Subaru Legacy (2005 year). Service manual — part 179
ENGINE (DIAGNOSTICS)
EN(H4SO 2.5)(diag)
Page
Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . . 2
Check List for Interview. . . . . . . . . . . . . . . . . . . ...3
General Description . . . . . . . . . . . . . . . . . . . . . 5
Electrical Component Location . . . . . . . . . . . . . . . . ...8
Engine Control Module (ECM) I/O Signal . . . . . . . . . . . . .17
Engine Condition Data . . . . . . . . . . . . . . . . . . . ..21
Data Link Connector . . . . . . . . . . . . . . . . . . . . .22
General Scan Tool . . . . . . . . . . . . . . . . . . . . . 23
Subaru Select Monitor. . . . . . . . . . . . . . . . . . . ...25
Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . ..32
Inspection Mode. . . . . . . . . . . . . . . . . . . . . . 33
Drive Cycle. . . . . . . . . . . . . . . . . . . . . . . . 38
Clear Memory Mode. . . . . . . . . . . . . . . . . . . . ..40
Compulsory Valve Operation Check Mode . . . . . . . . . . . ...41
Malfunction Indicator Light . . . . . . . . . . . . . . . . . . 43
Diagnostics for Engine Starting Failure. . . . . . . . . . . . . .53
List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .69
Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . .78
General Diagnostic Table. . . . . . . . . . . . . . . . . . 257
EN(H4SO 2.5)(diag)-2
ENGINE (DIAGNOSTICS)
Basic Diagnostic Procedure
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 trou-
ble occurred using the interview check list.
<Ref. to EN(H4SO 2.5)(diag)-3, CHECK,
Check List for Interview.>
2) Start the engine.
Does the engine start?
Inspection using
“Diagnostics for
Engine Starting
Failure” <Ref. to
EN(H4SO
2.5)(diag)-53,
Diagnostics for
Engine Starting
Failure.>
2
CHECK ILLUMINATION OF MALFUNCTION
INDICATOR LIGHT.
Does the malfunction indicator
light illuminate?
Inspection using
“General Diagnos-
tic Table”. <Ref. to
EN(H4SO
2.5)(diag)-257,
INSPECTION,
General Diagnos-
tic Table.>
3
CHECK DTC.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor or gen-
eral scan tool to data link connector.
3) Turn the ignition switch to ON.
4) Read DTC using Subaru Select Monitor or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
“Read Diagnostic Trouble Code (DTC)”. <Ref.
to EN(H4SO 2.5)(diag)-32, Read Diagnostic
Trouble Code (DTC).>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is DTC displayed on the Sub-
aru Select Monitor or general
scan tool?
Record the DTC.
Repair the trouble
cause. <Ref. to
EN(H4SO
2.5)(diag)-69, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 4.
Repair the related
parts.
NOTE:
If DTC is not
shown on display
although the en-
gine warning light
illuminates, per-
form the diagnos-
tics of malfunction
indicator light cir-
cuit or combination
meter. <Ref. to
EN(H4SO 2.5)(di-
ag)-43, Malfunc-
tion Indicator
Light.>
4
PERFORM DIAGNOSIS.
1) Perform the clear memory mode. <Ref. to
EN(H4SO 2.5)(diag)-40, Clear Memory
Mode.>
2) Perform the inspection mode. <Ref. to
EN(H4SO 2.5)(diag)-33, Inspection Mode.>
Is DTC displayed on the Sub-
aru Select Monitor or general
scan tool?
Inspect using
“Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)”.
<Ref. to EN(H4SO
2.5)(diag)-78,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
Finish the diagno-
sis.
EN(H4SO 2.5)(diag)-3
ENGINE (DIAGNOSTICS)
Check List for Interview
2. Check List for Interview
A: CHECK
1. CHECK LIST No. 1
Check the following items when problem has occurred.
NOTE:
Use copies of this page for interviewing customers.
Customer’s name
Engine No.
Date of sale
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
Car phone
❏ ON / ❏ OFF
Radiator fan
❏ ON / ❏ OFF
Front wiper
❏ ON / ❏ OFF
Rear wiper
❏ ON / ❏ OFF
EN(H4SO 2.5)(diag)-4
ENGINE (DIAGNOSTICS)
Check List for Interview
2. CHECK LIST No. 2
Check the following items about the vehicle’s state when malfunction indicator light turns on.
NOTE:
Use copies of this page for interviewing customers.
a) Other warning lights or indicators turn on.
❏ Yes / ❏ No
❏ Low fuel warning light
❏ Charge warning light
❏ AT diagnostic indicator light
❏ ABS warning light
❏ Oil pressure warning light
b) Fuel level
• Lack of gasoline:
❏ Yes / ❏ No
• Indicator position of fuel gauge:
• Experience of 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 other parts except 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
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