18-212-21

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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© 2021 Subaru of America, Inc. All rights reserved.
SERVICE BULLETIN
APPLICABILITY:
2019-21MY Ascent
NUMBER:
		 2011-14MY Tribeca
DATE:
18-212-21
07/29/21
		 2009-2020MY WRX & STI
		
SUBJECT:
Service Manual Corrections
INTRODUCTION
The purpose of this bulletin is to provide a description of current changes to Service Manuals
available via the Subaru Technical Information System (STIS) web site. The tables contained within
this bulletin are to be used as guides for becoming aware of the latest changes. We advise you to
always refer to the STIS web site when looking for the latest Service information. Printed pages will
not be made available to update printed Service Manuals.
Paper manuals may have different page numbering then what is reflected below, based on
multiple new and revised pages. Please refer to the information contained on the STIS web site
for all future, update service manual information.
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: 18-211-21; Date: 07/29/21
Page 1 of 7
YEAR
MODEL
SECTION
SUB-SECTION
PAGE or CHAPTER
DESCRIPTION OF CHANGE
Body &
Electrical/Wiring
System
Sunroof
Sunroof Control
System >Inspection
"Malfunction of automatic
operation" symptom was added
with inspection steps
Data Monitor >List
SRH Setup Status was added
Diag w/ Phenomenon
>Inspection >Auto
Headlight Beam
Leveler Does Not
Operate
Some TT steps were changed and
deleted
Airbag Diag
Diagnostic Procedure
w/ DTC >DTC B19EF
>DTC B19F4 >DTC
B19F5 >DTC B19F6
>DTC B19F7
Some TT steps were changed
Front Suspension
General Description
>Component >Front
Suspension
Stud Bolt was changed to one time
use when removed
Rear Suspension
General Description
>Component >Rear
Suspension
Rear Suspension Illustrations were
changed
Engine
Fuel Injection
ECM >Installation
Immobilizer Description was
changed
Body &
Electrical/Wiring
System
Sunroof
Sunroof Control System
>Inspection
"Malfunction of automatic
operation" symptom was added
with inspection steps
Data Monitor >List
SRH Setup Status was added
Diag w/ Phenomenon
>Inspection >Auto
Headlight Beam
Leveler Does Not
Operate
Some TT steps were changed and
deleted
Airbag Diag
Diagnostic Procedure
w/ DTC >DTC B19EF
>DTC B19F4 >DTC
B19F5 >DTC B19F6
>DTC B19F7
Some TT steps were changed
Suspension
Front Suspension
General Description
>Component >Front
Suspension
Stud Bolt was changed to one time
use when removed
Engine
Fuel Injection
ECM >Installation
Immobilizer Description was
changed
Headlight / Foglight Diag
Diagnostics
2019
Ascent
Suspension
Headlight / Foglight Diag
Diagnostics
2020
Ascent
Bulletin Number: 18-211-21; Date: 07/29/21
Page 2 of 7
YEAR
MODEL
SECTION
SUB-SECTION
PAGE or CHAPTER
DESCRIPTION OF CHANGE
Body &
Electrical/Wiring
System
Sunroof
Sunroof Control System
>Inspection
"Malfunction of automatic
operation" symptom was added
with inspection steps
Data Monitor >List
SRH Setup Status was added
Diag w/ Phenomenon
>Inspection >Auto
Headlight Beam
Leveler Does Not
Operate
Some TT steps were changed and
deleted
Infotainment Diag
Diag w/ Phenomenon
>Inspection
A TT step was deleted
Airbag Diag
Diagnostic Procedure
w/ DTC >DTC B19EF
>DTC B19F4 >DTC
B19F5 >DTC B19F6
>DTC B19F7
Some TT steps were changed
Emission Control
Leak Check Valve Assy
>Inspection >Check
Vacuum Pump >Check
Pressure Sensor
A caution was added to "Check
Vacuum Pump" and an item was
deleted from "Check Pressure
Sensor"
Fuel Injection
ECM >Installation
Immobilizer Description and
Installation Steps were changed
Body & Electrical/
Wiring System
Seats
General Description
>Component >Front
Seat
Some front seat image
descriptions were changed
Suspension
Front Suspension
General Description
>Component >Front
Suspension
Stud Bolt was changed to one time
use when removed
FU (H6DO)
Throttle Body
FU (H6DO) 19, 20
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (H6DO)
Accelerator Pedal
SP (H6DO) 5
>Inspection,
Accelerator Pedal
A helpful note was added
FU (H6DO)
Throttle Body
FU (H6DO) 20, 21
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (H6DO)
Accelerator Pedal
SP (H6DO) 5
>Inspection,
Accelerator Pedal
A helpful note was added
FU (H6DO)
Throttle Body
FU (H6DO) 20, 21
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (H6DO)
Accelerator Pedal
SP (H6DO) 5
>Inspection,
Accelerator Pedal
A helpful note was added
FU (H6DO)
Throttle Body
FU (H6DO) 20, 21
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (H6DO)
Accelerator Pedal
SP (H6DO) 5
>Inspection,
Accelerator Pedal
A helpful note was added
Headlight / Foglight Diag
Diagnostics
2021
Ascent
Engine
2011
2012
2013
2014
Tribeca
Tribeca
Tribeca
Tribeca
Continued...
Bulletin Number: 18-211-21; Date: 07/29/21
Page 3 of 7
YEAR
2009
2010
MODEL
SECTION
SUB-SECTION
PAGE or CHAPTER
DESCRIPTION OF CHANGE
FU (STI)
Throttle Body
FU (STI) 15,16
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (STI)
Accelerator Pedal
SP (STI) 5 >Inspection,
Accelerator Pedal
A helpful note was added
FU (STI)
Throttle Body
FU (STI) 15,16
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (STI)
Accelerator Pedal
SP (STI) 5 >Inspection,
Accelerator Pedal
A helpful note was added
FU (STI)
Throttle Body
FU (STI) 15,16
>Inspection, Throttle
Sensor
Notes were added and the throttle
inspection instructions and PID
description were changed
SP (STI)
Accelerator Pedal
SP (STI) 5 >Inspection,
Accelerator Pedal
A helpful note was added
FU (w/o STI)
Throttle Body
FU (w/o STI) 16
Notes were added and the throttle
inspection instructions and PID
description were changed
Fuel Injection (STI)
Throttle Body
>Inspection >Throttle
Sensor Inspection
Notes were added and the throttle
inspection instructions and PID
description were changed
Speed Control Systems (STI)
Accelerator Pedal
>Inspection >Check
Accelerator Pedal
Sensor Area
A helpful note was added
Fuel Injection (w/o STI)
Throttle Body
>Inspection >Throttle
Sensor Inspection
Notes were added and the throttle
inspection instructions and PID
description were changed
Fuel Injection (STI)
Throttle Body
>Inspection >Throttle
Sensor Inspection
Notes were added and the throttle
inspection instructions and PID
description were changed
Speed Control Systems (STI)
Accelerator Pedal
>Inspection >Check
Accelerator Pedal
Sensor Area
A helpful note was added
Fuel Injection (w/o STI)
Throttle Body
>Inspection >Throttle
Sensor Inspection
Notes were added and the throttle
inspection instructions and PID
description were changed
Fuel Injection (STI)
Throttle Body
>Inspection >Throttle
Sensor Inspection
Notes were added and the throttle
inspection instructions and PID
description were changed
Speed Control Systems (STI)
Accelerator Pedal
>Inspection >Check
Accelerator Pedal
Sensor Area
A helpful note was added
Fuel Injection (w/o STI)
Throttle Body
>Inspection >Throttle
Sensor Inspection
Notes were added and the throttle
inspection instructions and PID
description were changed
STI
STI
STI
2011
WRX
STI
2012
Engine
WRX
STI
Engine
2013
WRX
STI
2014
Engine
WRX
Continued...
Bulletin Number: 18-211-21; Date: 07/29/21
Page 4 of 7
YEAR
2015
MODEL
WRX / STI
SECTION
Brakes
Body & Electrical/
Wiring System
2016
Brake
Security and Locks
WRX / STI
Brakes
Body & Electrical/
Wiring System
2017
SUB-SECTION
Brake
Security and Locks
WRX / STI
Brakes
Brake
PAGE or CHAPTER
DESCRIPTION OF CHANGE
Master Cylinder
>Installation
Installation instructions and
illustrations were changed
Brake Booster
>Installation
Installation instructions and
illustrations were changed
Stop Light Switch
>Installation
>Inspection
>Adjustment
Changes were made to the
installation, inspection, and
adjustment procedures
Function Setting
(Customize)
>Procedure >Stopping
KAS Function by Using
Access Key
A note about the secret code was
added
Master Cylinder
>Installation
Installation instructions and
illustrations were changed
Brake Booster
>Installation
Installation instructions and
illustrations were changed
Stop Light Switch
>Installation
>Inspection
>Adjustment
Changes were made to the
installation, inspection, and
adjustment procedures
Function Setting
(Customize)
>Procedure >Stopping
KAS Function by Using
Access Key
A note about the secret code was
added
Master Cylinder
>Installation
Installation instructions and
illustrations were changed
Brake Booster
>Installation
Installation instructions and
illustrations were changed
Stop Light Switch
>Installation
>Inspection
>Adjustment
Changes were made to the
installation, inspection, and
adjustment procedures
Continued...
Bulletin Number: 18-211-21; Date: 07/29/21
Page 5 of 7
YEAR
MODEL
SECTION
SUB-SECTION
PAGE or CHAPTER
DESCRIPTION OF CHANGE
Diagnostic Procedure
w/ DTC >DTC P0172
>DTC P0300 >DTC
P0304
Changes were made to "Check
PCV Valve" TT step
Diagnostic Procedure
w/ DTC >DTC P0172
>DTC P0300 >DTC
P0304
Changes were made to "Check
PCV Valve" TT step
Function Setting
(Customize)
>Procedure >Stopping
KAS Function by Using
Access Key
A note about the secret code was
added
Master Cylinder
>Installation
Installation instructions and
illustrations were changed
Brake Booster
>Installation
Installation instructions and
illustrations were changed
Stop Light Switch
>Installation
>Inspection
>Adjustment
Changes were made to the
installation, inspection, and
adjustment procedures
Engine Diag
Diagnostic Procedure
w/ DTC >DTC P0172
>DTC P0300 >DTC
P0304
Changes were made to "Check
PCV Valve" TT step
Engine Diag
Diagnostic Procedure
w/ DTC >DTC P0172
>DTC P0300 >DTC
P0304
Changes were made to "Check
PCV Valve" TT step
Security and Locks
Function Setting
(Customize)
>Procedure >Stopping
KAS Function by Using
Access Key
A note about the secret code was
added
Eyesight
Switches and Harness
>Inspection >Pre
Collision Brake Off
Switch and Lane
Departure Warning
Off Switch >Eyesight
Steering Switch
Inspection instructions,
illustrations, and table were
changed
Brakes
Brake
Master Cylinder
>Installation
Installation instructions and
illustrations were changed
Brakes
Brake
Brake Booster
>Installation
Installation instructions and
illustrations were changed
Brake
Stop Light Switch
>Installation
>Inspection
>Adjustment
Changes were made to the
installation, inspection, and
adjustment procedures
STI
Diagnostics
Engine Diag
WRX
Body & Electrical/
Wiring System
2018
Security and Locks
WRX / STI
Brakes
STI
Brake
Diagnostics
WRX
Body & Electrical/
Wiring System
2019
WRX / STI
Brakes
Continued...
Bulletin Number: 18-211-21; Date: 07/29/21
Page 6 of 7
YEAR
MODEL
SECTION
SUB-SECTION
PAGE or CHAPTER
DESCRIPTION OF CHANGE
Diagnostic Procedure
w/ DTC >DTC P0172
>DTC P0300 >DTC
P0304
Changes were made to "Check
PCV Valve" TT step
Diagnostic Procedure
w/ DTC >DTC P0172
>DTC P0300 >DTC
P0304
Changes were made to "Check
PCV Valve" TT step
Security and Locks
Function Setting
(Customize)
>Procedure >Stopping
KAS Function by Using
Access Key
A note about the secret code was
added
Eyesight
Switches and Harness
>Inspection >Pre
Collision Brake Off
Switch and Lane
Departure Warning
Off Switch >Eyesight
Steering Switch
Inspection instructions and
illustrations were changed
Master Cylinder
>Installation
Installation instructions and
illustrations were changed
Brake Booster
>Installation
Installation instructions and
illustrations were changed
Stop Light Switch
>Installation
>Inspection
>Adjustment
Changes were made to the
installation, inspection, and
adjustment procedures
STI
Diagnostics
Engine Diag
WRX
Body & Electrical/
Wiring System
2020
WRX / STI
Brakes
Bulletin Number: 18-211-21; Date: 07/29/21
Brake
Page 7 of 7