MOTORCYCLE

08/10/2018

M2018-009

©2018 YAMAHA MOTOR CORPORATION, U.S.A.

All 2017~2018 YZF-R6 models – Difficult to start when the engine is cold

Problem:

Under certain conditions, customers may experience difficulty starting
the engine when cold. When this happens, the customer has to hold the
start button for an extended period of time or make multiple attempts to
get the engine to start.

Cause:

Due to the variety of blends and varying ethanol content of fuel available
within the US market, the air / fuel ratio may become too lean at the time
of start-up.

Remedy:

To remedy this condition, the factory has developed revised ECU fuel mapping for injection
duration at start-up to correspond to the varying types of gasoline available in the US market. If
you encounter a customer who has experienced this condition, please update the unit’s ECU with
the revised program using the YDT (Yamaha Diagnostic Tool).

NOTE: This modification does not alter emissions compliance of the product.

Unsold
Units:

To ensure customer satisfaction, update the ECU program on all affected unsold units at the time
of PDI using the YDT (Yamaha Diagnostic Tool).

Sold Units:
Parts
Required:

If you encounter a customer who has experienced this condition on an affected unit, update the
unit’s ECU with the revised program using the YDT (Yamaha Diagnostic Tool).
No.

Warranty:

Submit a Service-per-Bulletin (90 Code) Warranty Request for reimbursement refer to the Warranty
Information section).

All 2017 and 2018 model YZF-R6 motorcycles, PID’s listed below:
Model

Model Code

Frame Number
Prefix

From

To

Spec

2017 YZF-R6H

BN61

RJ28E

0000009

0002412

U49

2017 YZF-R6HC

BN62

RJ28Y

0000016

0001254

CA

2018 YZF-R6J

BN67

RJ28E

0002413

0003918

U49

2018 YZF-R6JC

BN68

RJ28Y

0001255

0001866

CA
Page 1 of 6

1.

Make sure the Yamaha Diagnostic Tool (YDT) Version 3.1 or later is up to date, including importing any
and all new Standard, Definition, and ECU reprogramming files available for the tool. When the software
is launched, YDT will automatically check for these updates if the computer is connected to the internet. If
updates are available, install them by following the prompts within the program.

TIP: If firmware for the Adapter Interface (AI) is available, you must follow the on-screen prompts to import
it. Then, connect the AI to the computer and update it from the “System Maintenance” tab at the top of
the home screen. Next, choose “Adapter Interface Reprogram.” Consult the YDT Operation Manual for
additional details, which is also located within the System Maintenance menu.

2.

Before beginning the process, verify the computer’s screensaver is disabled, close all other programs
running on the PC, and verify the battery of the unit being modified is completely charged.
Establish a full connection to the vehicle by using the “Connect the vehicle” function.

NOTICE:
The battery voltage of the vehicle must be fully charged in order to successfully reprogram
the ECU. It is advised to connect the vehicle to an appropriate battery charger during the
reprogramming process. DO NOT allow the PC’s screen saver to initiate during this reprogramming
process. Avoid using other programs, do not disconnect any of the cables, and do not turn
the ignition switch off during the ECU reprogramming process. Failure to follow any of these
instructions may result in irreversible damage to the ECU.

Page 2 of 6

RJ28E-00000X

3/01/2018
YZF-R6
BN67

If the unit has previously been connected to YDT v.3.x, the unit’s information will already be present. If
this is the first time YDT has been connected to the vehicle, you will be prompted to enter the unit’s VIN
and customer information in order to proceed.
It is CRITICAL to enter the proper VIN or PID and verify the Model Code is correct. If you are unsure of
the model code, generally it is located under the seat on a small label.
On the “Add maintenance record” screen, select Recall/Service campaign from the drop-down menu.
Add the technician and mileage, then click “Save” in the bottom right corner of the screen. Next, choose
“Select function” option at the top of the screen, which will bring you to the function menu.
3.

From the function menu, click on “Reprogram ECU.”

Once the Reprogramming function opens, be patient while the Diagnostic Tool reads the ECU’s
information; reading the ECU may take several minutes. When the information has successfully
been read, the “before program” chart will populate. To ensure the unit has not been previously
reprogrammed, verify the “Reprogram date” is displayed as “00000000.” When you have verified this
information, click “Start reprogram” from the bottom right side corner.

Page 3 of 6

BN67

During the ECU reprogramming process, the progress will be displayed on the left side of the screen
(see screen below). Even if the reprogramming appears to have stalled or become frozen, do not exit
the program or disconnect the unit. Depending on the computer’s hardware, reprogramming may take
in excess of 5 minutes.

BN67

When the progress indicator reaches 100%, wait until YDT displays the “Reprogramming completed”
message as shown below before proceeding to the next step.

Page 4 of 6

BN67

Once the “reprogramming completed” message displays, confirm the Reprogram date changed from
“00…” to the actual date (formatted YYYYMMDD) on the before/after reprogramming chart as shown
below.

BN67

4.

Turn the key off, then on again. Re-establish the connection to the vehicle using YDT. From the Select
Function menu, enter “Diagnosis of malfunction,” and erase any fault/event codes that are present.

TIP: If the key is not switched off / on again before attempting the clear the trouble codes, the codes will
not be able to be erased.
Page 5 of 6

No parts are required to perform this modification.
The ECU’s part number will supersede at a later date. Once this supersession takes place, the new part will
be supplied with this updated software pre-installed.

Service of all affected units is authorized regardless of warranty status.
After completion, select Campaign Number 090ZA from the Campaign Number pull-down menu in the
Yamaha Dealer System (YDS) when entering your claim. The labor allowance for this repair is 0.2 hour.
This Service-per-Bulletin 90 Code (090ZA) will only be valid for 1 year from date of issue of this Technical
Bulletin and will expire 8/10/2019.

ENTER CAMPAIGN CODE (090ZA) HERE

If you have any questions about proper procedures for Factory Modification Campaigns, see Chapter 7 in
your Warranty and Y.E.S. Handbook (LIT-11760-00-16).

Page 6 of 6