Subaru Legacy (2005 year). Manual - part 188

EN(H4SO 2.5)(diag)-37

ENGINE (DIAGNOSTICS)

Inspection Mode

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).

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(H4SO 2.5)(diag)-69, List of Diagnostic
Trouble Code (DTC).>

EN(H4SO 2.5)(diag)-38

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.

NOTE:
KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

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(H4SO 2.5)(diag)-40, 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

*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)

—

*P0420

Catalyst System Efficiency Below Threshold (Bank 1)

—

P0459

Evaporative Emission System Purge Valve Circuit High

—

DTC

Item

Condition

P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1)

—

EN(H4SO 2.5)(diag)-39

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

Condition

*P0139

O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)

—

*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

P0700

Transmission Control System (MIL Request)

—

P2504

Charging System Voltage High

—

EN-00842

(C)

(H)

(I)

(60)

97

64 (40)

(B)

(A)

(F)

(D)

(E)

150

100

50

0

(G)

EN(H4SO 2.5)(diag)-40

ENGINE (DIAGNOSTICS)

Clear Memory Mode

13.Clear Memory Mode

A: OPERATION

1. SUBARU SELECT MONITOR (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 en-
gine type has been displayed.
4) On the «Engine Diagnosis» display screen, se-
lect the {Clear Memory} and press the [YES] key.
5) When the “Done” and “Turn Ignition Switch OFF”
are shown on the display screen, turn the ignition
switch to OFF and then Subaru Select Monitor
power switch to OFF.

NOTE:
• Initial diagnosis of electronic throttle control is
performed after memory clearance. For this rea-
son, start the engine after 10 seconds or more have
elapsed since the ignition switch was turned to ON.
• For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.

2. SUBARU SELECT MONITOR (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 en-
gine type has been displayed.
4) On the «Engine Diagnosis» display screen, se-
lect the {OBD System} and press the [YES] key.
5) On the «OBD Menu» display screen, select the
{DTC Clear} and press the [YES] key.
6) When the “Perform Diagnostic Code(s) Clear?”
is shown on the screen, press the [YES] key.
7) Turn the ignition switch to OFF, and the Subaru
Select Monitor power switch to OFF.
• Initial diagnosis of electronic throttle control is
performed after memory clearance. For this rea-
son, start the engine after 10 seconds or more have
elapsed since the ignition switch was turned to ON.
• For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.

3. GENERAL SCAN TOOL

For clear memory procedures using the general
scan tool, refer to the general scan tool operation
manual.