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Subaru Legacy IV (2008 year). Manual - part 100

EN(H4SO)(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

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(H4SO)(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 /

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 /

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

Yes /

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

Yes /

• What:

d) Intentional connecting or disconnecting of hoses:

Yes /

• What:

e) Installing of parts other than genuine parts:

Yes /

• What:
• Where:

f) Occurrence of noise:

Yes /

• From where:
• What kind:

g) Occurrence of smell:

Yes /

• From where:
• What kind:

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

Yes /

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

EN(H4SO)(diag)-5

General Description

ENGINE (DIAGNOSTICS)

3. General Description

A: CAUTION

1) Airbag system wiring harness is routed near the
ECM, main relay and fuel pump relay.

CAUTION:
• Do not use the electrical test equipment on
airbag system circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the ECM, TCM,
main relay and fuel pump relay.
2) Never connect the battery in reverse polarity.
Failure to do so will damage the ECM instantly, and
other parts will also be damaged.
3) Do not disconnect the battery terminals while the
engine is running. A large counter electromotive
force will be generated in the generator, and this
voltage may damage electronic parts such as ECM
etc.
4) Before disconnecting the connectors of each
sensor and ECM, be sure to turn the ignition switch
to OFF. Perform the Clear Memory Mode after con-
necting the connectors. <Ref. to EN(H4SO)(diag)-
50, Clear Memory Mode.>
5) When measuring the voltage or resistance of in-
dividual sensor or all electrical control modules,
use a tapered pin with a diameter of less than 0.6
mm (0.024 in). Do not insert the pin 4 mm (0.16 in)
or more into the part.

CAUTION:
When replacing the ECM, be careful not to use
the wrong spec. ECM to avoid any damage on
the fuel injection system.

NOTE:
When replacing the ECM of the models with Immo-
bilizer, immobilizer system must be registered. To
do so, all ignition keys and ID cards need to be pre-
pared. Refer to the “PC application help for Subaru
Select Monitor”.
6) Take care not to allow water to get into the con-
nector when servicing the vehicle in rainy weather
or when washing the vehicle. Avoid exposure to
water even if the connectors are waterproof.

7) Use ECM mounting stud bolts at the body side
grounding point when measuring voltage and resis-
tance inside the passenger compartment.

8) Use the engine ground terminal or engine as-
sembly for the grounding point to chassis when
measuring the voltage and resistance in engine
compartment.

9) Every engine control system-related part is a
precision part. Do not drop them.
10) Observe the following cautions when installing
a radio in vehicle.

CAUTION:
• The antenna must be kept as far apart as pos-
sible from control module. (ECM is installed un-
der the passenger's side floor mat.)
• The antenna feeder must be placed as far
apart as possible from the ECM and engine
control system harness.
• Carefully adjust the antenna for correct
matching.
• When mounting a large power type radio, pay
special attention to the three items mentioned
above.
• Incorrect installation of the radio may affect
the operation of ECM.
11) When disconnecting the fuel hose, release the
fuel pressure. <Ref. to FU(H4SO)-43, RELEASING
OF FUEL PRESSURE, PROCEDURE, Fuel.>

(A) Stud bolt

EN-00001

(A)

FU-01090

EN(H4SO)(diag)-6

General Description

ENGINE (DIAGNOSTICS)

12) For the model with ABS, the ABS warning light
may illuminate when performing driving test with
jacked-up or lifted-up condition, but this is not a
system malfunction. The reason for this is the
speed difference between the front and rear
wheels. After diagnosis of engine control system,
perform the ABS memory clear procedure of self-
diagnosis function.

B: INSPECTION

Before performing diagnostics, check the following
item which might affect engine problems.

1. BATTERY

1) Measure the battery voltage and specific gravity
of the electrolyte.

Standard voltage: 12 V

Specific gravity: 1.260 or more
2) Check the condition of the main and other fuses,
and harnesses and connectors. Also check for
proper grounding.

2. ENGINE GROUND

Check if the engine ground terminal is properly
connected to engine.

C: NOTE

• The on-board diagnostic (OBD) system detects
and indicates a fault in various inputs and outputs
of the complex electronic control. Malfunction indi-
cator light in the combination meter indicates oc-
currence of a fault or trouble.
• Further, against such a failure or sensors as may
disable the drive, the fail-safe function is provided
to ensure the minimal drivability.
• The OBD system incorporated with the vehicles
within this type of engine complies with OBD-II reg-
ulations. The OBD system monitors the compo-
nents and the system malfunction listed in “Engine
Section” which affects on emissions.
• When the system decides that a malfunction oc-
curs, malfunction indicator light illuminates. At the
same time of the malfunction indicator light illumi-
nation or blinking, a DTC and a freeze frame en-
gine conditions are stored into on-board computer.
• The OBD system stores freeze frame engine
condition data (engine load, engine coolant tem-
perature, fuel trim, engine speed and vehicle
speed, etc.) into on-board computer when it detects
a malfunction.
• Freeze frame engine condition data are stored
until the DTCs are cleared. However when such
malfunctions as fuel trim fault and misfire are de-
tected with the freeze frame engine condition data
stored, they are rewritten into those related to the
fuel trim fault and misfire.
• When the malfunction does not occur again for
three consecutive driving cycles, malfunction indi-
cator light is turned off, but DTC remains at on-
board computer.
• When troubleshooting the vehicle which com-
plies with OBD-II regulations, connect the Subaru
Select Monitor or general scan tool to the vehicle.

FU-01090

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