Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 317

GD(H4DOTC)-20

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

Judge as NG when the absolute value of the difference between cam signal input position and learning value

is out of specification.
• Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 20000 ms

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

cles.
NOTE:

Initial standard learning value is the value of crank angle initially input at the production plant. And then it will

be updated every time normal judgment has been completed. Learning value will not be updated if NG judg-

ment occurs because timing belt or chain derails suddenly in process or because wrong assembly occurs

during servicing.
• Normality Judgment
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

Judgment Value

Malfunction Criteria

Threshold Value

|Crankshaft position when camshaft position sensor signal is
input – Learning value|

> 8.5 °CA

Judgment Value

Malfunction Criteria

Threshold Value

|Crankshaft position when camshaft position sensor signal is
input – Learning value|

≤ 8.5 °CA

GD(H4DOTC)-21

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

M: DTC P0018 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELA-

TION (BANK2)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0016. <Ref. to GD(H4DOTC)-17, DTC P0016 CRANKSHAFT PO-

SITION - CAMSHAFT POSITION CORRELATION (BANK1), Diagnostic Trouble Code (DTC) Detecting Cri-

teria.>

N: DTC P0019 CRANK AND CAM TIMING B SYSTEM FAILURE (BANK 2)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0017. <Ref. to GD(H4DOTC)-19, DTC P0017 CRANK AND CAM

TIMING B SYSTEM FAILURE (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>

O: DTC P0021 INTAKE CAMSHAFT POSITION - TIMING OVER-ADVANCED OR

SYSTEM PERFORMANCE (BANK 2)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0011. <Ref. to GD(H4DOTC)-13, DTC P0011 INTAKE CAM-

SHAFT POSITION - TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1), Diagnostic

Trouble Code (DTC) Detecting Criteria.>

P: DTC P0024 EXHAUST AVCS SYSTEM 2 (RANGE/PERFORMANCE)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0014. <Ref. to GD(H4DOTC)-15, DTC P0014 EXHAUST AVCS

SYSTEM 1 (RANGE/PERFORMANCE), Diagnostic Trouble Code (DTC) Detecting Criteria.>

GD(H4DOTC)-22

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Q: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)

1. OUTLINE OF DIAGNOSIS

Detect functional errors of the front oxygen (A/F) sensor heater.

Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large when looking at en-

gine status such as deceleration fuel cut.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after 42000 ms or more have passed since the engine started.

(1)

Element cover (outer)

(3)

Sensor element

(4)

Sensor housing

(2)

Element cover (inner)

Secondary Parameters

Enable Conditions

Condition established time

≥ 42000 ms

Battery voltage

≥ 10.9 V

Heater current

Permitted

A/F sensor heater final control

Main energization status

Elapsed time after returning from the fuel cut

≥ 20000 ms

EN-08982

(1)

(2) (3)

(4)

GD(H4DOTC)-23

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgment
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 Judgment
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: 10000 ms

Judgment Value

Malfunction Criteria

Threshold Value

Front oxygen (A/F) sensor impedance

> 50 Ω

Judgment Value

Malfunction Criteria

Threshold Value

Front oxygen (A/F) sensor impedance

≤ 50 Ω