Subaru Legacy IV (2008 year). Service 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
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