Subaru Legacy IV (2008 year). Service manual — part 217
GD(H4SO)-170
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: 2500 ms
Malfunction Indicator Light: 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: 128 ms
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts OFF signal
Low level
or
Terminal voltage level when EGR oper-
ates
Low level
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts OFF signal
High level
Terminal voltage level when EGR oper-
ates
High level
GD(H4SO)-171
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CQ: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(H4SO)-172
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: 2500 ms
Malfunction Indicator Light: 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: 128 ms
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts OFF signal
High level
or
Terminal voltage level when EGR oper-
ates
High level
Judgement Value
Malfunction Criteria
Threshold Value
Terminal voltage level when ECM out-
puts OFF signal
Low level
Terminal voltage level when EGR oper-
ates
Low level
GD(H4SO)-173
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CR: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(H4SO)-169, DTC P1492 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
CS: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(H4SO)-171, DTC P1493 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Trouble Code (DTC) Detecting
Criteria.>
CT: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(H4SO)-169, DTC P1492 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
CU: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(H4SO)-171, DTC P1493 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Trouble Code (DTC) Detecting
Criteria.>
CV: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(H4SO)-169, DTC P1492 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
CW: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(H4SO)-171, DTC P1493 EGR SOLENOID
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Trouble Code (DTC) Detecting
Criteria.>
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