16-132-20R

ATTENTION:
GENERAL MANAGER
q
PARTS MANAGER
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CLAIMS PERSONNEL
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IMPORTANT - All
Service Personnel
Should Read and
Initial in the boxes
provided, right.
SERVICE MANAGER
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© 2020 Subaru of America, Inc. All rights reserved.
SERVICE BULLETIN
APPLICABILITY:
		
		
		
		
2018-22MY Legacy and Outback
2017-22MY Impreza
2018-22MY Crosstrek
2019-22MY Forester
2019-22MY Ascent
NUMBER: 16-132-20R
SUBJECT:
		
Diagnostic Information for Alleged Chain Slip Condition
on TR580 / TR690 Transmissions
DATE: 12/18/20
REVISED: 02/08/22
INTRODUCTION:
This Service Information Bulletin provides updated diagnostic procedures to follow and a brief
questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690
model CVT transmissions used in the models listed above. In some cases, the customer may have
had a concern of hearing an abnormal sound and / or felt an unusual vibration while driving. This
information is intended to provide Technicians a user-friendly procedure which will help to ensure an
accurate diagnosis and reduce the possibility of unnecessary CVT replacements.
SERVICE PROCEDURE / INFORMATION:
Customer satisfaction and retention starts with performing quality repairs.
After completing the questionnaire located at the end of the Troubleshooting section, following the
diagnostic procedures supplied in this bulletin and when determined necessary, service procedures for
CVT and / or TCM replacement remain unchanged. Always refer to the applicable Service Manual
and review the full requirements of the repair being performed. The Service Manual procedures
contain information critical to performing an effective repair the first time, every time. This includes
but is not limited to important SAFETY precautions, proper inspection criteria, necessary special
tools, required processes and related one-time-use parts needed for a complete and lasting repair.
VERY IMPORTANT: With any customer concern, it is important to get a complete and detailed
description from them so their condition can be duplicated. Duplicating the condition is critical for
a proper diagnosis and successful repair. Whenever using this TSB for alleged CVT Chain Slip
diagnosis, Technicians are required to submit a completed QMR which includes all Flow Chart
test results, SSM data and a COMPLETED copy of the questionnaire found on pg. 11. This
information will be extremely helpful for SBR Engineers when analyzing what the customer was
experiencing as Chain Slip. Cooperation with this special information request is greatly appreciated!
CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD
RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS.
Subaru Service Bulletins are intended for use by professional technicians ONLY. They
are written to inform those technicians of conditions that may occur in some vehicles,
or to provide information that could assist in the proper servicing of the vehicle. Properly
trained technicians have the equipment, tools, safety instructions, and know-how to
do the job correctly and safely. If a condition is described, DO NOT assume that this
Service Bulletin applies to your vehicle, or that your vehicle will have that condition.
Subaru of America, Inc. is
ISO 14001 Compliant
ISO 14001 is the international standard for
excellence in Environmental Management
Systems. Please recycle or dispose of
automotive products in a manner that is friendly
to our environment and in accordance with all
local, state and federal laws and regulations.
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 1 of 12
Troubleshooting Flow Chart for Alleged CVT Chain Slip:
Chain slip** is occuring.
Replace the CVT Assy
Engine and Primary Pulley
Speeds Overlap in this Graph
Gear Ratio
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 2 of 12
Engine Speed (rpm) Primary Pulley Speed (rpm)
Example screenshot of TCM PIDS with Front Wheel Speed and Secondary Revolution Speed
selected.
Engine Speed
Primary Pulley Speed
Secondary Pulley Speed
Front Wheel Speed
Gear Ratio
Times (s)
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 3 of 12
follow the Primary Pulley
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 4 of 12
Does
the condition
occur during up shift
(up ratio) or down shift (down ratio)?
FIG.55 for
See FIG.
FIG.44 & FIG.
FIG. 5
details.
FIG. 6
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 5 of 12
FIG. 5
Does the
condition occur right
before or after the lock-up operaFIG.77 for
tion? See FIG.
example.
Record and analyze the
Engine SSM data to determine
if the torque fluctuation is being
caused by the engine.
See
forFIG.
example.
See Fig.
FIG. 68 &
for
9 example.
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 6 of 12
FIG. 6
FIG. 7
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 7 of 12
FIG. 8
The graph above is an example of recorded SSM data showing the torque fluctuation is
NOT being caused by the transmission but by torque fluctuation of the engine.
FIG. 9
Bulletin Number: 16-132-20R; Revised: 02/08/22
Continued...
Page 8 of 12
WARRANTY / CLAIM INFORMATION:
NOTE: ALWAYS confirm and verify the specific vehicle Warranty coverage prior to performing any
work to the vehicle.
For vehicles within the Basic New Car Limited Warranty period Powertrain Limited Warranty or
covered by an active Subaru Added Security Powertrain, Classic or Gold plan, this repair may be
submitted using the following claim information:
Diagnostic Claim Information
Labor Description
Labor Operation #
Labor Time
DTC Check / 1st Road Test / Data Analysis
/ STEP 1 / Data Analysis
C303-715
1.3H
STEP 2-1 / Data Analysis
C303-716
1.4H
STEP 2-2 / Data Analysis
C303-717
1.5H
STEP 2-3 / Data Analysis
C303-718
1.7H
^
^INCLUDED IN EACH
Final Road Test
QMR & Questionnaire Completion
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 9 of 12
The diagnostic claim information listed ABOVE is to be used with in conjunction with the labor
claim information listed BELOW.
ONLY one labor operation from the above list can be used with an associated repair listed below.
Labor Claim Information
Labor Description
Labor Operation #
Fail Code
REMANUFACTURED TRANSMISSION R&R
4AT/5AT/CVT/3AT
B139-301
TMA/TMB
NEW CV TRANSMISSION ASSEMBLY
REPLACE
B303-091
MQJ24
PERFORM AUTO TRANS LEARNING
CONTROL PROCEDURE
B383-108
MFC42
TRANSMISSION CONTROL MODULE R&R
B860-731
MJT42
NOTE: Labor times will vary depending on model. Always refer to the Warranty Labor Time Guide.
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 10 of 12
Questionnaire for Alleged CVT Chain Slip Condition
Please use all applicable check boxes.
vehicle speed box.
Please enter a number value in
Please attach SSM data files for both before and after pre- and post-repair.
No.
Item
1
CVT Temperature
2
Location
3
Vehicle Speed
4
Condition:
Immediately after starting the engine
Highway
Vehicle Used for
Towing?
6
Frequency of Slip
Condition
7
How Long Has
Condition Been
Occurring?
Symptoms:
Warming-up
Paved-road
After warming-up
Rough-road
mph
Driving Condition
5
8
Answer
While accelerating
While decelerating
Yes
Only once
A few times
It just started
While cruising
No
Intermittent
Within the last month
Always
From new
Noise
Vibration
Shock/Bump
Hesitation/Surge
Shudder
Jerking/Bucking
Engine RPM rise/flare
Lack of power / not accelerate
Deceleration feeling
Engine RPM not rise
Engine RPM fluctuation / hunting gear
Other (please describe:)
T/M assy replacement
T/M part(s) replacement
AT relearn / torque converter relearn
9
Repair(s):
TCM Re-programing
No repair made (inspection only)
Other (please describe:)
Example: Satisfaction / dissatisfaction level, further improvement requirements.
10
Customer Comments Post-Repair:
Continued...
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 11 of 12
IMPORTANT REMINDERS:
•
SOA strongly discourages the printing and/or local storage of service information as previously
released information and electronic publications may be updated at any time.
•
Always check for any open recalls or campaigns anytime a vehicle is in for servicing.
•
Always refer to STIS for the latest service information before performing any repairs.
Bulletin Number: 16-132-20R; Revised: 02/08/22
Page 12 of 12