Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 306
EN(H4DOTC)(diag)-448
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
• Models with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine Electrical System.>
Step
Check
Yes
No
1
CHECK SECONDARY AIR COMBINATION
VALVE FUSE.
Check if the secondary air combination valve
fuse (10 A) is blown out.
Is the fuse blown out?
EN-08735
F9
13
12
11
14
1
2
2
1
3
4
16
15
5
6
B143
F37
B144
B21
E2
E40
E41
B134
A:
A:
B135
B:
B135
B:
B137
D:
F37
F11
F9
10A
60A
9
10
8
7
11
5
20
8
B8
B20
B27
A19
D9
A29
6
1
2
8
47
3
2
1
6
4
1
2
9
2
16
18
14
12
10
4
14
4
B134
46
B220
24
23
22
21
B137
D:
31
30
29
28
27
21
20
19
18
17
16
26
25
24
15
14
13
12
11
23
22
10
3
4
9
1
2
8
7
6
5
F11
1 2
29
4
3
1
2
7
6
5
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
B220
18
19
6
7
4
3
5
2
1
12
11
10
9
8
40
36 39
38
37
34
33
35
32
28 31
30
29
23
22
21
20
26
25
24
27
17
16
15
14
13
4
3
B220
15A
16
15
8
7
4
14
13
11
12
10
9
2
1
3
6
5
B143
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
F37
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
B144
3
8
2
6
7
1
5
4
9
31
30
32
29
34
33
21
20
19
18
17
16
28
27
26
15
14
13
12
11
25
23
22
24
10
3
4
9
1
2
8
7
6
5
E40
2
6
5
4
3
1
E41
2
1
54
52 53
50 51
48 49
46 47
45
44
42 43
40 41
38 39
36 37
34 35
33
32
31
30
29
28
27
26
25
24
23
22
21
20
11
10
9
19
18
17
16
8
7
6
5
15
14
13
12
4
3
2
1
B21
E
E
E
ECM
SBF-7
FUSE
(RELAY BLOCK)
MAIN SBF
MAIN RELAY
SECONDARY
AIR COMBINATION
VALVE RELAY 2
SECONDARY
AIR PUMP
RELAY
SECONDARY
AIR COMBINATION
VALVE RH
SECONDARY
AIR COMBINATION
VALVE LH
(WITH BUILT-IN
PRESSURE SENSOR)
SECONDARY
AIR COMBINATION
VALVE RELAY 1
SECONDARY
AIR PUMP
MAIN FUSE BOX
(M/B)
RELAY HOLDER
BATTERY
EN(H4DOTC)(diag)-449
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
2
CHECK HARNESS BETWEEN FUSE BOX
AND SECONDARY AIR COMBINATION
VALVE RH CONNECTOR.
1) Remove the secondary air combination
valve fuse (10 A) from the fuse box.
2) Disconnect the connector from the second-
ary air combination valve RH.
3) Measure the resistance between the sec-
ondary air combination valve fuse and second-
ary air combination valve RH connector, and
chassis ground.
Connector & terminal
Models without SI-DRIVE
(F9) No. 5 — Chassis ground:
(E41) No. 6 — Chassis ground:
Models with SI-DRIVE
(F9) No. 5 — Chassis ground:
(E41) No. 2 — Chassis ground:
Is the resistance 1 MΩ or
more?
Replace the fuse
with a new part,
and connect the
secondary air com-
bination valve RH
connector.
Go to step
Repair the short
circuit to ground in
harness between
the fuse box and
the secondary air
combination valve
RH connector.
3
CHECK SECONDARY AIR COMBINATION
VALVE RH OPERATION.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Perform operation check for the secondary
air combination valve RH using the Subaru
Select Monitor.
NOTE:
Does the secondary air combi-
nation valve RH repeatedly
switch to ON and OFF?
4
CHECK DUCT BETWEEN SECONDARY AIR
PUMP AND SECONDARY AIR COMBINA-
TION VALVE RH.
Check the duct between the secondary air
pump and secondary air combination valve RH.
Is there damage, clog or dis-
connection of the duct?
Replace, clean or
connect the duct.
5
CHECK PIPE BETWEEN SECONDARY AIR
COMBINATION VALVE RH AND CYLINDER
HEAD.
Check the pipe between the secondary air com-
bination valve RH and cylinder head.
Is there damage, clog or dis-
connection of the pipe?
Replace, clean or
connect the pipe.
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector,
temporary open or
short circuit of har-
ness may be the
cause.
Step
Check
Yes
No
EN(H4DOTC)(diag)-450
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
6
CHECK POWER SUPPLY TO SECONDARY
AIR COMBINATION VALVE RH.
1) Disconnect the connector from the second-
ary air combination valve RH.
2) In the condition of step 3, measure the volt-
age between secondary air combination valve
RH connector and chassis ground.
Connector & terminal
Models without SI-DRIVE
(E41) No. 6 (+) — Chassis ground (–):
Models with SI-DRIVE
(E41) No. 2 (+) — Chassis ground (–):
Does the voltage repeatedly
change between 10 V and 0 V?
7
CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE RH AND CHAS-
SIS GROUND.
Measure the resistance between the secondary
air combination valve RH connector and chas-
sis ground.
Connector & terminal
Models without SI-DRIVE
(E41) No. 4 — Chassis ground:
Models with SI-DRIVE
(E41) No. 1 — Chassis ground:
Is the resistance less than 5 Ω? • Models without
• Models with SI-
DRIVE: Go to step
14.
Repair the open
circuit in harness
between second-
ary air combination
valve RH connec-
tor and chassis
ground.
8
CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE RELAY 1 AND
SECONDARY AIR COMBINATION VALVE
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air combination
valve relay 1 from the relay box.
3) Measure the resistance of the harness
between secondary air combination valve relay
1 connector and secondary air combination
valve RH connector.
Connector & terminal
(F9) No. 3 — (E41) No. 6:
Is the resistance less than 1 Ω? Go to step
Repair the open
circuit in harness
between second-
ary air combination
valve relay 1 and
secondary air com-
bination valve RH
connector.
9
CHECK SECONDARY AIR COMBINATION
VALVE RELAY 1.
1) Connect the battery to terminals No. 1 and
No. 2 of the secondary air combination valve
relay 1.
2) Measure the resistance between the sec-
ondary air combination valve relay 1 terminals.
Terminals
No. 3 — No. 4:
Is the resistance less than 1 Ω? Go to step
10
CHECK SECONDARY AIR COMBINATION
VALVE RELAY 1.
Measure the resistance between the secondary
air combination valve relay 1 terminals with the
battery disconnected.
Terminals
No. 3 — No. 4:
Is the resistance 1 MΩ or
more?
Step
Check
Yes
No
EN(H4DOTC)(diag)-451
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
11
CHECK SECONDARY AIR COMBINATION
VALVE RELAY 1 POWER SUPPLY.
1) Turn the ignition switch to ON.
2) Measure the voltage between the second-
ary air combination valve relay 1 connector and
chassis ground.
Connector & terminal
(F9) No. 4 (+) — Chassis ground (–):
(F9) No. 1 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the open or
ground short circuit
of power supply
circuit.
12
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY 1 CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the ECM connector.
3) Measure the resistance of harness between
ECM connector and secondary air combination
valve relay 1 connector.
Connector & terminal
(B135) No. 8 — (F9) No. 2:
Is the resistance less than 1 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and secondary air
combination valve
relay 1 connector
• Poor contact of
coupling connector
13
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY 1 CONNECTOR.
Measure the resistance between the secondary
air combination valve relay 1 connector and
chassis ground.
Connector & terminal
(F9) No. 2 — Chassis ground:
Is the resistance 1 MΩ or
more?
Repair the poor
contact of ECM
connector.
Repair the short
circuit to ground in
harness between
ECM connector
and secondary air
combination valve
relay 1 connector.
14
CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE RELAY 2 AND
SECONDARY AIR COMBINATION VALVE
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air combination
valve relay 2 from the relay box.
3) Measure the resistance of the harness
between secondary air combination valve relay
2 connector and secondary air combination
valve RH connector.
Connector & terminal
(F9) No. 8 — (E41) No. 2:
Is the resistance less than 1 Ω? Go to step
Repair the open
circuit in harness
between second-
ary air combination
valve relay 2 and
secondary air com-
bination valve RH
connector.
15
CHECK SECONDARY AIR COMBINATION
VALVE RELAY 2.
1) Connect the battery to terminals No. 9 and
No. 10 of the secondary air combination valve
relay 2.
2) Measure the resistance between the sec-
ondary air combination valve relay 2 terminals.
Terminals
No. 7 — No. 8:
Is the resistance less than 1 Ω? Go to step
16
CHECK SECONDARY AIR COMBINATION
VALVE RELAY 2.
Measure the resistance between the secondary
air combination valve relay 2 terminals with the
battery disconnected.
Terminals
No. 7 — No. 8:
Is the resistance 1 MΩ or
more?
Step
Check
Yes
No
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст