Subaru Legacy (2005 year). Manual — part 316

EN(H4DOTC)(diag)-33

ENGINE (DIAGNOSTICS)

Inspection Mode

8) Turn the ignition switch to ON (engine OFF), and
the Subaru Select Monitor power switch to ON.

9) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
10) On the «System Selection Menu» display
screen, select the {Engine} and press the [YES]
key.
11) Press the [YES] key after the information of en-
gine type has been displayed.
12) On the «Engine Diagnosis» screen, select the
{D Check} and press the [YES] key.
13) When the “Perform D Check?” is shown on the
screen, press the [YES] key.
14) Perform subsequent procedures as instructed
on the display screen.
• If trouble still remains in the memory, the corre-
sponding DTC appears on the display screen.

NOTE:
• For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.
• For details concerning DTC, refer to “List of Diag-
nostic Trouble Code (DTC)”.
<Ref. to EN(H4DOTC)(diag)-62, List of Diagnostic
Trouble Code (DTC).>
• 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 function.

3. GENERAL SCAN TOOL

1) After performing the diagnostics and clearing the
memory, check for any remaining unresolved trou-
ble data. <Ref. to EN(H4DOTC)(diag)-37, Clear
Memory Mode.>
2) Idle the engine.

3) Connect the test mode connector (A) located at
the lower portion of glove box.

4) Connect the general scan tool to data link con-
nector located in the lower portion of the instrument
panel (on the driver’s side).

CAUTION:
Do not connect any scan tools except Subaru
Select Monitor or general scan tool.

5) Start the engine.

NOTE:
• Ensure the select lever is placed in “P” position
before starting. (AT model)
• Depress the clutch pedal when starting the en-
gine. (MT model)
6) Using the select lever or shift lever, turn the “P”
position switch and “N” position switch to ON.
7) Depress the brake pedal to turn brake switch
ON. (AT model)
8) Keep the engine speed in 2,500 — 3,000 rpm
range for 40 seconds.
9) Shift the select lever or shift lever in the “D”
range (AT model) or “1st” gear (MT model) and
drive the vehicle at 5 to 10 km/h (3 to 6 MPH).

NOTE:
• For AWD model, 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.
10) Using the general scan tool, check DTC and
record the result(s).

(A) Power switch

(A)

EN-00040

(A)

EN-02424

EN-02097

EN(H4DOTC)(diag)-34

ENGINE (DIAGNOSTICS)

Inspection Mode

NOTE:
• For detailed operation procedure, refer to the
general scan tool operation manual.
• For details concerning DTC, refer to “List of Diag-
nostic Trouble Code (DTC)”.
<Ref. to EN(H4DOTC)(diag)-62, List of Diagnostic
Trouble Code (DTC).>

EN(H4DOTC)(diag)-35

ENGINE (DIAGNOSTICS)

Drive Cycle

12.Drive Cycle

A: PROCEDURE

There are three drive patterns for the trouble diagnosis. Driving in the specified pattern allows to diagnose
malfunctioning items listed below. After the repair of the following trouble items, be sure to drive the vehicle
with the specified drive patterns to check whether the function is resumed correctly.

1. PREPARATION FOR DRIVE CYCLE

1) Check that the battery voltage is more than 12 V and fuel remains half [20 — 40

2 (5.3 — 10.6 US gal,

4.4 — 8.8 Imp gal)].
2) After performing the diagnostics and clearing the memory, check for any remaining unresolved trouble da-
ta. <Ref. to EN(H4DOTC)(diag)-37, Clear Memory Mode.>
3) Separate the test mode connector.

NOTE:
• Perform the diagnosis after warming up the engine except when the engine coolant temperature at starting
is specified.
• Perform the diagnosis twice if the DTC marked with *. After completing the first diagnosis, stop the engine
and perform second diagnosis in same condition.

2. DRIVE THE VEHICLE WITH 80 KM/H (50 MPH) FOR 20 MINUTES, AND THEN IDLE THE EN-
GINE FOR A MINUTE.

3. 10 MINUTES IDLING

NOTE:
Drive the vehicle in more than 10 km/h (6 MPH) before diagnosis.

DTC

Item

Condition

*P0171

System Too Lean (Bank 1)

—

*P0172

System Too Rich (Bank 1)

—

P0459

Evaporative Emission System Purge Control Valve Circuit High

—

DTC

Item

Condition

*P0171

System Too Lean (Bank 1)

—

*P0172

System Too Rich (Bank 1)

—

EN(H4DOTC)(diag)-36

ENGINE (DIAGNOSTICS)

Drive Cycle

4. DRIVE ACCORDING TO THE FOLLOWING DRIVE PATTERN

(A)

Idle the engine for more than 10
seconds.

(D)

Decelerate the vehicle to 64 km/h
(40 MPH) with throttle fully closed.

(G)

Stop the vehicle with throttle fully
closed.

(B)

Accelerate the vehicle to 97 km/h
(60 MPH) within 20 seconds.

(E)

Drive the vehicle at 64 km/h (40
MPH) for 20 seconds.

(H)

Vehicle speed km/h (MPH)

(I)

Sec.

(C)

Drive the vehicle at 97 km/h (60
MPH) for 20 seconds.

(F)

Accelerate the vehicle to 97 km/h
(60 MPH) within 10 seconds.

DTC

Item

On condition

P0134

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

—

*P0171

System Too Lean (Bank 1)

—

*P0172

System Too Rich (Bank 1)

—

P0246

Turbo/Super Charger Wastegate Solenoid A High

—

P0562

System Voltage Low

—

P0563

System Voltage High

—

EN-00842

(C)

(H)

(I)

(60)

97

64 (40)

(B)

(A)

(F)

(D)

(E)

150

100

50

0

(G)