Diagnostics - Subaru Legacy 2015 Technicians Reference Booklet

2015 Legacy and Outback

Diagnostics

Since the Control Unit has been incorporated into the Gear Box assembly, diagnostics have been
simplified. Resolver and U, V, W Motor Winding related diagnostics are no longer necessary as
any faults relating to these components will require a Gear Box assembly replacement.
Inspect harness for
possible damage.
Replace if necessary. If
harness is OK, Torque
Sensor or control Unit
has failed. Replace the
Gear Box assembly.
Replacement of Gear Box
Assembly is necessary.
New Technology Training
DTC Item
Without DTC
"Assist limitation" is displayed
in the current data «EPS
None operating condition».
"Overheating protection inter-
vention history" in current
data display shows 1 or
more.
Torque Sensor Failure 1
C2511
(Main)
Torque Sensor Failure 2
C2512
(Sub)
Torque Sensor Failure 3
C2513
(Much Tolerance)
Torque Sensor Power Sup-
C2514
ply Failure
C2521 Motor Failure 1 (Motor)
Motor Malfunction 2
C2522
(Resolver)
C2531 ECU Failure 1 (CPU Failure)
ECU Failure 2 (Peripheral
C2532
Circuit Failure)
ECM Failure 3 (Board Tem-
C2533
perature Sensor Failure)
151
(Module 926)
Content of diagnosis
Normal
Assist limitation is performed
due to overheat protection
control.
There are previous records of
intervention to overheat pro-
tection control.
• Poor connector contact
• Forgot to connect connec-
tor
• Faulty torque sensor sec-
tion circuit
• Faulty torque sensor coil
• Poor connector contact
• Forgot to connect connec-
tor
• Harness open/short circuit
• Motor open circuit
• Power transistor shorted/
open
• Terminal power supply or
ground short
Faulty main unit of power
steering control module
Faulty main unit of power
steering control module
Faulty main unit of power
steering control module
June 2014