Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 194
2014 IMPREZA WRX STI SERVICE MANUAL
QUICK REFERENCE INDEX
FUJI HEAVY INDUSTRIES LTD.
G1180BE4
ENGINE 3 SECTION
This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.
ENGINE (DIAGNOSTICS)
EN(H4DOTC)(diag)
Page
Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . ...2
Check List for Interview . . . . . . . . . . . . . . . . . . . ..4
General Description . . . . . . . . . . . . . . . . . . . . ...6
Electrical Component Location . . . . . . . . . . . . . . . . ..9
Engine Control Module (ECM) I/O Signal . . . . . . . . . . . . 23
Engine Condition Data . . . . . . . . . . . . . . . . . . . .33
Data Link Connector . . . . . . . . . . . . . . . . . . . . 34
General Scan Tool . . . . . . . . . . . . . . . . . . . . ...35
Subaru Select Monitor . . . . . . . . . . . . . . . . . . . ..40
Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .48
Inspection Mode . . . . . . . . . . . . . . . . . . . . . ...49
Drive Cycle . . . . . . . . . . . . . . . . . . . . . . . ...55
Clear Memory Mode . . . . . . . . . . . . . . . . . . . . .63
Compulsory Valve Operation Check Mode . . . . . . . . . . . ..64
System Operation Check Mode . . . . . . . . . . . . . . . ...65
Malfunction Indicator Light . . . . . . . . . . . . . . . . . ...67
Diagnostics for Engine Starting Failure . . . . . . . . . . . . . 74
Diagnostic Procedure for Subaru Select Monitor Communication . . ...85
List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . 87
Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . 96
Diagnostic Procedure without Diagnostic Trouble Code (DTC) . . . .466
General Diagnostic Table . . . . . . . . . . . . . . . . . ...471
EN(H4DOTC)(diag)-2
Basic Diagnostic Procedure
ENGINE (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
1. ENGINE
Step
Check
Yes
No
1
CHECK ENGINE START FAILURE.
1) Ask the customer when and how the trouble
occurred using the interview check list. <Ref. to
EN(H4DOTC)(diag)-4, CHECK, Check List for
Interview.>
2) Start the engine.
Does the engine start?
2
CHECK ILLUMINATION OF MALFUNCTION
INDICATOR LIGHT.
Does the malfunction indicator
light illuminate?
3
CHECK COMMUNICATION STATUS.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor or gen-
eral scan tool to the data link connector.
3) Turn the ignition switch to ON, and run the
Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed procedures, refer to “Subaru Select
Monitor”. <Ref. to EN(H4DOTC)(diag)-40, Sub-
aru Select Monitor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Does Subaru Select Monitor or
general scan tool communicate
with vehicle normally?
4
CHECK DTC.
Read DTC using Subaru Select Monitor or gen-
eral scan tool.
NOTE:
• Subaru Select Monitor
Refer to “Read Diagnostic Trouble Code (DTC)”
for detailed operation procedure. <Ref. to
EN(H4DOTC)(diag)-48, Read Diagnostic Trou-
ble Code (DTC).>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Is DTC displayed on Subaru
Select Monitor or general scan
tool?
Repair the related
parts.
NOTE:
If DTC is not
shown on display
although the mal-
function indicator
light
EN(H4DOTC)(diag)-3
Basic Diagnostic Procedure
ENGINE (DIAGNOSTICS)
5
Is DTC displayed on Subaru
Select Monitor or general scan
tool?
Finish the diagno-
sis.
Step
Check
Yes
No
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