Subaru Legacy III (2000-2003 year). Manual - part 312

 

  Index      Subaru     Subaru Legacy III - service repair manual 2000-2003 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  310  311  312  313   ..

 

 

Subaru Legacy III (2000-2003 year). Manual - part 312

 

 

EN(H6DO)-50

ENGINE (DIAGNOSTICS)

INSPECTION MODE

(1) Connect Subaru Select Monitor to data link
connector (A) located in the lower portion of the
instrument panel (on the driver's side).

(2) Connect diagnosis cable to data link con-
nector.

CAUTION:
Do not connect scan tools except for Subaru 
Select Monitor and OBD-II general scan tool.
7) Turn ignition switch to ON (engine OFF) and
Subaru Select Monitor switch to ON.

8) On the «Main Menu» display screen, select the
{2. Each System Check} and press the [YES] key.
9) On the «System Selection Menu» display
screen, select the {Engine Control System} and
press the [YES] key.
10) Press the [YES] key after displayed the infor-
mation of engine type.
11) On the «Engine Diagnosis» display screen, se-
lect the {Dealer Check Mode Procedure} and press
the [YES] key.
12) When the “Perform Inspection (Dealer Check)
Mode?” is shown on the display screen, press the
[YES] key.
13) Perform subsequent procedures as instructed
on the display screen.
• If trouble still remains in the memory, the corre-
sponding diagnostic trouble code (DTC) appears
on the display screen.

NOTE:
• For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.
• For detailed concerning diagnostic trouble
codes, refer to the List of Diagnostic Trouble Code
(DTC).
<Ref. to EN(H6DO)-89, List of Diagnostic Trouble
Code (DTC).>
• Release the parking brake.
• The speed difference between front and rear
wheels may light either the ABS warning light, but
this indicates no malfunctions. When engine con-
trol diagnosis is finished, perform the ABS memory
clearance procedure of self-diagnosis system.

3. OBD-II GENERAL SCAN TOOL

1) After performing diagnostics and clearing the
memory, check for any remaining unresolved trou-
ble data: <Ref. to EN(H6DO)-54, Clear Memory
Mode.>
2) Connect test mode connector at the lower side
of the instrument panel (on the driver's side).

3) Connect the OBD-II general scan tool to its data
link connector in the lower portion of the instrument
panel (on the driver's side).

(A) Data link connector

(A) Power switch

EN-00710

( A )

EN-00040

( A )

(A) Test mode connector

EN-00711

( A )

EN(H6DO)-51

ENGINE (DIAGNOSTICS)

INSPECTION MODE

CAUTION:
Do not connect the scan tools except for 
Subaru Select Monitor and OBD-II general scan 
tool.

4) Start the engine.

NOTE:
Ensure the select lever is placed in the “P” position
before starting.
5) Using the select lever, turn the “P” position
switch and the “N” position switch to ON.
6) Depress the brake pedal to turn the brake switch
ON.
7) Keep engine speed in the 2,500 — 3,000 rpm
range for 40 seconds.
8) Place the select lever in the “D” position and
drive the vehicle at 5 to 10 km/h (3 to 6 MPH).

NOTE:
• On AWD vehicles, release the parking brake.
• The speed difference between front and rear
wheels may light the ABS warning light, but this in-
dicates no malfunctions. When engine control diag-
nosis is finished, perform the ABS memory
clearance procedure of self-diagnosis system.
9) Using the OBD-II general scan tool, check for di-
agnostic trouble code(s) and record the result(s).

NOTE:
• For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
• For detailed concerning diagnostic trouble
codes, refer to the List of Diagnostic Trouble Code
(DTC). 
<Ref. to EN(H6DO)-89, List of Diagnostic Trouble
Code (DTC).>

(A) Data link connector

EN-00710

( A )

EN(H6DO)-52

ENGINE (DIAGNOSTICS)

DRIVE CYCLE

13.Drive Cycle

A: OPERATION

There are 3 drive patterns for trouble diagnosis. Driving in the specified pattern allows to diagnose the mal-
functioning items listed below. After the malfunctioning items listed below are repaired, always check wheth-
er they correctly resume their functions by driving in the required drive pattern. 

1. PREPARATION FOR THE DRIVE CYCLE.

1) Make sure that fuel remains approx. half amount [20 to 40 

2

 (5.3 — 10.6 US gal, 4.4 — 8.8 Imp gal)], and

battery voltage is 12V or more.
2) After performing diagnostics and cleaning the memory, check for any remaining unresolved trouble data.
<Ref. to EN(H6DO)-54, Clear Memory Mode.>
3) Separate test mode connector.

NOTE:
• Except for water temperature specified items at starting, diagnosis is carried out after engine warm up.
• Carry out diagnosis which is marked * on DTC twice, Then, after finishing 1st diagnosis, stop engine and
do the second time at the same condition.

2. AFTER RUNNING 20 MINUTES AT 80 KM/H (50 MPH), IDLE ENGINE FOR 1 MINUTE. 

3. IDLE FOR 10 MINUTES 

NOTE:
Before diagnosis, drive vehicle at 4 km/h (6 MPH) or more.

DTC No.

Item

Condition 

*P0111

Intake air temperature circuit range/performance

Coolant temperature at start is 
less than 30

°

C (86

°

F). 

*P0125

Insufficient coolant temperature for closed loop fuel control

Coolant temperature at start is 
less than 20

°

C (68

°

F). 

*P0133

O2 sensor circuit slow response (Bank 1 Sensor 1)

*P0153

O2 sensor circuit slow response (Bank 2 Sensor 1)

*P0420

Catalyst System Efficiency Below Threshold (Bank 1)

P0459

Evaporative emission control system purge control valve circuit high

P0461

Fuel level sensor circuit range/performance

DTC No.

Item

Condition

*P0483

Cooling fan rationality check

*P0506

Idle control system RPM lower than expected

*P0507

Idle control system RPM higher than expected

EN(H6DO)-53

ENGINE (DIAGNOSTICS)

DRIVE CYCLE

4. DRIVE ACCORDING TO THE FOLLOWING DRIVE PATTERN

(A) Idle engine for 1 minute.

(D) Decelerate with fully closed throt-

tle to 64 km/h (40 MPH).

(F) Accelerate to 97 km/h (60 MPH) 

within 10 seconds.

(B) Accelerate to 97 km/h (60 MPH) 

within 20 seconds.

(E) Drive vehicle at 64 km/h (40 MPH) 

for 10 seconds.

(G) Stop vehicle with throttle fully 

closed.

(C) Drive vehicle at 97 km/h (60 MPH) 

for 20 seconds.

DTC No.

Item

Condition

*P0121

Throttle/pedal position sensor/switch “A” circuit range/performance

Coolant temperature at start is 
more than 80

°

C (176

°

F).

*P0139

O2 sensor circuit slow response (Bank 1 Sensor 2)

*P0171

System too lean (Bank 1)

*P0172

System too rich (Bank 1)

*P0174

System too lean (Bank 2)

*P0175

System too rich (Bank 2)

*P0301

Cylinder 1 misfire detected

*P0302

Cylinder 2 misfire detected

*P0303

Cylinder 3 misfire detected

*P0304

Cylinder 4 misfire detected

*P0305

Cylinder 5 misfire detected

*P0306

Cylinder 6 misfire detected

*P0400

Exhaust gas recirculation flow

EN-00195

50

100

150

0

65 (40)

96 (60)

(Seconds)

Vehicle speed km/h (MPH)

( A )

( B )

( C )

( D )

( E )

( F )

( G )

 

 

 

 

 

 

 

Content   ..  310  311  312  313   ..