Subaru Legacy IV (2008 year). Service manual — part 639
GD(H6DO)-176
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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:4 ms × 625 time(s)
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:4 ms × 2 time(s)
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts OFF signal
Low level
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts OFF signal
High level
GD(H6DO)-177
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DL:DTC P1493 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION
(HIGH INPUT)
1. OUTLINE OF DIAGNOSIS
• Detects open or short circuit of EGR.
• Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Engine control module (ECM)
(3)
Detecting circuit
(5)
Battery voltage
(2)
Computer unit (CPU)
(4)
Switch circuit
(6)
Main relay
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 1 second
EGR valve target position
> 0 step
Battery voltage
t 10.9 V
EN-02051
(1)
(2)
(3)
(4)
(5)
(6)
GD(H6DO)-178
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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:4 ms × 625 time(s)
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:4 ms × 2 time(s)
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts ON signal
High level
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts ON signal
Low level
GD(H6DO)-179
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DM:DTC P1494 EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION
(LOW INPUT)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P1492. <Ref. to GD(H6DO)-175, DTC P1492 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
DN:DTC P1495 EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION
(HIGH INPUT)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P1493. <Ref. to GD(H6DO)-177, DTC P1493 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Trouble Code (DTC) Detecting
Criteria.>
DO:DTC P1496 EGR SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION
(LOW INPUT)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P1492. <Ref. to GD(H6DO)-175, DTC P1492 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
DP:DTC P1497 EGR SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION
(HIGH INPUT)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P1493. <Ref. to GD(H6DO)-177, DTC P1493 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Trouble Code (DTC) Detecting
Criteria.>
DQ:DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION
(LOW INPUT)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P1492. <Ref. to GD(H6DO)-175, DTC P1492 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
DR:DTC P1499 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION
(HIGH INPUT)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P1493. <Ref. to GD(H6DO)-177, DTC P1493 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Trouble Code (DTC) Detecting
Criteria.>
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