ON-BORAD DIAGNOSTICS II SYSTEM [T8A0] 2-7

8. Diagnostics for Engine Starting Failure

8. Diagnostics for Engine Starting Failure

A: BASIC DIAGNOSTICS CHART
1. Inspection of starter motor circuit. <Ref. to 2-7 [T8B0].>
↓
2. Inspection of ECM power supply and ground line. <Ref. to 2-7 [T8C0].>
↓
3. Inspection of ignition control system. <Ref. to 2-7 [T8D0].>
↓
4. Inspection of fuel pump circuit. <Ref. to 2-7 [T8E0].> <Ref. to 2-7 [T8F0].>
↓
5. Inspection of fuel injector circuit. <Ref. to 2-7 [T8G0].>
↓
6. Inspection of crankshaft position sensor circuit. <Ref. to 2-7 [T8H0].>
↓
7. Inspection of camshaft position sensor circuit. <Ref. to 2-7 [T8I0].>
↓
8. Inspection using Subaru select monitor or OBD-II general scan tool <Ref. to 2-7 [T1000].> and <Ref. to 2-7 [T1100].> or
inspection using “9. General Diagnostics Table”. <Ref. to 2-7 [T900].>

87
2-7 [T8B0] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

B: STARTER MOTOR CIRCUIT

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:

B2M1897

8B1 : CHECK INPUT SIGNAL FOR

STARTER MOTOR.

1) Turn ignition switch to OFF.

2) Disconnect connector from starter motor.

OBD0724

3) Turn ignition switch to ST.

88
 ON-BORAD DIAGNOSTICS II SYSTEM [T8B5] 2-7
8. Diagnostics for Engine Starting Failure

4) Measure power supply voltage between starter 8B3 : CHECK HARNESS BETWEEN BAT-
motor connector terminal and engine ground. TERY AND IGNITION SWITCH CON-
Connector & terminal NECTOR.
(B14) No. 1 (+) — Engine ground (−):
1) Turn ignition switch to OFF.
2) Remove SBF No. 4 from main fuse box.
3) Measure resistance of fuse.
: Is resistance less than 1 Ω?
: Replace SBF No. 4.
: Go to step 8B4.

8B4 : CHECK HARNESS BETWEEN BAT-

TERY AND IGNITION SWITCH CON-
OBD0100A
NECTOR.
NOTE:
I On AT vehicles, place the selector lever in the 1) Install SBF No. 4 to main fuse box.
“P” or “N” position. 2) Turn ignition switch to ON.
I On MT vehicles, depress the clutch pedal. 3) Measure power supply voltage between ignition
switch connector and chassis ground.
: Is the voltage more than 10 V?
Connector & terminal
: Go to step 8B2.
(B72) No. 1 (+) — Chassis ground (−):
: Go to step 8B3.

8B2 : CHECK GROUND CIRCUIT OF

STARTER MOTOR.

1) Turn ignition switch to OFF.

2) Disconnect terminal from starter motor.

OBD0103A

: Is the voltage more than 10 V?

: Go to step 8B5.
: Repair open circuit in harness between
ignition switch and SBF No. 4 connector.

OBD0725
8B5 : CHECK TRANSMISSION TYPE.
3) Measure resistance of ground cable between
ground cable terminal and engine ground. : Is transmission type AT?
: Is resistance less than 5 Ω? : Go to step 8B6.
: Check starter motor. <Ref. to 6-1 : Go to step 8B9.
[K100].>
: Repair open circuit of ground cable.

89
2-7 [T8B6] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8B6 : CHECK INHIBITOR SWITCH CIRCUIT. 8B8 : CHECK TRANSMISSION HARNESS.

1) Turn ignition switch to OFF. Measure resistance of harness between transmis-

2) Place the selector lever in the “P” or “N” posi- sion harness and inhibitor switch connector.
tion. Connector & terminal
3) Measure resistance between transmission har- (T3) No. 12 — (T7) No. 1:
ness connector receptacle’s terminals.
Connector & terminal
(T3) No. 11 — No. 12:

B2M1281A

: Is the resistance less than 1 Ω?

B2M1279A
: Go to step 8B9.
: Repair open circuit in harness between
: Is the resistance less than 1 Ω?
transmission harness and inhibitor
: Repair open circuit in harness between switch connector.
starter motor and ignition switch con-
nector.
8B9 : CHECK POOR CONTACT.
: Go to step 8B7.
Check poor contact in inhibitor switch connector.
8B7 : CHECK TRANSMISSION HARNESS. <Ref. to FOREWORD [T3C1].>
: Is there poor contact in inhibitor
1) Disconnect connector from inhibitor switch. switch connector?
2) Measure resistance of harness between trans-
mission harness and inhibitor switch connector. : Repair poor contact in inhibitor switch
connector.
Connector & terminal
: Replace inhibitor switch.
(T3) No. 11 — (T7) No. 2:

B2M1280A

: Is the resistance less than 1 Ω?

: Go to step 8B8.
: Repair open circuit in harness between
transmission harness and inhibitor
switch connector.

90
 ON-BORAD DIAGNOSTICS II SYSTEM [T8B11] 2-7
8. Diagnostics for Engine Starting Failure

8B10 : CHECK STARTER INTERLOCK CIR- 8B11 : CHECK STARTER INTERLOCK CIR-
CUIT. CUIT.

1) Turn ignition switch to “ST”. 1) Turn ignition switch to OFF.

2) Measure voltage between clutch switch con- 2) Measure resistance between clutch switch con-
nector and chassis ground. nector terminals while depressing the clutch pedal.
Connector & terminal Connector & terminal
I With cruise control I With cruise control
(B107) No. 2 (+) — Chassis ground (−): (B107) No. 1 — No. 2:
I Without cruise control I Without cruise control
(B106) No. 2 (+) — Chassis ground (−): (B106) No. 1 — No. 2:

B2M0517A B2M0518A

: Is the voltage more than 10 V? : Is the resistance less than 10 Ω?

: Replace starter interlock relay. : Repair open circuit in harness between
starter motor and ignition switch con-
: Go to step 8B11. nector.
: Replace clutch switch.

91
2-7 [T8C0] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

C: CONTROL MODULE POWER SUPPLY AND GROUND LINE

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:

B2M1049

8C1 : CHECK MAIN RELAY. 4) Measure resistance between main relay termi-
nals.
1) Turn the ignition switch to OFF. Terminals
2) Remove main relay. No. 3 — No. 5:
3) Connect battery to main relay terminals No. 1
and No. 2.

H2M2268

: Is the resistance less than 10 Ω?

: Go to step 8C2.
: Replace main relay.

92
 ON-BORAD DIAGNOSTICS II SYSTEM [T8C4] 2-7
8. Diagnostics for Engine Starting Failure

8C2 : CHECK MAIN RELAY. 8C4 : CHECK POWER SUPPLY CIRCUIT OF

ECM.
Measure resistance between main relay terminals.
Measure power supply voltage between ECM con-
Terminals
nector terminals.
No. 4 — No. 6:
Connector & terminal
(B84) No. 2 (+) — No. 19 (−):

H2M2269

: Is the resistance less than 10 Ω? H2M2271

: Go to step 8C3.
: Is the voltage more than 10 V?
: Replace main relay.
: Go to step 8C5.
8C3 : CHECK POWER SUPPLY CIRCUIT OF : Repair open or ground short circuit in
ECM. harness of power supply circuit.

1) Install main relay.

2) Disconnect connectors from ECM.
3) Turn ignition switch to ON.
4) Measure power supply voltage between ECM
connector terminals.
Connector & terminal
(B84) No. 1 (+) — No. 19 (−):

H2M2270A

: Is the voltage more than 10 V?

: Go to step 8C4.
: Repair open or ground short circuit in
harness of power supply circuit.

93
2-7 [T8C5] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8C5 : CHECK POWER SUPPLY CIRCUIT OF 8C6 : CHECK GROUND CIRCUIT OF ECM.
ECM.
1) Turn ignition switch to OFF.
Measure power supply voltage between ECM con- 2) Measure resistance of harness connector
nector terminals. between ECM and chassis ground.
Connector & terminal Connector & terminal
(B84) No. 39 (+) — No. 19 (−): (B84) No. 17 — Chassis ground:

H2M2273A

: Is the resistance less than 5 Ω?

: Go to step 8C7.
: Repair open circuit in harness between
ECM connector and engine grounding
terminal.

8C7 : CHECK GROUND CIRCUIT OF ECM.

H2M2272A Measure resistance of harness between ECM and

chassis ground.
: Is the voltage more than 10 V?
Connector & terminal
: Go to step 8C6. (B84) No. 18 — Chassis ground:
: Repair open or ground short circuit in
harness of power supply circuit.

H2M2274A

: Is the resistance less than 5 Ω?

: Go to step 8C8.
: Repair open circuit in harness between
ECM connector and engine grounding
terminal.

94
 ON-BORAD DIAGNOSTICS II SYSTEM [T8C11] 2-7
8. Diagnostics for Engine Starting Failure

8C8 : CHECK GROUND CIRCUIT OF ECM. 8C10 : CHECK GROUND CIRCUIT OF ECM.

Measure resistance of harness between ECM and Measure resistance of harness between ECM and
chassis ground. chassis ground.
Connector & terminal Connector & terminal
(B84) No. 19 — Chassis ground: (B84) No. 42 — Chassis ground:

H2M2275A H2M2277A

: Is the resistance less than 5 Ω? : Is the resistance less than 5 Ω?

: Go to step 8C9. : Go to step 8C11.
: Repair open circuit in harness between : Repair open circuit in harness between
ECM connector and engine grounding ECM connector and engine grounding
terminal. terminal.

8C9 : CHECK GROUND CIRCUIT OF ECM. 8C11 : CHECK GROUND CIRCUIT OF ECM.

Measure resistance of harness between ECM and Measure resistance of harness between ECM and
chassis ground. chassis ground.
Connector & terminal Connector & terminal
(B84) No. 20 — Chassis ground: (B84) No. 46 — Chassis ground:

H2M2276A H2M2278A

: Is the resistance less than 5 Ω? : Is the resistance less than 5 Ω?

: Go to step 8C10. : Go to step 8C12.
: Repair open circuit in harness between : Repair open circuit in harness between
ECM connector and engine grounding ECM connector and engine grounding
terminal. terminal.

95
2-7 [T8C12] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8C12 : CHECK GROUND CIRCUIT OF ECM. 8C14 : CHECK GROUND CIRCUIT OF ECM.

Measure resistance of harness between ECM and Measure resistance of harness between ECM and
chassis ground. chassis ground.
Connector & terminal Connector & terminal
(B84) No. 69 — Chassis ground: (B84) No. 95 — Chassis ground:

H2M2279A H2M2281A

: Is the resistance less than 5 Ω? : Is the resistance less than 5 Ω?

: Go to step 8C13. : Check ignition control system. <Ref. to
2-7 [T8D0].>
: Repair open circuit in harness between
: Repair open circuit in harness between
ECM connector and engine grounding
ECM connector and engine grounding
terminal. terminal.

8C13 : CHECK GROUND CIRCUIT OF ECM.

Measure resistance of harness between ECM and

chassis ground.
Connector & terminal
(B84) No. 94 — Chassis ground:

H2M2280A

: Is the resistance less than 5 Ω?

: Go to step 8C14.
: Repair open circuit in harness between
ECM connector and engine grounding
terminal.

96
 ON-BORAD DIAGNOSTICS II SYSTEM [T8C14] 2-7
8. Diagnostics for Engine Starting Failure

MEMO:

97
2-7 [T8D0] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

D: IGNITION CONTROL SYSTEM

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:

B2M0522

8D1 : CHECK IGNITION SYSTEM FOR 4) While opening throttle valve fully, crank engine
SPARKS. to check that spark occurs at each cylinder.

1) Remove plug cord cap from each spark plug.

2) Install new spark plug on plug cord cap.
CAUTION:
Do not remove spark plug from engine.
3) Contact spark plug’s thread portion on engine.

OBD0727B

B2M0644B

: Does spark occur at each cylinder?

: Check fuel pump system. <Ref. to 2-7
[T8E0].> or <Ref. to 2-7 [T8F0].>
: Go to step 8D2.

98
 ON-BORAD DIAGNOSTICS II SYSTEM [T8D5] 2-7
8. Diagnostics for Engine Starting Failure

8D2 : CHECK POWER SUPPLY CIRCUIT 8D4 : CHECK IGNITION COIL.

FOR IGNITION COIL.
Measure resistance between ignition coil terminals
1) Turn ignition switch to OFF. to check primary coil.
2) Disconnect connector from ignition coil. Terminals
3) Turn ignition switch to ON. No. 2 — No. 3:
4) Measure power supply voltage between ignition
coil connector and engine ground.
Connector & terminal
(E12) No. 2 (+) — Engine ground (−):

H2M2283

: Is the resistance between 0.4 and 1.0

Ω?
OBD0123A
: Go to step 8D5.
: Replace ignition coil.
: Is the voltage more than 10 V?
: Go to step 8D3.
8D5 : CHECK IGNITION COIL.
: Repair open or ground short circuit in
harness between ignition coil and igni-
tion switch connector. Measure resistance between spark plug cord con-
tact portions to check secondary coil.
8D3 : CHECK IGNITION COIL. Terminals
#1 — #2:
Measure resistance between ignition coil terminals
to check primary coil.
Terminals
No. 2 — No. 1:

B2M1050B

: Is the resistance between 10 and 15

kΩ?
: Go to step 8D6.
H2M2282
: Replace ignition coil.
: Is the resistance between 0.4 and 1.0
Ω?
: Go to step 8D4.
: Replace ignition coil.

99
2-7 [T8D6] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8D6 : CHECK IGNITION COIL. 8D8 : CHECK HARNESS BETWEEN IGNI-

TOR AND IGNITION COIL CONNEC-
TOR.
Measure resistance between spark plug cord con-
tact portions to check secondary coil.
Measure resistance of harness between ignition
Terminals
coil and ignitor connector.
#3 — #4:
Connector & terminal
(B13) No. 6 — (E12) No. 3:

B2M1050B

: Is the resistance between 10 and 15 H2M2285A

kΩ?
: Go to step 8D7. : Is the resistance less than 1 Ω?
: Replace ignition coil. : Go to step 8D10.
: Go to step 8D9.
8D7 : CHECK HARNESS BETWEEN IGNI-
TOR AND IGNITION COIL CONNEC- 8D9 : CHECK POOR CONTACT.
TOR.
Check poor contact in coupling connector (B22).
1) Turn ignition switch to OFF. <Ref. to FOREWORD [T3C1].>
2) Disconnect connector from ignitor. : Is there poor contact in coupling con-
3) Measure resistance of harness connector nector (B22)?
between ignition coil and ignitor.
: Repair poor contact in coupling connec-
Connector & terminal tor (B22).
(B13) No. 5 — (E12) No. 1:
: Repair open circuit in harness between
ignition coil and ignitor connector.

H2M2284A

: Is the resistance less than 1 Ω?

: Go to step 8D8.
: Go to step 8D9.

100
 ON-BORAD DIAGNOSTICS II SYSTEM [T8D13] 2-7
8. Diagnostics for Engine Starting Failure

8D10 : CHECK INPUT SIGNAL FOR IGNI- 8D12 : CHECK HARNESS OF IGNITOR
TOR. GROUND CIRCUIT.

Check if voltage varies synchronously with engine 1) Turn ignition switch to OFF.
speed when cranking, while monitoring voltage 2) Measure resistance between ignitor and engine
between ignitor connector and engine ground. ground.
Connector & terminal: Connector & terminal
(B13) No. 1 (+) — Engine ground (−): (B13) No. 3 — Engine ground:

H2M2286A OBD0128A

: Is the voltage more than 10 V? : Is the resistance less than 5 Ω?

: Go to step 8D11. : Go to step 8D13.
: Replace ignitor. : Repair harness and connector.
NOTE:
8D11 : CHECK INPUT SIGNAL FOR IGNI- In this case, repair the following:
TOR. I Open circuit in harness between ignitor connec-
tor and engine grounding terminal
Check if voltage varies synchronously with engine I Poor contact in coupling connector (B22)
speed when cranking, while monitoring voltage
between ignitor connector and engine ground. 8D13 : CHECK HARNESS BETWEEN ECM
AND IGNITOR CONNECTOR.
Connector & terminal:
(B13) No. 2 (+) — Engine ground (−):
1) Disconnect connector from ECM.
2) Measure resistance of harness connector
between ECM and ignitor.
Connector & terminal
(B84) No. 41 — (B13) No. 1:

H2M2287A

: Is the voltage more than 10 V?

: Go to step 8D12.
: Replace ignitor. H2M2288A

: Is the resistance less than 1 Ω?

: Go to step 8D14.
: Repair open circuit in harness between
ECM and ignitor connector.

101
2-7 [T8D14] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8D14 : CHECK HARNESS BETWEEN ECM 8D16 : CHECK GROUND CIRCUIT OF ECM.
AND IGNITOR CONNECTOR.
Measure resistance of harness connector between
Measure resistance of harness between ECM and ECM and chassis ground.
ignitor connector. Connector & terminal
Connector & terminal (B84) No. 41 — Chassis ground:
(B84) No. 40 — (B13) No. 2:

H2M2291A
H2M2289A
: Is the resistance more than 1 MΩ?
: Is the resistance less than 1 Ω? : Go to step 8D17.
: Go to step 8D15. : Repair ground short circuit in harness
: Repair open circuit in harness between between ECM and ignitor connector.
ECM and ignitor connector.
8D17 : CHECK GROUND CIRCUIT OF ECM.
8D15 : CHECK HARNESS BETWEEN ECM
AND IGNITOR CONNECTOR. Measure resistance of harness between ECM and
chassis ground.
Measure resistance of harness between ECM and
Connector & terminal
ignitor connector.
(B84) No. 40 — Chassis ground:
Connector & terminal
(B84) No. 94 — (B13) No. 3:

H2M2292A

H2M2290A : Is the resistance more than 1 MΩ?

: Go to step 8D18.
: Is the resistance less than 1 Ω?
: Repair ground short circuit in harness
: Repair open circuit in harness between between ECM and ignitor connector.
ECM and ignitor connector.
: Go to step 8D16.

102
 ON-BORAD DIAGNOSTICS II SYSTEM [T8D18] 2-7
8. Diagnostics for Engine Starting Failure

8D18 : CHECK POOR CONTACT.

Check poor contact in ECM connector. <Ref. to

FOREWORD [T3C1].>
: Is there poor contact in ECM connec-
tor?
: Repair poor contact in ECM connector.
: Check fuel pump circuit. <Ref. to 2-7
[T8E0].> <Ref. to 2-7 [T8F0].>

103
2-7 [T8E0] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

E: FUEL PUMP CIRCUIT (2200 cc FWD AND TAIWAN SPEC. VEHICLES)

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:

B2M1818

8E1 : CHECK OPERATING SOUND OF 8E2 : CHECK GROUND CIRCUIT OF FUEL

FUEL PUMP. PUMP.

Make sure that fuel pump is in operation for two 1) Turn ignition switch to OFF.
seconds when turning ignition switch to ON. 2) Remove fuel pump access hole lid located on
NOTE: the right rear of trunk compartment floor (Sedan) or
Fuel pump operation check can also be executed luggage compartment floor (Wagon).
using Subaru Select Monitor (Function mode:
FD01).
For the procedure, refer to “COMPULSORY
VALVE OPERATION CHECK MODE”. <Ref. to 2-7
[T3F0].>
: Does fuel pump produce operating
sound?
: Check fuel injector circuit. <Ref. to 2-7
[T8G0].>
: Go to step 8E2. G2M0340

3) Disconnect connector from fuel pump.

104
 ON-BORAD DIAGNOSTICS II SYSTEM [T8E4] 2-7
8. Diagnostics for Engine Starting Failure

4) Measure resistance of harness connector 8E4 : CHECK HARNESS BETWEEN FUEL

between fuel pump and chassis ground. PUMP AND FUEL PUMP RELAY CON-
Connector & terminal NECTOR.
(R58) No. 4 — Chassis ground:
1) Turn ignition switch to OFF.
2) Measure resistance of harness connector
between fuel pump and fuel pump relay.
Connector & terminal
(R58) No. 1 — (B46) No. 4:

OBD0132A

: Is the resistance less than 5 Ω?

: Go to step 8E3.
: Repair harness and connector.
NOTE: H2M2303A

In this case, repair the following:

I Open circuit in harness between fuel pump con- : Is the resistance less than 1 Ω?
nector and chassis grounding terminal : Go to step 8E5.
I Poor contact in coupling connector (R15) : Repair harness and connector.
8E3 : CHECK POWER SUPPLY TO FUEL NOTE:
PUMP. In this case, repair the following:
I Open circuit in harness between fuel pump con-
nector and chassis grounding terminal
1) Turn ignition switch to ON. I Poor contact in coupling connectors (R15 and
2) Measure voltage of power supply circuit B97)
between fuel pump connector and chassis ground.
Connector & terminal
(R58) No. 1 (+) — Chassis ground (−):

OBD0133A

: Is the voltage more than 10 V?

: Replace fuel pump.
: Go to step 8E4.

105
2-7 [T8E5] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8E5 : CHECK HARNESS BETWEEN FUEL 8E7 : CHECK HARNESS BETWEEN ECM
PUMP AND FUEL PUMP RELAY CON- AND FUEL PUMP RELAY CONNEC-
NECTOR. TOR.

Measure resistance of harness between fuel pump 1) Disconnect connectors from ECM.
and fuel pump relay connector. 2) Measure resistance of harness between ECM
and fuel pump relay connector.
Connector & terminal
(R58) No. 1 — Chassis ground: Connector & terminal
(B84) No. 32 — (B46) No. 3:

H2M2304A
B2M0527A

: Is the resistance more than 1 MΩ?

: Is the resistance less than 1 Ω?
: Go to step 8E6.
: Go to step 8E8.
: Repair short circuit in harness between
: Repair open circuit in harness between
fuel pump and fuel pump relay connec-
ECM and fuel pump relay connector.
tor.

8E8 : CHECK POOR CONTACT.

8E6 : CHECK FUEL PUMP RELAY.
Check poor contact in ECM connector. <Ref. to
1) Disconnect connectors from fuel pump relay FOREWORD [T3C1].>
and main relay.
2) Remove fuel pump relay and main relay with : Is there poor contact in ECM connec-
bracket. tor?
3) Connect battery to fuel pump relay connector : Repair poor contact in ECM connector.
terminals No. 1 and No. 3. : Check fuel injector circuit. <Ref. to 2-7
4) Measure resistance between connector termi- [T8G0].>
nals of fuel pump relay.
Terminals
No. 2 — No. 4:

G2M0461

: Is the resistance less than 10 Ω?

: Go to step 8E7.
: Replace fuel pump relay.

106
 ON-BORAD DIAGNOSTICS II SYSTEM [T8E8] 2-7
8. Diagnostics for Engine Starting Failure

MEMO:

107
2-7 [T8F0] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

F: FUEL PUMP CIRCUIT (EXCEPT 2200 cc FWD AND TAIWAN SPEC.

VEHICLES)
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
I WIRING DIAGRAM:

B2M1819

8F1 : CHECK OPERATING SOUND OF 8F2 : CHECK GROUND CIRCUIT OF FUEL

FUEL PUMP. PUMP.

Make sure that fuel pump is in operation for two 1) Turn ignition switch to OFF.
seconds when turning ignition switch to ON. 2) Remove fuel pump access hole lid located on
NOTE: the right rear of trunk compartment floor (Sedan) or
Fuel pump operation check can also be executed luggage compartment floor (Wagon).
using Subaru Select Monitor (Function mode:
FD01).
For the procedure, refer to “COMPULSORY
VALVE OPERATION CHECK MODE”. <Ref. to 2-7
[T3F0].>
: Does fuel pump produce operating
sound?
: Check fuel injector circuit. <Ref. to 2-7
[T8G0].>
: Go to step 8F2. G2M0340

3) Disconnect connector from fuel pump.

108
 ON-BORAD DIAGNOSTICS II SYSTEM [T8F4] 2-7
8. Diagnostics for Engine Starting Failure

4) Measure resistance of harness connector 8F4 : CHECK HARNESS BETWEEN FUEL

between fuel pump and chassis ground. PUMP AND FUEL PUMP RELAY CON-
Connector & terminal NECTOR.
(R58) No. 4 — Chassis ground:
1) Turn ignition switch to OFF.
2) Measure resistance of harness connector
between fuel pump and fuel pump relay.
Connector & terminal
(R58) No. 1 — (B46) No. 4:

OBD0132A

: Is the resistance less than 5 Ω?

: Go to step 8F3.
: Repair harness and connector.
NOTE: H2M2303A

In this case, repair the following:

I Open circuit in harness between fuel pump con- : Is the resistance less than 1 Ω?
nector and chassis grounding terminal : Go to step 8F5.
I Poor contact in coupling connector (R67) : Repair harness and connector.
8F3 : CHECK POWER SUPPLY TO FUEL NOTE:
PUMP. In this case, repair the following:
I Open circuit in harness between fuel pump con-
nector and chassis grounding terminal
1) Turn ignition switch to ON. I Poor contact in coupling connectors (R67 and
2) Measure voltage of power supply circuit B97)
between fuel pump connector and chassis ground.
Connector & terminal
(R58) No. 1 (+) — Chassis ground (−):

OBD0133A

: Is the voltage more than 10 V?

: Replace fuel pump.
: Go to step 8F4.

109
2-7 [T8F5] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

8F5 : CHECK HARNESS BETWEEN FUEL 8F7 : CHECK HARNESS BETWEEN ECM
PUMP AND FUEL PUMP RELAY CON- AND FUEL PUMP RELAY CONNEC-
NECTOR. TOR.

Measure resistance of harness between fuel pump 1) Disconnect connectors from ECM.
and fuel pump relay connector. 2) Measure resistance of harness between ECM
Connector & terminal and fuel pump relay connector.
(R58) No. 1 — Chassis ground: Connector & terminal
(B84) No. 32 — (B46) No. 3:

H2M2304A

B2M0527A
: Is the resistance more than 1 MΩ?
: Go to step 8F6. : Is the resistance less than 1 Ω?
: Repair short circuit in harness between : Go to step 8F8.
fuel pump and fuel pump relay connec-
: Repair open circuit in harness between
tor.
ECM and fuel pump relay connector.

8F6 : CHECK FUEL PUMP RELAY.

8F8 : CHECK POOR CONTACT.
1) Disconnect connectors from fuel pump relay
and main relay. Check poor contact in ECM connector.
2) Remove fuel pump relay and main relay with <Ref. to FOREWORD [T3C1].>
bracket. : Is there poor contact in ECM connec-
3) Connect battery to fuel pump relay connector tor?
terminals No. 1 and No. 3. : Repair poor contact in ECM connector.
4) Measure resistance between connector termi-
nals of fuel pump relay. : Check fuel injector circuit. <Ref. to 2-7
[T8G0].>
Terminals
No. 2 — No. 4:

G2M0461

: Is the resistance less than 10 Ω?

: Go to step 8F7.
: Replace fuel pump relay.

110
 ON-BORAD DIAGNOSTICS II SYSTEM [T8G0] 2-7
8. Diagnostics for Engine Starting Failure

G: FUEL INJECTOR CIRCUIT

CAUTION:
I Check or repair only faulty parts.
I After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
NOTE:
Check fuel injector circuit. <Ref. to 2-7 [T10AA0].> or <Ref. to 2-7 [T10AE0].> (LHD), <Ref. to 2-7
[T11AA0].> or <Ref. to 2-7 [T11AE0].> (RHD)
I WIRING DIAGRAM:

B2M1820

111
2-7 [T8H0] ON-BORAD DIAGNOSTICS II SYSTEM
8. Diagnostics for Engine Starting Failure

H: CRANKSHAFT POSITION SENSOR CIRCUIT

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
NOTE:
Check crankshaft position sensor circuit. <Ref. to 2-7 [T10AK0].> (LHD), <Ref. to 2-7 [T11AK0].> (RHD)
I WIRING DIAGRAM:

B2M1294

112
 ON-BORAD DIAGNOSTICS II SYSTEM [T8I0] 2-7
8. Diagnostics for Engine Starting Failure

I: CAMSHAFT POSITION SENSOR CIRCUIT

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0].> and <Ref. to 2-7 [T3E0].>
NOTE:
Check camshaft position sensor circuit. <Ref. to 2-7 [T10AM0].> (LHD), <Ref. to 2-7 [T11AM0].> (RHD)
I WIRING DIAGRAM:

B2M1055

113