NHTSA ID Number: 10234869
Manufacturer Communication Number: MSA5P1926C
TSB/Document Date: 2023-04-24
Summary
New Technology Training
PULLEY WRENCH
PIN SET
• Used for removing and installing exhaust cam
sprocket.
• Used together with PULLEY WRENCH
(18355AA000) and PULLEY WRENCH PIN SET
(18334AA020).
ST 1
ST18355AA000
ST 2
ST3
ST2
ST18334AA040
18334AA020
PULLEY WRENCH
PIN SET
ST 3
• Used for removing and installing cam sprocket.
• Used for rotating the intake cam sprocket LH.
• Used together with PULLEY WRENCH
(18355AA000).
• Used with the PULLEY WRENCH PIN SET
(18334AA040) when removing and installing the
exhaust cam sprocket.
ST2
ST1
10-5
ST18334AA020
10-6
Cam Sprocket Tools
Valve Adjustment
The valves, valve springs, rocker arms, and rocker arm pivots have been refined to reduce
mechanical noise. The valve adjustment formulas have also changed.
A
B
S: Valve shim thickness
2014 DIT FA 2.0 liter formula
required
Intake side: S = T + 1.54 x (V - 0.13 mm (0.00051 in))
Exhaust side: S= T +1.69 x (V - 0.22 mm (0.0087 in)) V: Measured cam
clearance
2015 DIT / FB 2.5 liter formula
T: Current valve
Intake side: S = T + 1.69 x (V - 0.13 mm (0.00051 in))
shim thickness
Exhaust side: S = T +1.87 x (V - 0.22 mm (0.0087 in))
10-7
Valve Adjustment
Cylinder Head
The intake ports of the cylinder head has a new shape that produces increased air flow and tumble
to improve fuel economy and performance.
2015MY
2014MY
10-8
Cylinder Head Ports
156
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Intake Manifold & Tumble Generating Valves (TGV)
The construction of the TGVs has been changed from aluminum to resin. The TGVs are now
integrated to the upper intake manifold.
10-9
10-10
TGVs
Intake Manifold Exploded View
The TGV port tract has also been changed to promote increased tumble. When the valve Is closed
on the new configuration, air is forced toward the center of the engine instead of the outside.
2015MY
2014MY
10-11
TGV Flow
157
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Exhaust Manifold
The Exhaust Manifold has been redesigned with new routing and larger diameter piping to improve
catalytic converter function while reducing overall weight.
10-12
FB 2.5 Exhaust Manifold
2014MY
2015MY
10-13
FB 2.5 Exhaust Manifold Change
Exhaust Gasket
The gasket for the connection between the muffler
and the rear exhaust pipe has been changed
to a ring type.
10-14
Muffler
Gasket
158
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Fuel Pipe
To improve crash safety, the connection point of the fuel delivery line at the intake manifold has
been changed. Additionally, a new quick disconnect that may be released with or without the use
of a SST has been used.
2015MY
2014MY
10-15
Fuel Line Relocation
10-17
10-16
Fuel Supply Line
Fuel Line Connection
Exercise caution in removing the quick disconnect with or without the ST. Please also remember
not to kink the fuel delivery line as it may cause internal damage.
Note:
Always properly relieve fuel pressure
before attempting to remove fuel lines as
they may be under pressure.
ST
10-18
Quick Disconnect Removal
159
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Ignition Coil
The ignition coil connectors have been changed to a spring lock type to improve reliability.
10-19
Ignition Coil Connector![]()
10-20
10-21
Ignition Coil Connector
(Artwork)
EGR Cooler
The EGR Cooler has been separated from the engine coolant crossover and replaced with an
external high-efficiency unit. This results in higher rate of exhaust gas recirculation producing
improved combustion efficiency and fuel efficiency.
10-22
10-23
EGR Cooler
160
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Evaporative Emissions
An Evaporative Leak Check Module is used for the 2015 Legacy and Outback. The internal structure
of the canister has been improved to a honeycomb type, but functionality remains the same.
10-25
10-24
Evaporative Emissions System
Canister And ELCM
To: Canister
Purge
Solenoid (CPC)
10-26
Hose
Routing
To:
Fuel Tank
10-27
10-28
Hose
Routing
To: Drain
Separator
Connection Points
161
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
The shape and location of the drain separator has changed. It must be unbolted from the body
before the vent can be inspected or accessed for evaporative system diagnostics.
10-29
10-30
Drain Separator Removed
Drain Separator Location
A new connector
is used for the drain separator hose
. Use caution when releasing the tab.
10-31
Drain Separator Connector![]()
10-33
10-32
Connection Tabs Depressed
Connector
Lock Removed
162
10-34
Connector
Disconnected
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
The vent line from the filler neck passes through the body, into the rear cargo area, through the
floor, and finally into the fuel tank.
10-35
Filler Neck Vent Line
10-36
Vent Line Interior Cover Panel
10-37
Vent Line Pass Through
163
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
EZ 3.6 Changes
The EZ 3.6 engine for the 2015 Legacy and Outback is based on same proven platform used in
previous model years producing 256 horsepower and 247 lb-ft peak torque. The EZ 3.6 has been
adapted to function with the Generation 1 High-torque CVT (TR69) while maintaining the same
environmental performance and fuel consumption of the original EZ 3.6 engine. Internally, the
connecting rods have been manufactured with new materials and greater precision and a lower
opening temperature (from 82C to 78C) thermostat has been installed.
10-38
EZ 3.6
The V-belt for the EZ 3.6 has been redesigned due to the elimination of the conventional power
steering system. A new manual tensioner is now used.
Key groove
Nut
Shaft
10-40
10-39
EZ 3.6 V-belt
Inspection of the V-belt can be performed using a Sonic Belt Tension (Acoustic Belt Tension)
10-41
Sonic Belt Tension Gauge
164
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Place the microphone of the Sonic Belt Tension gauge within close proximity of the V-belt and
firmly pluck the V-belt in the center of the top length.
10-43
10-42
Belt Tension Gauge Positioned
V-belt Plucked
Repeat three times to obtain an average and compare to Subaru
service manual specifications.
10-44
1st Sample
10-46
10-45
2nd Sample
3rd Sample
EXAMPLE: V-belt tension (with Sonic belt tension gauge):
When installing new parts
1080 — 1230 N (110 — 125 kgf, 243 — 277 lbf)
337 — 360 Hz (frequency)
At inspection
570 — 720 N (58 — 73 kgf, 128 — 162 lbf)
245 — 275 Hz (frequency)
NOTE: Always refer to the correct Subaru
Service Manual on STIS.
165
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Service & Diagnostics
For FB 2.5 and EZ 3.6 models the Engine Control Module is located in the engine compartment
along the passenger side inner body panel.
10-47
ECM Location
The small black rubber button, indicated by the arrow, allows the ECM to sample atmospheric
pressure. Never Press this button as this may damage the waterproofing characteristics of the vent.
10-48
ECM Atmospheric Vent
166
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
SST Check Boards
Engine diagnostics are now performed using new SSTs 18460AA050-A and 18460AA050-B.
10-49
10-50
Check Board Harness
SST Identification
Ensure the hinge locks are fully seated before beginning diagnostics.
10-51
Check Board Harness Installation
10-52
10-53
Check Board Harness Unlocked
Check Board Harness Locked
167
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Engine Support Bridge
Engine Support Bridge
A new configuration of the existing SST J-50135 (Engine Support Bridge) has been adapted for
the 2015 Legacy and Outback.
10-54
Engine Support Bridge
Remove the air inlet, ducting, and alternator cover.
10-55
10-56
Engine Covers Installed
Engine Covers Removed
Prepare the mount adapters on the exposed threads of the upper strut mount.
10-58
10-57
Upper Strut Mount Exposed Threads
Mount Adapters Installed
168
June 2014
2015 Legacy and Outback
New Technology Training
(Module 926)
Remove the center rubber strut caps and prepare the lateral bar supports as shown.
10-59
Rubber Strut Cap Installed
10-60
Rubber Strut Cap Removed
10-61
Lateral Bar Supports Installed
Install the Lateral Bar
10-62
Lateral Bar Installed
Prepare new SSTs J-51658 (Engine Bridge Adapter Kit) and place through the provided openings
in the upper radiator garnish. Install the Stanchions with the rubber side facing up.
10-63
Prototype SSTs J-51658
Note:
Prototypes shown. Actual Tools may vary.
169
June 2014
2015 Legacy and Outback
New Technology Training
Note:
10-66
10-65
10-64
Radiator Garnish Opening
(Module 926)
Adaptor Installed
Stanchion Installed
SSTs J-50135-5 (Long Stanchions) are used for this procedure. These SSTs are
currently used as part of the BRZ Engine Support Bridge.
Install the longitudinal bars and posts.
10-67
10-68
RH Longitudinal Bar Installed
LH Longitudinal Bar Installed
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TSB/Document ID: MSA5P1926C
Replacement Service Bulletin Number:
MFR Communication Date: 2014-06-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: COMMUNICATION:MANUFACTURER TELEMATICS
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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