Subaru Legacy (2005 year). Manual - part 431

 

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Subaru Legacy (2005 year). Manual - part 431

 

 

EN(H6DO)(diag)-37

ENGINE (DIAGNOSTICS)

Inspection Mode

7) Connect the Subaru Select Monitor to data link
connector located in the lower portion of the instru-
ment panel (on the driver’s side).

CAUTION:
Do not connect any scan tools except Subaru 
Select Monitor or general scan tool.
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(H6DO)(diag)-66, 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(H6DO)(diag)-41, Clear Mem-
ory 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 the “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.

(A) Power switch

EN-02533

(A)

EN-00040

PI-00201

(A)

EN-02533

EN(H6DO)(diag)-38

ENGINE (DIAGNOSTICS)

Inspection Mode

9) Place the select lever or shift lever in “D” position
(AT model) or “1st” gear (MT model) 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.
10) Using the general scan tool, check DTC and
record the result(s).

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(H6DO)(diag)-66, List of Diagnostic
Trouble Code (DTC).>

EN(H6DO)(diag)-39

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(H6DO)(diag)-41, Clear Memory Mode.>
3) Separate the test mode connector.

NOTE:
• Perform the diagnosis after warming up the engine except the engine coolant temperature is specified at
starting.
• 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

On condition

*P0125

Insufficient Coolant Temperature for Closed Loop Fuel Control

Engine coolant temperature at 
engine start is 20

°C (68°F) or 

less.

*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)

DTC

Item

On condition

*P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1)

*P0050

HO2S Heater Control Circuit (Bank 2 Sensor 1)

*P0459

Evaporative Emission System Purge Control Valve Circuit High

EN(H6DO)(diag)-40

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

P0026

Intake Valve Control Solenoid Circuit Range/performance (Bank 1)

P0028

Intake Valve Control Solenoid Circuit Range/performance (Bank 2)

P0076

Intake Valve Control Solenoid Circuit Low (Bank 1)

P0082

Intake Valve Control Solenoid Circuit Low (Bank 2)

*P0101

Mass or Volume Air Flow Circuit Range/Performance

P0134

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

P0154

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)

*P0301

Cylinder 1 Misfire Detected

Diagnosis may complete at once

*P0302

Cylinder 2 Misfire Detected

Diagnosis may complete at once

*P0303

Cylinder 3 Misfire Detected

Diagnosis may complete at once

*P0304

Cylinder 4 Misfire Detected

Diagnosis may complete at once

*P0305

Cylinder 5 Misfire Detected

Diagnosis may complete at once

*P0306

Cylinder 6 Misfire Detected

Diagnosis may complete at once

P0400

Exhaust Gas Recirculation Flow

P1492

EGR Solenoid Valve Signal #1 Circuit Malfunction (Low Input)

P1493

EGR Solenoid Valve Signal #1 Circuit Malfunction (High Input)

P1494

EGR Solenoid Valve Signal #2 Circuit Malfunction (Low Input)

P1495

EGR Solenoid Valve Signal #2 Circuit Malfunction (High Input)

P1496

EGR Solenoid Valve Signal #3 Circuit Malfunction (Low Input)

P1497

EGR Solenoid Valve Signal #3 Circuit Malfunction (High Input)

P1498

EGR Solenoid Valve Signal #4 Circuit Malfunction (Low Input)

P1499

EGR Solenoid Valve Signal #4 Circuit Malfunction (High Input)

P2504

Charging System Voltage High

EN-00842

(C)

(H)

(I)

(60)

97

64 (40)

(B)

(A)

(F)

(D)

(E)

150

100

50

0

(G)

 

 

 

 

 

 

 

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