Subaru Legacy IV (2008 year). Service manual - part 295

SC(H4DOTC)-2

General Description

STARTING/CHARGING SYSTEMS

1. General Description

A: SPECIFICATION

Specifications for the turbo model are included in
the SC (H4SO) section. <Ref. to SC(H4SO)-2,
General Description.>

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 checklist. <Ref. to 
EN(H4DOTC)(diag)-3, CHECK, Check List for 
Interview.>
2) Start the engine.

Does the engine start?

Go to step 2.

Inspection using 
Diagnostics for 
Engine Start Fail-
ure. <Ref. to 
EN(H4DOTC)(diag)
-66, Diagnostics 
for Engine Starting 
Failure.>

2

CHECK ILLUMINATION OF MALFUNCTION 
INDICATOR LIGHT.

Does the malfunction indicator 
light illuminate?

Go to step 3.

Inspection using 
“General Diagnos-
tic Table” <Ref. to 
EN(H4DOTC)(diag)
-370, General 
Diagnostic Table.>

3

CHECK THE 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)-34, 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 4.

Inspection using 
“Diagnostics Pro-
cedure for Subaru 
Select Monitor 
Communication”. 
<Ref. to 
EN(H4DOTC)(diag)
-79, Diagnostic 
Procedure for Sub-
aru Select Monitor 
Communication.>

4

CHECK DTC.
Read DTC using Subaru Select Monitor or gen-
eral scan tool.

NOTE:
• SUBARU SELECT MONITOR
Refer to “Read Diagnostic Trouble Code” for
detailed operation procedure. <Ref. to
EN(H4DOTC)(diag)-42, 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 the Subaru 
Select Monitor or general scan 
tool?

Record the DTC. 
Repair the trouble 
cause. <Ref. to 
EN(H4DOTC)(diag)
-81, List of Diag-
nostic Trouble 
Code (DTC).> Go 
to step 5.

Repair the related 
parts.

NOTE:
If DTC is not shown
on display although
the malfunction in-
dicator light illumi-
nates, perform the
diagnosis of mal-
function indicator
light circuit or com-
bination meter. 
<Ref. to 
EN(H4DOTC)(di-
ag)-57, Malfunction 
Indicator Light.>

5

PERFORM DIAGNOSIS.
1) Perform the Clear Memory Mode. <Ref. to 
EN(H4DOTC)(diag)-52, Clear Memory Mode.>
2) Perform the Inspection Mode. <Ref. to 
EN(H4DOTC)(diag)-43, Inspection Mode.>

Is DTC displayed on the Subaru 
Select Monitor or general scan 
tool?

Inspect using 
“Diagnostic Proce-
dure with Diagnos-
tic Trouble Code 
(DTC)”<Ref. to 
EN(H4DOTC)(diag)
-89, Diagnostic 
Procedure with 
Diagnostic Trouble 
Code (DTC).>

Finish the diagno-
sis.

EN(H4DOTC)(diag)-3

Check List for Interview

ENGINE (DIAGNOSTICS)

2. Check List for Interview

A: CHECK

1. CHECK LIST NO. 1

Check the following item when problem has occurred.

NOTE:
Use copies of this page for interviewing customers.

Customer’s name

 

Engine No.

 

Date of purchase

 

Fuel brand

 

Date of repair

 

Odometer reading

km

V.I.N.

 

miles

Weather

 Fine
 Cloudy
 Rainy
 Snowy
 Various/Others:

Ambient air temperature

°C (      °F)  

 Hot
 Warm
 Cool
 Cold

Place

 Highway
 Suburbs
 Inner city
 Uphill
 Downhill
 Rough road
 Others:

Engine temperature

 Cold
 Warming-up
 After warming-up
 Any temperature
 Others:

Engine speed

rpm  

Vehicle speed

km/h (MPH)  

Driving conditions

 Not affected
 At starting
 While idling
 At racing
 While accelerating
 While cruising
 While decelerating
 While turning (RH/LH)

Headlight

 ON/

 OFF

Rear defogger

 ON/

 OFF

Blower

 ON/

 OFF

Audio

 ON/

 OFF

A/C compressor

 ON/

 OFF

CD/Cassette

 ON/

 OFF

Radiator fan

 ON/

 OFF

Car phone

 ON/

 OFF

Front wiper

 ON/

 OFF

Wireless device

 ON/

 OFF

Rear wiper

 ON/

 OFF

 

EN(H4DOTC)(diag)-4

Check List for Interview

ENGINE (DIAGNOSTICS)

2. CHECK LIST NO. 2

Check the following item about the vehicle’s state when malfunction indicator light illuminates.

NOTE:
Use copies of this page for interviewing customers.

a) Other warning lights or indicators turn on. 

 Yes / 

 No

 Low fuel warning light
 Charge indicator light
 Engine coolant temperature indicator light
 Oil pressure warning light
 ATF temperature indicator light or SPORT indicator light
 Drivers control center differential indicator light
 ABS warning light
 VDC warning light
 Cruise indicator light
 SI-CRUISE warning light
 Immobilizer indicator light
 STEERING indicator light
 Glow indicator
 Sedimentor warning light
 Others:

b) Fuel level

• Lack of gasoline: 

 Yes / 

 No

• Indicator position of fuel gauge:
• Experienced running out of fuel: 

 Yes / 

 No

c) Intentional connecting or disconnecting of harness connectors or spark plug cords: 

 Yes / 

 No

• What:

d) Intentional connecting or disconnecting of hoses: 

 Yes / 

 No

• What:

e) Installing of parts other than genuine parts: 

 Yes / 

 No

• What:
• Where:

f) Occurrence of noise: 

 Yes / 

 No

• From where:
• What kind:

g) Occurrence of smell: 

 Yes / 

 No

• From where:
• What kind:

h) Intrusion of water into engine compartment or passenger compartment: 

 Yes / 

 No

i) Troubles occurred

 Engine does not start.
 Engine stalls during idling.
 Engine stalls while driving.
 Engine speed decreases.
 Engine speed does not decrease.
 Rough idling
 Poor acceleration
 Back fire
 After fire
 Does not shift.
 Excessive shift shock