Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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)

GENERAL DESCRIPTION

GD(H4DOTC)

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

10.

Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .48

11.

Inspection Mode . . . . . . . . . . . . . . . . . . . . . ...49

12.

Drive Cycle . . . . . . . . . . . . . . . . . . . . . . . ...55

13.

Clear Memory Mode . . . . . . . . . . . . . . . . . . . . .63

14.

Compulsory Valve Operation Check Mode . . . . . . . . . . . ..64

15.

System Operation Check Mode . . . . . . . . . . . . . . . ...65

16.

Malfunction Indicator Light . . . . . . . . . . . . . . . . . ...67

17.

Diagnostics for Engine Starting Failure . . . . . . . . . . . . . 74

18.

Diagnostic Procedure for Subaru Select Monitor Communication . . ...85

19.

List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . 87

20.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . 96

21.

Diagnostic Procedure without Diagnostic Trouble Code (DTC) . . . .466

22.

General Diagnostic Table . . . . . . . . . . . . . . . . . ...471

EN(H4DOTC)(diag)-2

Basic Diagnostic Procedure

ENGINE (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE

1. ENGINE

Step

Check

Yes

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?

Go to step

Inspection using
“Diagnostics for
Engine Starting
Failure”. <Ref. to
EN(H4DOTC)(diag)
-74, Diagnostics for
Engine Starting
Failure.>

CHECK ILLUMINATION OF MALFUNCTION
INDICATOR LIGHT.

Does the malfunction indicator
light illuminate?

Go to step

Inspection using
“General Diagnostic
Table”. <Ref. to
EN(H4DOTC)(diag)
-471, General Diag-
nostic Table.>

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?

Go to step

Inspection using
“Diagnostic Proce-
dure for Subaru
Select Monitor
Communication”.
<Ref. to
EN(H4DOTC)(diag)
-85, Diagnostic Pro-
cedure for Subaru
Select Monitor
Communication.>

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?

Record DTC and
freeze frame data,
then repair the trou-
ble cause. <Ref. to
EN(H4DOTC)(diag)
-87, List of Diagnos-
tic Trouble Code
(DTC).> After
repair, go to the next
step. Go to step

Repair the related
parts.
NOTE:

If DTC is not
shown on display
although the mal-
function indicator
light

illuminates,

perform the diag-
nosis of malfunc-
tion indicator light
circuit or combina-
tion meter. <Ref. to
EN(H4DOTC)(di-
ag)-67, Malfunc-
tion