Subaru Legacy IV (2008 year). Manual — part 636

GD(H6DO)-164

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DD:DTC P1153 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH)

(BANK1 SENSOR1)

1. OUTLINE OF DIAGNOSIS

Detect that

O value remains high.

Judge as NG when lambda value is abnormal in accordance with

O value of front oxygen (A/F) sensor and

running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback
control, etc.

2. COMPONENT DESCRIPTION

O value = Actual air fuel ratio/Theoretical air fuel ratio
O > 1: Lean
O < 1: Rich

(A)

Electromotive force

(C)

Lean

(D)

Rich

(B)

Air fuel ratio

(1)

Atmosphere

(3)

ZrO

2

(4)

Ceramic heater

(2)

Exhaust gas

(1)

(2)

(4)

(2)

(3)

EN-01693

(C)

(B)

(D)

(A)

GD(H6DO)-165

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 60000 ms have
passed since the engine started.

5. DIAGNOSTIC METHOD

• Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.

• Normality Judgement

Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.

Time Needed for Diagnosis: Less than 1 second

Secondary Parameters

Enable Conditions

Time needed for all secondary parameters to be in enable
conditions

t 4096 ms

Battery voltage

t 10.9 V

Barometric pressure

t 75 kPa (563 mmHg, 22.2 inHg)

Rear oxygen sensor sub feedback

Execution

Rear oxygen sensor output voltage – Feedback target voltage

–0.2 V — 0.1 V

or rear oxygen sensor sub feedback compensation coefficient

On Min.

or rear oxygen sensor sub feedback compensation coefficient

On Max.

Elapsed time after starting the engine

t 60000 ms

Engine coolant temperature

t 75 °C (167 °F)

Vehicle speed

t 20 km/h (12.4 MPH)

Amount of intake air

t 8 g/s (0.28 oz/s)

Load change at 120°CA

< 0.02 g/rev (0 oz/rev)

Front oxygen (A/F) sensor impedance

0

: — 50 :

Learning value of evaporation gas density

< 0.2

Total time of operating canister purge

t 19.9 s

Targeted lambda value load compensation coefficient

–0.05 — 0.050

Judgement Value

Malfunction criteria

Threshold value

O value

> 1.15

Judgement Value

Malfunction criteria

Threshold value

O value

d 1.15

GD(H6DO)-166

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DE:DTC P1154 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW)

(BANK 2 SENSOR 1)

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P1152. <Ref. to GD(H6DO)-162, DTC P1152 O2 SENSOR CIR-
CUIT RANGE/PERFORMANCE (LOW) (BANK1 SENSOR1), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>

DF:DTC P1155 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH)

(BANK 2 SENSOR 1)

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P1153. <Ref. to GD(H6DO)-164, DTC P1153 O2 SENSOR CIR-
CUIT RANGE/PERFORMANCE (HIGH) (BANK1 SENSOR1), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>

GD(H6DO)-167

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DG:DTC P1160 RETURN SPRING FAILURE

1. OUTLINE OF DIAGNOSIS

Judge as NG when the valve is opened more than the default opening angle, but does not move to the close
direction with the motor power stopped.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

• Ignition switch ON

o OFF

• Ignition switch OFF

o ON (Only after clearing memory)

(1)

Opener spring

(4)

Full closed stopper

(7)

DC motor

(2)

Return spring

(5)

Throttle valve

(8)

Main and sub throttle position sensor

(3)

Intermediate stopper

(6)

Gear

Secondary Parameters

Enable Conditions

Battery voltage

t 6 V

Throttle position sensor

Normal

EN-04463

S S

(8)

(6)

(7)

(5)

(1)

(3)

(2)

(4)