Subaru Legacy IV (2008 year). Manual - part 640

GD(H6DO)-180

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DS:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

1. OUTLINE OF DIAGNOSIS

Detect the open/short circuit of back-up power supply circuit.
Judge as NG when the backup power voltage is low.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. 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: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• 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

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Voltage of back-up power supply

Low

Battery voltage

t 10.9 V

Engine condition

After engine starting

Judgement Value

Malfunction Criteria

Threshold Value

Voltage of back-up power supply

High

Battery voltage

t 10.9 V

Engine condition

After engine starting

GD(H6DO)-181

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DT:DTC P1570 ANTENNA

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

DU:DTC P1571 REFERENCE CODE INCOMPATIBILITY

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

DV:DTC P1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA CIRCUIT)

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

DW:DTC P1574 KEY COMMUNICATION FAILURE

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

DX:DTC P1576 EGI CONTROL MODULE EEPROM

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

DY:DTC P1577 IMM CONTROL MODULE EEPROM

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

DZ:DTC P1578 METER FAILURE

1. OUTLINE OF DIAGNOSIS

NOTE:
For the detection standard, refer to DTC P0513. <Ref. to GD(H6DO)-151, DTC P0513 INCORRECT IMMO-
BILIZER KEY, Diagnostic Trouble Code (DTC) Detecting Criteria.>

GD(H6DO)-182

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

EA:DTC P1602 CONTROL MODULE PROGRAMMING ERROR

1. OUTLINE OF DIAGNOSIS

Detect malfunctions of the catalyst advanced idling retard angle control.
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle
control.
Judge as NG if there is exhaust gas temperature diagnosis and idle speed diagnosis and if either of them is
NG.
• Exhaust gas temperature diagnosis
Judge as NG when the estimated exhausted gas temperature in 14 seconds after the cold start is below the
specified value.
• Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed after terminating the retard angle
control.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Perform the diagnosis at cold start.

Secondary Parameters

Enable Conditions

Atmospheric pressure

t 75 kPa (563 mmHg, 
22.2 inHg)

Battery voltage

t 10.9 V

Cold start diagnosis

Incomplete

Vehicle speed

< 2 km/h (1.2 MPH)

Misfire in 200 engine revs.

< 7 

Time after starting

= 14 seconds

GD(H6DO)-183

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

4. DIAGNOSTIC METHOD

• Exhaust gas temperature diagnosis

Abnormality Judgement
Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge
as NG when the following conditions are established after engine starting within the predetermined time.

Time Needed for Diagnosis: 14 seconds
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 following conditions are established.

Time Needed for Diagnosis: Less than 1 second

• Idle speed diagnosis

Abnormality Judgement
Judge as NG when the following conditions are established after the predetermined time.

Time Needed for Diagnosis: 14 seconds
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 following conditions are established.

Time Needed for Diagnosis: Less than 1 second

Judgement Value

Malfunction criteria

Threshold value

Estimated exhaust gas temperature

< Value from Map

Map

Coolant tempera-
ture after starting 
the engine

–40 °C

(–40 °F)

–30 °C

(–22 °F)

–20 °C
(–4 °F)

–10 °C
(14 °F)

0 °C

(32 °F)

10 °C

(50 °F)

20 °C

(68 °F)

30 °C

(86 °F)

40 °C

(104 °F)

50 °C

(122 °F)

Threshold Value

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

0 °C

(32 °F)

155 °C

(311 °F)

150 °C

(302 °F)

155 °C

(311 °F)

140 °C

(284 °F)

133 °C

(271.4 °F)

130 °C

(266 °F)

Judgement Value

Malfunction criteria

Threshold value

Estimated exhaust gas temperature

t Value from Map

Judgement Value

Malfunction criteria

Threshold value

Continuous time of (Target engine speed 
– Actual engine speed > –200 rpm)

t 6000 ms

Continuous time of (actual retard amount 
> 20 °CA)

t 0 ms

Judgement Value

Malfunction criteria

Threshold value

Continuous time of (Target engine speed 
– Actual engine speed > –200 rpm)

< 6000 ms

Continuous time of (actual retard amount 
> 20 °CA)

< 0 ms