Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 214
EN(H4DOTC)(diag)-80
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
D: IGNITION CONTROL SYSTEM
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
Step
Check
Yes
No
1
CHECK SPARK PLUG CONDITION.
1) Remove the spark plug. <Ref. to IG(STI)-4,
REMOVAL, Spark Plug.> <Ref. to IG(w/o STI)-
5, REMOVAL, Spark Plug.>
2) Check the spark plug condition. <Ref. to
IG(STI)-5, INSPECTION, Spark Plug.> <Ref. to
IG(w/o STI)-6, INSPECTION, Spark Plug.>
Is the spark plug condition nor-
mal?
Replace the spark
plug. <Ref. to
IG(STI)-4, Spark
Plug.> <Ref. to
IG(w/o STI)-5,
Spark Plug.>
ECM
EN-08716
B72
B134
21
22
31
32
1
3
E2
B21
E31
E32
E33
E34
E34
E33
E32
E31
1
2
3
B21
3
1
2
3
1
2
9
49
20
31
10
3
1
2
3
1
2
B72
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44 45
47
46
49
48
51
50
53
52
54
B134
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
2
6
5
4
3
1
SBF-6
E
E
IGNITION COIL
No. 2
IGNITION COIL
No. 4
IGNITION COIL
No. 3
IGNITION COIL
No. 1
IGNITION
SWITCH
No. 12
MAIN
SBF
BATTERY
EN(H4DOTC)(diag)-81
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
2
CHECK IGNITION SYSTEM FOR SPARKS.
1) Connect the spark plug to ignition coil.
2) Release the fuel pressure. <Ref. to FU(STI)-
67, RELEASING OF FUEL PRESSURE, PRO-
CEDURE, Fuel.> <Ref. to FU(w/o STI)-65,
RELEASING OF FUEL PRESSURE, PROCE-
DURE, Fuel.>
3) Contact the spark plug thread portion to
engine.
4) While opening the throttle valve fully, crank
the engine to check that spark occurs at each
cylinder.
Does spark occur at each cylin-
der?
3
CHECK IGNITION COIL POWER SUPPLY
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ignition coil.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
ignition coil connector and engine ground.
Connector & terminal
(E31) No. 3 (+) — Engine ground (–):
(E32) No. 3 (+) — Engine ground (–):
(E33) No. 3 (+) — Engine ground (–):
(E34) No. 3 (+) — Engine ground (–):
Is the voltage 10 V or more?
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit or
short circuit to
ground in power
supply circuit
• Poor contact of
coupling connector
• Blown out of fuse
4
CHECK HARNESS OF IGNITION COIL
GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ignition
coil connector and engine ground.
Connector & terminal
(E31) No. 2 — Engine ground:
(E32) No. 2 — Engine ground:
(E33) No. 2 — Engine ground:
(E34) No. 2 — Engine ground:
Is the resistance less than 1 Ω? Go to step
Repair the open
circuit in harness
between ignition
coil connector and
engine ground.
5
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
ignition coil.
3) Measure the resistance of harness between
ECM connector and ignition coil connector.
Connector & terminal
(B134) No. 21 — (E31) No. 1:
(B134) No. 22 — (E32) No. 1:
(B134) No. 31 — (E33) No. 1:
(B134) No. 32 — (E34) No. 1:
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 of
harness between
ECM
connector
and the ignition coil
connector
• Poor contact of
coupling connector
6
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
Measure the resistance of harness between
ECM connector and engine ground.
Connector & terminal
(B134) No. 21 — Engine ground:
(B134) No. 22 — Engine ground:
(B134) No. 31 — Engine ground:
(B134) No. 32 — Engine ground:
Is the resistance 1 MΩ or
more?
Repair the ground
short circuit of har-
ness between
ECM connector
and ignition coil
connector.
Step
Check
Yes
No
EN(H4DOTC)(diag)-82
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
E: FUEL PUMP CIRCUIT
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
7
CHECK FOR POOR CONTACT.
Check for poor contact of ECM connector.
Is there poor contact of ECM
connector?
Repair the poor
contact of ECM
connector.
Step
Check
Yes
No
1
CHECK OPERATING SOUND OF FUEL
PUMP.
Make sure that the fuel pump operates for two
seconds when turning the ignition switch to ON.
NOTE:
Fuel pump operation can be executed using the
Subaru Select Monitor.
For the procedures, refer to “Compulsory Valve
Operation
EN(H4DOTC)(diag)-64, Compulsory Valve Op-
eration Check Mode.>
Does the fuel pump emit oper-
ating sound?
Display the DTC.
<Ref. to
EN(H4DOTC)(diag)
-48, OPERATION,
Read Diagnostic
Trouble Code
(DTC).>
Step
Check
Yes
No
EN(H4DOTC)(diag)-83
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
F: FUEL INJECTOR CIRCUIT
CAUTION:
• Check or repair only faulty parts.
• After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
63, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PRO-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
EN-08718
#4
2
1
#3
2
1
#2
2
1
B21
#1
2
1
4
8
54
53
52
51
10
11
12
13
1 2
B21
E5
E5
E2
E6
E6
E16
E16
E17
E17
B134
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44 45
47
46
49
48
51
50
53
52
54
B220
24
23
22
15A
B220
3
4
21
B134
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
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
E
SBF-7
MAIN RELAY
FUSE
(RELAY BLOCK)
FUEL INJECTOR
BATTERY
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст