR-FXE
SUB
899834751300
899854702200
899834734300
899854701200
899854702000
899834751100
899834751200
MAIN
899854702100
899834760200
899834734000
899834734100
899834734200
899834757000
899834757100
899834757200
899854701000
899854701100
899854707000
899854707100
Repair Procedure
1. Does the vehicle exhibit ANY of the following?
A. When accelerating from a stop, or from extremely low speeds, the vehicle has a reduction
in power.
B. The HV battery monitor on the multi-information display continually shows one bar,
indicating that the battery SOC is at its lowest level.
 YES — Continue to step 2.
 NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Confirm the vehicle has a NiMH battery by inspecting the 5th digit of the VIN.
Is the 5th character a “B”?

YES — Continue to step 3.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2017 Toyota Motor Sales, USA
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Reduced Power When Accelerating From a Stop
Repair Procedure (Continued)
3. Check for the Authorized Modifications Label affixed to the vehicle in the location shown below.
Confirm if the HV ECU calibration has been updated.
Is the calibration ID listed the latest HV ECU calibration?

YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.

NO — Continue to step 4.
Figure 1. Location of Authorized Modifications Label on 2016 – 2017 Prius
1
Replacement HV ECU Part Number
(i.e., 89981-47553)
4
Date Completed
2
New Calibration ID(s) (i.e., 899834751300899854702200)
5
This SB Number
3
Dealer Code
© 2017 Toyota Motor Sales, USA
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Reduced Power When Accelerating From a Stop
Repair Procedure (Continued)
4. Flash reprogram the HV ECU.
NOTE
The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain
battery voltage at 13.5V 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 T-SB-0134-16, “Techstream ECU Flash
Reprogramming Procedure,” and flash the HV ECU with the NEW calibration file update.
5. Prepare and 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. Install the Authorized Modifications Label on the vehicle at the location shown in
Figure 1. The Authorized Modifications Label is available through the MDC,
P/N 00451-00001-LBL.
6. Ready the vehicle ON, warm it up to normal operating temperature and test drive to confirm
proper vehicle operation.
© 2017 Toyota Motor Sales, USA