Subaru Legacy III (2000-2003 year). Service manual — part 216
EN(H4SOw/oOBD)-54
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
2
CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from #1 cylinder fuel
injector.
3) Turn ignition switch to ON.
4) Measure power supply voltage between the
fuel injector terminal and engine ground.
Connector & terminal
#1 (E5) No. 2 (+) — Engine ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connector
(B22)
• Poor contact in
fuel injector con-
nector
3
CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from #2 cylinder fuel
injector.
3) Turn ignition switch to ON.
4) Measure power supply voltage between the
fuel injector terminal and engine ground.
Connector & terminal
#2 (E16) No. 2 (+) — Engine ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connector
(B22)
• Poor contact in
fuel injector con-
nector
4
CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from #3 cylinder fuel
injector.
3) Turn ignition switch to ON.
4) Measure power supply voltage between the
fuel injector terminal and engine ground.
Connector & terminal
#3 (E6) No. 2 (+) — Engine ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connec-
tors (B22)
• Poor contact in
fuel injector con-
nector
Step
Value
Yes
No
EN(H4SOw/oOBD)-55
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
5
CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from #4 cylinder fuel
injector.
3) Turn ignition switch to ON.
4) Measure power supply voltage between the
fuel injector terminal and engine ground.
Connector & terminal
#4 (E17) No. 2 (+) — Engine ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connec-
tors (B22)
• Poor contact in
fuel injector con-
nector
6
CHECK EACH FUEL INJECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between each fuel
injector terminals.
Terminals
No. 1 — No. 2:
Is the measured value within the specified
value?
11 — 12
Ω
Replace faulty fuel
injector.
7
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect connector from ECM.
2) Measure resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 4 — (B136) No. 2:
Is the measured value within the specified
value?
11 — 12
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
8
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 4 — Chassis ground:
Is the measured value less than the specified
value?
1
Ω
Repair ground
short circuit in har-
ness between
ECM and fuel
injector connector.
9
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 13 — (B136) No. 2:
Is the measured value within the specified
value?
11 — 12
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
Step
Value
Yes
No
EN(H4SOw/oOBD)-56
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
10
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 13 — Chassis ground:
Is the measured value less than the specified
value?
1
Ω
Repair ground
short circuit in har-
ness between
ECM and fuel
injector connector.
11
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 14 — (B136) No. 2:
Is the measured value within the specified
value?
11 — 12
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
12
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 14 — Chassis ground:
Is the measured value less than the specified
value?
1
Ω
Repair ground
short circuit in har-
ness between
ECM and fuel
injector connector.
13
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 15 — (B136) No. 2:
Is the measured value within the specified
value?
11 — 12
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
14
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 15 — Chassis ground:
Is the measured value less than the specified
value?
1
Ω
Repair ground
short circuit in har-
ness between
ECM and fuel
injector connector.
15
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
Inspection using
“General Diagnos-
tic Table”. <Ref. to
EN(H4SOw/
oOBD)-102,
INSPECTION,
General Diagnos-
tic Table.>
Step
Value
Yes
No
EN(H4SOw/oOBD)-57
ENGINE (DIAGNOSTICS)
LIST OF DIAGNOSTIC TROUBLE CODE (DTC)
13.List of Diagnostic Trouble Code (DTC)
A: LIST
Trouble
code
Item
Contents of diagnosis
Index
11
Crankshaft position sen-
sor
• No signal entered from crankshaft
position sensor when starter switch is
ON.
• The harness connector between
ECM and crankshaft position sensor
is in short or open.
12
Starter switch
• The starter switch signal is abnor-
mal.
• The harness connector between
ECM and starter switch is in short or
open.
13
Camshaft position sensor
• No signal entered from camshaft
position sensor, but signal entered
from crankshaft position sensor.
• The harness connector between
ECM and camshaft position sensor is
in short or open.
21
Engine coolant tempera-
ture sensor
• The engine coolant temperature
sensor signal is abnormal.
• The harness connector between
ECM and engine coolant temperature
sensor is in short or open.
22
Knock sensor
• The knock sensor signal is abnor-
mal.
• The harness connector between
ECM and knock sensor is in short or
open.
24
Idle air control solenoid
valve
• The idle air control solenoid valve is
not in function.
• The harness connector between
ECM and idle air control solenoid
valve is in short or open.
26
Intake temperature sen-
sor
• The intake air temperature sensor
signal is abnormal.
• The harness connector between
ECM and intake air temperature sen-
sor is in short or open.
31
Throttle position sensor
• The throttle position sensor signal
is abnormal.
• The throttle position sensor is
installed abnormally.
• The harness connector between
ECM and throttle position sensor is in
short or open.
32
Oxygen sensor
• The oxygen sensor is not in func-
tion.
• The harness connector between
ECM and oxygen sensor is in short or
open.
33
Vehicle speed signal
• The vehicle speed signal is abnor-
mal.
• The harness connector between
ECM and vehicle speed sensor is in
short or open.
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