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Subaru Legacy IV (2008 year). Manual - part 111

EN(H4SO)(diag)-47

Drive Cycle

ENGINE (DIAGNOSTICS)

3. DRIVE CYCLE B — 10 MINUTES IDLING

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

4. DRIVE CYCLE C — DRIVE THE VEHICLE WITH FOLLOWING DRIVE PATTERNS

DTC

Item

Condition

*P0126

Insufficient Engine Coolant Temperature for Stable Operation

—

*P0171

System Too Lean (Bank 1)

Complete diagnosis with drive cycle A or C as well.

*P0172

System Too Rich (Bank 1)

Complete diagnosis with drive cycle A or C as well.

*P0301

Cylinder 1 Misfire Detected

Complete diagnosis with drive cycle A or C as well.

*P0302

Cylinder 2 Misfire Detected

Complete diagnosis with drive cycle A or C as well.

*P0303

Cylinder 3 Misfire Detected

Complete diagnosis with drive cycle A or C as well.

*P0304

Cylinder 4 Misfire Detected

Complete diagnosis with drive cycle A or C as well.

*P0464

Fuel Level Sensor Circuit Intermittent

—

*P0506

Idle Air Control System RPM Lower Than Expected

—

*P0507

Idle Air Control System RPM Higher Than Expected

—

*P2096

Post Catalyst Fuel Trim System Too Lean (Bank 1)

Complete diagnosis with drive cycle A or C as well.

*P2097

Post Catalyst Fuel Trim System Too Rich (Bank 1)

Complete diagnosis with drive cycle A or C as well.

P2103

Throttle Actuator Control Motor Circuit High

Complete diagnosis with drive cycle A or C as well.

(A)

Idle the engine for 10 seconds or
more.

(D)

Decelerate with fully closed throt-
tle to 64 km/h (40 MPH).

(G)

Stop vehicle with the throttle fully
closed.

(B)

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

EN-00842

(C)

(H)

(I)

(60)

64 (40)

(B)

(A)

(F)

(D)

(E)

150

100

(G)

EN(H4SO)(diag)-48

Drive Cycle

ENGINE (DIAGNOSTICS)

5. DRIVE CYCLE D

• Drift Diagnosis

1) Make sure that the engine coolant temperature at engine starting is less than 30°C (86°F).
2) Make sure that fuel remains 10

2 (2.6 US gal, 2.2 Imp gal) or more and the battery voltage is 10.9 V or

more.
3) Start the engine, and check that the engine coolant temperature increases by 10°C (50°F) or more, and
reaches 75°C (167°F) or more, when the engine is warmed up.
4) Idle the engine for 120 seconds or more in the condition of step 3.

• Stuck Diagnosis

1) Make sure that the battery voltage is 10.9 V or more.
2) Perform the Clear Memory Mode. <Ref. to EN(H4SO)(diag)-50, Clear Memory Mode.>
3) Drive for approximately 50

2 (13.2 US gal, 11 Imp gal) of fuel.

NOTE:
• It is acceptable to drive the vehicle intermittently.
• Do not disconnect the battery terminals while diagnosing. (Data will be cleared by disconnecting the bat-
tery terminals.)

DTC

Item

Condition

P0026

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

—

P0028

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

—

*P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1)

—

*P0068

MAP/MAF - Throttle Position Correlation

—

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)

—

*P0139

O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)

—

*P0171

System Too Lean (Bank 1)

Complete diagnosis with drive cycle A or B as well.

*P0172

System Too Rich (Bank 1)

Complete diagnosis with drive cycle A or B as well.

*P0301

Cylinder 1 Misfire Detected

Complete diagnosis with drive cycle A or B as well.

*P0302

Cylinder 2 Misfire Detected

Complete diagnosis with drive cycle A or B as well.

*P0303

Cylinder 3 Misfire Detected

Complete diagnosis with drive cycle A or B as well.

*P0304

Cylinder 4 Misfire Detected

Complete diagnosis with drive cycle A or B as well.

*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)

—

*P2096

Post Catalyst Fuel Trim System Too Lean (Bank 1)

Complete diagnosis with drive cycle A or B as well.

*P2097

Post Catalyst Fuel Trim System Too Rich (Bank 1)

Complete diagnosis with drive cycle A or B as well.

P2103

Throttle Actuator Control Motor Circuit High

Complete diagnosis with drive cycle A or B as well.

DTC

Item

Condition

*P0181

Fuel Temperature Sensor “A” Circuit Range/Performance

—

EN(H4SO)(diag)-49

Drive Cycle

ENGINE (DIAGNOSTICS)

6. DRIVE CYCLE E

1) Make sure that the battery voltage is 10.9 V or more.
2) Perform the Clear Memory Mode. <Ref. to EN(H4SO)(diag)-50, Clear Memory Mode.>
3) Drive for approximately 30

2 (7.9 US gal, 6.6 Imp gal) of fuel.

NOTE:
• It is acceptable to drive the vehicle intermittently.
• Do not disconnect the battery terminals while diagnosing. (Data will be cleared by disconnecting the bat-
tery terminals.)

7. DRIVE CYCLE F

1) Make sure that the engine coolant temperature at engine starting is less than 30°C (86°F).
2) Start the engine, and warm it up until engine coolant temperature increases over 95°C (203°F).
3) Idle the engine for more than 10 minutes in the condition of step 2.

NOTE:
Do not disconnect the battery terminals while diagnosing. (Data will be cleared by disconnecting the battery
terminals.)

8. DRIVE CYCLE H

1) Perform the Clear Memory Mode. <Ref. to EN(H4SO)(diag)-50, Clear Memory Mode.>
2) With the ignition switch ON, read the engine coolant temperature, intake air temperature and fuel temper-
ature. <Ref. to EN(H4SO)(diag)-34, READ CURRENT DATA FOR ENGINE (NORMAL MODE), OPERA-
TION, Subaru Select Monitor.>
3) If the values from step 2) satisfy the following two conditions, start the engine.

Condition:

|Engine coolant temperature — intake air temperature |

5°C (41°F)

|Engine coolant temperature — fuel temperature |

2°C (36°F)

NOTE:
• If the conditions are not satisfied, turn the ignition switch to OFF and wait until the parameters are satisfied.
• Start AT vehicles in the “P” range, and MT vehicles in the neutral position.
4) Idle the engine for 1 minute under the conditions in step 3).

DTC

Item

Condition

*P0461

Fuel Level Sensor “A” Circuit Range/Performance

—

DTC

Item

Condition

*P0111

Intake Air Temperature Sensor 1 Circuit Range/Performance

—

DTC

Item

Condition

P1602

Control Module Programming Error

—

EN(H4SO)(diag)-50

Clear Memory Mode

ENGINE (DIAGNOSTICS)

13.Clear Memory Mode

A: OPERATION

NOTE:
When Clear Memory Mode is performed in OBD
mode of Subaru Select Monitor, only DTCs are
cleared.

1. SUBARU SELECT MONITOR (NORMAL
MODE)

1) On the «Main Menu» display screen, select the
{Each System Check}.
2) On the «System Selection Menu» display
screen, select the {Engine Control System}.
3) Click the [OK] button after the information of en-
gine type has been displayed.
4) On the «Engine Diagnosis» display screen, se-
lect the {Clearing Memory}.
5) When the “Clear Memory?” is shown on the
screen, click the [Yes] button.
6) When “Done” and “Turn off the ignition switch.”
are shown on the display screen, turn the ignition
switch to OFF.

NOTE:
• Initial diagnosis of electronic throttle control is
performed after memory clearance. Wait for 10
seconds or more after turning the ignition switch to
ON, and then start the engine.
• For detailed operation procedures, refer to the
“PC application help for Subaru Select Monitor”.

2. SUBARU SELECT MONITOR (OBD MODE)

1) On the «Main Menu» display screen, select the
{Each System Check}.
2) On the «System Selection Menu» display
screen, select the {Engine Control System}.
3) Click the [OK] button after the information of en-
gine type has been displayed.
4) On the «Engine Diagnosis» display screen, se-
lect the {OBD System}.
5) On the «OBD Menu» display screen, select the
{Clear Diagnostic Code}.
6) When the “Clear Diagnostic Code?” is shown on
the screen, click the [Yes] button.
7) When “Done” and “Turn off the ignition switch.”
are shown on the display screen, turn the ignition
switch to OFF.

3. GENERAL SCAN TOOL

For clear memory procedures using the general
scan tool, refer to “General Scan Tool Instruction
Manual”.

NOTE:
Initial diagnosis of electronic throttle control is per-
formed after memory clearance. For this reason,
start the engine after 10 seconds or more have
elapsed since the ignition switch was turned to ON.

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