Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 195
EN(H4DOTC)(diag)-4
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 type
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
Rear entertainment system
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)-5
Check List for Interview
ENGINE (DIAGNOSTICS)
2. CHECK LIST NO. 2
Check the following item about the vehicle’s state when the malfunction indicator light turns on.
NOTE:
Use copies of this page for interviewing customers.
a) Other warning lights or indicators illuminate:
Yes /
No
Fuel level warning light
Charge warning light
Engine coolant temperature warning light
Oil pressure warning light
ATF temperature warning light or SPORT indicator light
Driver’s control center differential indicator light
ABS warning light
VDC warning light
Cruise indicator light
SI-CRUISE warning light
Immobilizer indicator light
STEERING warning light
Electronic parking brake warning light
Glow indicator light
Sedimenter warning light
Others:
b) Fuel level
• Lack of fuel:
Yes /
No
• Indicator position of fuel gauge:
• Experienced running out of fuel:
Yes /
No
c) Intentional connecting or disconnecting of 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
EN(H4DOTC)(diag)-6
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 electrical test equipment on the
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.
Doing 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) When disconnecting the connectors of the elec-
trical components, always be sure to turn the igni-
tion switch to OFF. Perform the Clear Memory
Mode after connecting the connectors. <Ref. to
EN(H4DOTC)(diag)-63, 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 ECM of wrong specification 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. For
detailed procedures, refer to “REGISTRATION
MANUAL FOR IMMOBILIZER”.
6) Take care not to allow water to get into the con-
nectors when servicing or washing the vehicle in
rainy weather. Avoid exposure to water even if the
connectors are waterproof.
7) Use ECM mounting stud bolts for the grounding
point when measuring voltage and resistance in-
side the passenger compartment.
8) Use the engine ground terminal or engine as-
sembly for the grounding point when measuring the
voltage and resistance in engine compartment.
9) All parts related to the engine control system are
precision parts. Do not drop or otherwise apply im-
pact. Do not reuse the parts that are dropped acci-
dentally.
10) Observe the following cautions when installing
a radio in vehicle.
CAUTION:
• The antenna must be kept as far apart as pos-
sible from the ECM. <Ref. to EN(H4DOTC)(di-
Electrical Component Location.>
• 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.
(A) Stud bolt
EN-00069
(A)
FU-01170
EN(H4DOTC)(diag)-7
General Description
ENGINE (DIAGNOSTICS)
11) When disconnecting the fuel hose, be sure to
release the fuel pressure beforehand. <Ref. to
FU(STI)-67, RELEASING OF FUEL PRESSURE,
PROCEDURE, Fuel.> <Ref. to FU(w/o STI)-65,
RELEASING OF FUEL PRESSURE, PROCE-
12) Warning lights 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 rotating speed difference between the front
and rear wheels. After diagnosis of engine control
system, perform the VDC memory clear procedure
of self-diagnosis function. <Ref. to VDC(diag)-27,
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
Make sure that the engine ground terminal is prop-
erly connected to the 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 of 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.
*: One driving cycle means the period between the
ignition switch ON and the ignition switch OFF after
driving.
• When performing diagnosis, connect the Subaru
Select Monitor or general scan tool to the vehicle.
FU-01170
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