EN(H6DO)(diag)-2
Basic Diagnostic Procedure
ENGINE (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
1. ENGINE
Step Check Yes No
1CHECK ENGINE START FAILURE.
1) Ask the customer when and how the trou-
ble occurred using the interview check list.
2) Start the engine.
Does the engine start? Go to step 2.Inspection using
“Diagnostics for
Engine Start Fail-
ure”.
57, Diagnostics for
Engine Starting
Fai lu r e.>
2CHECK ILLUMINATION OF MALFUNCTION
INDICATOR LIGHT.
Does the malfunction indicator
light illuminate?
Go to step 3.Inspection using
“General Diagnos-
tic Table”
392, INSPEC-
TION, General
Diagnostic Table.>
3CHECK INDICATION OF DTC ON DISPLAY.
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, and the Sub-
aru Select Monitor power switch to ON.
4) Read DTC on Subaru Select Monitor or
general scan tool.
Is DTC displayed on the Sub-
aru Select Monitor or general
scan tool?
Record the DTC.
Repair the trouble
cause.
69, List of Diag-
nostic Trouble
Code (DTC).> Go
to step 4.
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.
48, Malfunction In-
dicator Light.>
4PERFORM DIAGNOSIS
1) Perform the clear memory mode.
2) Perform the 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)”.
77, Diagnostic
Procedure with
Diagnostic Trou-
ble Code (DTC).>
Finish the diagno-
sis.
EN(H6DO)(diag)-6
General Description
ENGINE (DIAGNOSTICS)
C: NOTE
1. GENERAL DESCRIPTION
•The on-board diagnostics (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 engine family 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 first.
•If the OBD system detects the various malfunc-
tions including the fault of fuel trim or misfire, the
OBD system first stores freeze frame engine condi-
tions about fuel trim or 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.
2. ENGINE AND EMISSION CONTROL SYS-
TEM
•The Multipoint Fuel Injection (MFI) system is a
system that supplies the optimum air-fuel mixture
to the engine for all the various operating condi-
tions through the use of the latest electronic tech-
nology.
With this system fuel, which is pressurized at a con-
stant pressure, is injected into the intake air pas-
sage of the cylinder head. The injection quantity of
fuel is controlled by an intermittent injection system
where the electro-magnetic injection valve (fuel in-
jector) opens only for a short period of time, de-
pending on the quantity of air required for one cycle
of operation. In actual operation, the injection quan-
tity is determined by the duration of an electric
pulse applied to the fuel injector and this permits
simple, yet highly precise metering of the fuel.
•Further, all the operating conditions of the engine
are converted into electric signals, and this results
in additional features of the system, such as large
improved adaptability, easier addition of compen-
sating element etc.
The MFI system also has the following features:
•Reduced emission of harmful exhaust gases.
•Reduced in fuel consumption.
•Increased engine output.
•Superior acceleration and deceleration.
•Superior startability and warm-up perfor-
mance in cold weather since compensation is
made for coolant and intake air temperature.
EN(H6DO)(diag)-7
General Description
ENGINE (DIAGNOSTICS)
D: PREPARATION TOOL
ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS
18482AA010 CARTRIDGE Troubleshooting for electrical system.
22771AA030 SUBARU SELECT
MONITOR KIT
Tr o u b l e s h o o t i n g f o r e l e c t r i c a l s y s t e m .
ST18482AA010
ST22771AA030
EN(H6DO)(diag)-21
Data Link Connector
ENGINE (DIAGNOSTICS)
7. Data Link Connector
A: NOTE
This connector is used for Subaru Select Monitor.
CAUTION:
Do not connect any scan tools except Subaru Select Monitor or general scan tool because the circuit
for Subaru Select Monitor may be damaged.
EN-00037
12345 768
910111213 1514 16
Te r m i n a l N o . D e s c r i p t i o n Te r m i n a l N o . D e s c r i p t i o n
1Power supply 9Empty
2Empty 10Subaru Select Monitor signal
3Empty 11Empty
4Empty 12Ground
5Empty 13Ground
6Empty 14Empty
7Empty 15Empty
8Empty 16Empty
EN(H6DO)(diag)-26
Subaru Select Monitor
ENGINE (DIAGNOSTICS)
9. Subaru Select Monitor
A: OPERATION
1. HOW TO USE SUBARU SELECT MONI-
TOR
1) Prepare the Subaru Select Monitor kit.
eral Description.>
2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge to Subaru Select Monitor.
4) Connect the Subaru Select Monitor to the data
link connector at the lower portion of instrument
panel (on the driver’s side).
CAUTION:
Do not connect any scan tools except Subaru
Select Monitor or general scan tool.
5) Turn the ignition switch to ON (engine OFF) and
Subaru Select Monitor switch to ON.
6) Using the Subaru Select Monitor, call up DTCs
and data, then record them.
2. READ DIAGNOSTIC TROUBLE CODE
(DTC) FOR ENGINE (NORMAL MODE)
Refer to “Read Diagnostic Trouble Code” for infor-
mation about how to indicate DTC.
Code (DTC).>
3. READ DIAGNOSTIC TROUBLE CODE
(DTC) FOR ENGINE (OBD MODE)
Refer to “Read Diagnostic Trouble Code” for infor-
mation about how to indicate DTC.
Code (DTC).>
EN-00038
EN-00039
EN-03693
(A) Power switch
(A)
EN-00040
EN(H6DO)(diag)-27
Subaru Select Monitor
ENGINE (DIAGNOSTICS)
4. READ CURRENT DATA FOR ENGINE (NORMAL MODE)
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type has been displayed.
4) On the «Engine Diagnosis» display screen, select the {Current Data Display/Save}, and then press the
[YES] key.
5) On the «Data Display Menu» screen, select the {Data Display} and press the [YES] key.
6) Using the scroll key, scroll the display screen up or down until the desired data is shown.
•A list of the support data is shown in the following table.
Description Display Unit of measure Note (at idling)
Engine load Engine load % 3.5%
Engine coolant temperature signal Coolant Temp. °C or °F≥ 75°C or 167°F (After
engine is warmed-up.)
A/F compensation 1 A/F Compensation 1 % 3.1%
A/F learning 1 A/F learning 1 % 0.0%
A/F compensation 2 A/F Compensation 2 % 4.7%
A/F learning 2 A/F learning 2 % 0.0%
Intake manifold absolute pressure Mani. Absolute PressuremmHg, kPa,
inHg or psig
200 — 300 mmHg, 26.7 —
40 kPa, 7.8 — 11.8 inHg or
3.8 — 5.8 psig
Engine speed signal Engine speed rpm 600 — 800 rpm
Meter vehicle speed signal Meter vehicle speed km/h or MPH 0 km/h or 0 MPH
Ignition timing signal Ignition timing deg 13 — 15 deg
Intake air temperature signal Intake air temperature °C or °F (Ambient air temperature)
Amount of intake air Mass Air Flow g/s or lb/m 3.8 g/s or 0.5 lb/m
Throttle opening angle signal Throttle valve angle % 1.2 — 1.6%
Fr o nt ox yg e n se n so r vo lt a g e val ue 1Fr o n t oxy ge n s en s or vol t ag e
value 1V0.035 V
Fr o nt ox yg e n se n so r vo lt a g e val ue 2Fr o n t oxy ge n s en s or vol t ag e
value 2V0.020 V
Battery voltage Battery Voltage V 12 — 14 V
Mass air flow voltage Mass air flow voltage V 1.1 — 1.2 V
Injection 1 pulse width Injection 1 pulse width ms 2.82 ms
Injection 2 pulse width Injection 2 pulse width ms 2.82 ms
Knock sensor compensation Knock correction deg 0 deg
Atmospheric pressure signal Atmospheric pressuremmHg, kPa,
inHg or psig(Atmospheric pressure)
Intake manifold relative pressureIntake manifold relative pres-
sure
mmHg, kPa,
inHg or psig
(Intake manifold absolute
pressure — atmospheric
pressure)
Acceleration opening angle signal Acceleration opening angle % 0%
Radiator fan output Radiator fan output % 0%
Purge control solenoid valve duty ratio CPC Duty % 0 — 3%
Generator duty ALT duty % 0%
Fuel pump duty Fuel pump duty % 33%
Va r i a b l e va l v e t i m i n g a d v a n c e a n g l e a m o u n t R V V T a d va n c e a n g l e a m o u n t R d e g 0 d e g
Va r i a b l e va l v e t i m i n g a d v a n c e a n g l e a m o u n t L V V T a d va n c e a n g l e a m o u n t L d e g 0 d e g
Oil flow control solenoid valve duty R OCV duty R % 9.4%
Oil flow control solenoid valve duty L OCV duty L % 9.4%
Oil flow control solenoid valve current R OCV current R mA 64 mA
Oil flow control solenoid valve current L OCV current L mA 64 mA
Fr o nt ox yg e n ( A / F) s en so r cu r r en t va l ue 1 A / F s en s or cu r r e nt va l ue 1 mA 0 . 0 m A
Fr o nt ox yg e n ( A / F) s en so r cu r r en t va l ue 2 A / F s en s or cu r r e nt va l ue 2 mA 0 . 0 m A
Fr o nt ox yg e n ( A / F) s en so r r es is t an ce val ue 1 A / F s en s or r e si st a nc e val u e 1Ω31 Ω
EN(H6DO)(diag)-28
Subaru Select Monitor
ENGINE (DIAGNOSTICS)
Fr o nt ox yg e n ( A / F) s en so r r es is t an ce val ue 2 A / F s en s or r e si st a nc e val u e 2Ω31 Ω
Fr o nt ox yg e n ( A / F) s en so r ou t p ut la m bd a 1 A / F s en s or o ut p ut l am bd a 1 — 1 . 00
Fr o nt ox yg e n ( A / F) s en so r ou t p ut la m bd a 2 A / F s en s or o ut p ut l am bd a 2 — 1 . 00
Fuel tank pressure signal Fuel Tank PressuremmHg, kPa,
inHg or psig
+8.8 mmHg, +1.2 kPa,
+0.4 inHg or +0.17 psig
Fuel temperature signal Fuel Temp. °C or °F +28°C or +82°F
A/F compensation 3 A/F Compensation 3 % –0.16%
A/F learning 3 A/F learning 3 % 0.0%
Throttle motor duty Throttle motor duty % –27%
Throttle power supply voltage Throttle power supply voltage V (Battery voltage)
Sub throttle sensor voltage Sub throttle sensor voltage V 1.50 V
Main throttle sensor voltage Main throttle sensor voltage V 0.64 V
Sub acceleration sensor voltage Sub acceleration sensor voltage V 0.7 V
Main acceleration sensor voltage Main acceleration sensor voltage V 0.7 V
Memory vehicle speed Memory vehicle speed km/h or MPH 0 km/h or 0 MPH
A/F compensation 4 A/F Compensation 4 % 0.31%
A/F learning 4 A/F learning 4 % 0.0%
Fuel level sensor resistance Fuel level resistanceΩ4 — 96 Ω
Oil temperature Oil Temperature °C≥ 85°C (After engine is
warmed-up.)
Oil switching solenoid valve duty R OSV duty R % 17.3%
Oil switching solenoid valve duty L OSV duty L % 17.3%
Oil switching solenoid valve current R OSV current R mA 192 mA
Oil switching solenoid valve current L OSV current L mA 192 mA
Va r i a b l e va l v e l i f t m o d e V V L L i f t M o d e — 1
#1 cylinder roughness monitor #1 cylinder roughness monitor — 0
#2 cylinder roughness monitor #2 cylinder roughness monitor — 0
#3 cylinder roughness monitor #3 cylinder roughness monitor — 0
#4 cylinder roughness monitor #4 cylinder roughness monitor — 0
#5 cylinder roughness monitor #5 cylinder roughness monitor — 0
#6 cylinder roughness monitor #6 cylinder roughness monitor — 0
Te s t m o d e t e r m i n a l Te s t m o d e t e r m i n a l — U c h e c k
Neutral position switch signal Neutral SW — Neutral
Idle switch signal Soft idle SW — In idle
Ignition switch signal Ignition SW — ON input
Pow er s te e r in g sw it c h s ig n al Powe r st ee r i ng S W i n pu t si gn a l — O FF i np u t ( w h e n OF F )
Air conditioning switch signal A/C SW — OFF input (when OFF)
Starter switch signal Starter SW — OFF input
Fr o nt ox yg e n mo n it o r 1 Fr o n t oxy ge n m on i to r 1 — Ri ch
Fr o nt ox yg e n mo n it o r 2 Fr o n t oxy ge n m on i to r 2 — Ri ch
Knocking signal Knock signal — OFF
Crankshaft position sensor signal Crankshaft angle signal — Yes
Camshaft position sensor signal Camshaft angle signal — Yes
Drain valve signal Vent. Solenoid Valve — OFF output (when OFF)
Rear defogger switch signal Rear defogger SW — OFF input (when OFF)
Blower fan switch signal Blower fan SW — OFF input (when OFF)
Light switch signal Light SW — OFF input (when OFF)
Wiper switch signal Wiper SW — OFF input (when OFF)
A/C middle pressure switch signal A/C middle pressure SW — OFF input
A/C compressor relay signal A/C compressor relay output — OFF output
AT c o o r d i n a t e r e t a r d a n g l e d e m a n d s i g n a lAT c o o r d i n a t e r e t a r d a n g l e
demand—Yes
Description Display Unit of measure Note (at idling)
EN(H6DO)(diag)-29
Subaru Select Monitor
ENGINE (DIAGNOSTICS)
5. READ CURRENT DATA FOR ENGINE (OBD MODE)
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type has been displayed.
4) On the «Engine Diagnosis» display screen, select the {OBD System} and press the [YES] key.
5) On the «OBD Menu» display screen, select the {Current Data Display/Save}, and then press the [YES]
key.
6) On the «Data Display Menu» screen, select the {Data Display} and press the [YES] key.
7) Using the scroll key, scroll the display screen up or down until the desired data is shown.
•A list of the support data is shown in the following table.
AT c o o r d i n a t e f u e l c u t d e m a n d s i g n a l AT c o o r d i n a t e f u e l c u t d e m a n d — O F F
Ve h i c l e d y n a m i c s c o n t r o l ( V D C ) t o r q u e d o w n
prohibition outputBan of Torque Down — Permission
Ve h i c l e d y n a m i c s c o n t r o l ( V D C ) t o r q u e d o w n
demandVDC torque down demand — OFF
AT c o o r d i n a t e p e r m i s s i o n s i g n a l AT c o o r d i n a t e p e r m i s s i o n s i g n a l — P e r m i s s i o n
Electronic throttle control motor relay signal ETC motor relay — ON
Stop light switch signal Stop Light Switch — OFF
SET/COAST switch signal SET/COAST SW — OFF
RESUME/ACCEL switch signal RESUME/ACCEL SW — OFF
Brake switch signal Brake SW — OFF
Main switch signal Main SW — OFF
Body integrated unit data reception Body Int. Unit Data — Yes
Body integlated unit counter update Body Int. Unit Count — Yes
Cruise control cancel switch signal CC Cancel SW — OFF
Va r i a b l e v a l v e l i f t d i a g n o s i s o i l p r e s s u r e sw i t c h
signal 1Oil Temperature SW1 — ON
Va r i a b l e v a l v e l i f t d i a g n o s i s o i l p r e s s u r e sw i t c h
signal 2Oil Temperature SW2 — ON
Description Display Unit of measure
Number of diagnosis code Number of Diag. Codes: 0
Condition of malfunction indicator light MI (MIL) ON or OFF
Monitoring test of misfire Misfire monitoring Finish
Monitoring test of fuel system Fuel system monitoring Finish
Monitoring test of comprehensive component Component monitoring Finish
Te s t o f c a t a l y s t C a t a l y s t D i a g n o s i s F i n i s h o r i n c o m p l e t e
Te s t o f h e a t i n g - t y p e c a t a l y s t H e a t e d c a t a l y s t N o
Te s t o f e v a p o r a t i v e e m i s s i o n p u r g e c o n t r o l s y s t e m E v a p o r a t i v e p u r g e s y s t e m F i n i s h o r i n c o m p l e t e
Te s t o f s e c o n d a r y a i r s y s t e m S e c o n d a r y a i r s y s t e m N o
Te s t o f a i r c o n d i t i o n i n g s y s t e m r e f r i g e r a n t A / C s y s t e m r e f r i g e r a n t N o
Te s t o f o x y g e n s e n s o r O x y g e n s e n o r F i n i s h o r i n c o m p l e t e
Te s t o f o x y g e n s e n s o r h e a t e r O x y g e n s e n s o r h e a t e r F i n i s h
Te s t o f E G R s y s t e m E G R s y s t e m N o s u p p o r t
A/F control #1 Fuel system for Bank 1 OPEN early period
A/F control #2 Fuel system for Bank 2 OPEN early period
Calculated load valve Calculated load valve %
Engine coolant temperature Coolant Temp. °C
A/F compensation #1 Short term fuel trim B1 %
A/F learning #1 Long term fuel trim B1 %
A/F compensation #2 Short term fuel trim #2 %
A/F learning #2 Long term fuel trim B2 %
Description Display Unit of measure Note (at idling)