Subaru Legacy III (2000-2003 year). Service manual — part 471
EN(H4DOSTC)-54
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
7
CHECK TRANSMISSION TYPE.
Is the target AT vehicle?
Target is AT vehicle.
Repair open or
ground short cir-
cuit in harness
between starter
motor and ignition
switch.
8
CHECK INPUT VOLTAGE OF INHIBITOR
SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from inhibitor
switch.
3) Connect the connector to ignition switch.
4) Measure the input voltage between inhibitor
switch connector terminal and engine
ground while turning ignition switch to ST.
Connector & terminal
(B12) No. 12 (+) — Engine ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Repair open or
ground short cir-
cuit in harness
between inhibitor
switch and ignition
switch.
9
CHECK INHIBITOR SWITCH.
1) Place the selector lever in the “P” or “N”
position.
2) Measure the resistance between inhibitor
switch terminals.
Connector & terminal
(T3) No. 11 — No. 12:
Is the measured value less than specified
value?
1
Ω
Repair open or
ground short cir-
cuit in harness
between inhibitor
switch and starter
motor.
Replace the inhibi-
tor switch. <Ref. to
AT-50,
REMOVAL, Inhibi-
tor Switch.>
Step
Value
Yes
No
EN(H4DOSTC)-55
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
MEMO:
EN(H4DOSTC)-56
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
C: CONTROL MODULE POWER SUPPLY AND GROUND LINE
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(H4DOSTC)-
35, Clear Memory Mode.> and INSPECTION MODE. <Ref. to EN(H4DOSTC)-33, Inspection Mode.>
• WIRING DIAGRAM:
EN-00931
B72
B137
3 4
1 2
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
BATTERY
IGNITION
SWITCH
MAIN RELAY
SBF-4
SBF-1
SBF-5
B72
TO FRONT OXYGEN(A/F) SENSOR
A2
D8
D9
A22
C17
C8
C18
A7
A15
E1
A12
D2
D3
D10
A14
No.11
B47
E3
B22
1
2
3
5
6
4
ECM
E
E
1
4
B134
B136
B137
A :
C :
D :
B84
E :
3
15
16
14
13
E
3
4
1
2
5
6
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B134
B22
B47
B84
B136
1 2 3 4
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
1 2 3
8 9 10
4
11 12
13 14 15
16
5 6
7
17
EN(H4DOSTC)-57
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
Step
Value
Yes
No
1
CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main relay.
3) Connect the battery to main relay terminals
No. 1 and No. 2.
4) Measure the resistance between main relay
terminals.
Terminals
No. 3 — No. 5:
No. 4 — No. 6:
Is the measured value less than the speci-
fied value?
10
Ω
Replace the main
relay.
2
CHECK GROUND CIRCUIT OF ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B134) No. 7 — Chassis ground:
(B134) No. 12 — Chassis ground:
(B134) No. 15 — Chassis ground:
(B134) No. 22 — Chassis ground:
(B136) No. 8 — Chassis ground:
(B136) No. 17 — Chassis ground:
(B136) No. 18 — Chassis ground:
(B137) No. 8 — Chassis ground:
(B137) No. 9 — Chassis ground:
(B84) No. 1 — Chassis ground:
Is the measured value less than the speci-
fied value?
5
Ω
Repair the open
circuit in harness
between ECM
connector and
engine grounding
terminal.
3
CHECK INPUT VOLTAGE OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B137) No. 10 (+) — Chassis ground (–):
Does the measured value exceed the specified
value?
10 V
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
4
CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 14 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
5
CHECK HARNESS BETWEEN ECM AND
MAIN RELAY CONNECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 2 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in har-
ness between
ECM connector
and main relay
connector.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст