Subaru Legacy (2005 year). Service manual — part 118

EN(H4SO 2.0)(diag)-61

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

7

CHECK HARNESS BETWEEN ECM AND
FUEL PUMP RELAY CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and fuel pump relay connector.

Connector & terminal

RHD model and LHD model (with immo-
bilizer)

(B135) No. 17 — (B362) No. 3:

LHD model (without immobilizer)

(B134) No. 18 — (B362) No. 3:

Is the resistance less than 1
Ω?

Go to step 8.

Repair the open
circuit of harness
between ECM and
fuel pump relay
connector.

8

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM
connector?

Repair the poor
contact in ECM
connector.

Check the fuel
injector circuit.
<Ref. to EN(H4SO
2.0)(diag)-62,
FUEL INJECTOR
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>

Step

Check

Yes

No

EN(H4SO 2.0)(diag)-62

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

F: FUEL INJECTOR CIRCUIT

CAUTION:
• Check or repair only faulty parts.
• After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(di-
ag)-38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32,
PROCEDURE, Inspection Mode.>.
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK OPERATION OF EACH FUEL INJEC-
TOR.
While cranking the engine, check each fuel
injector emits operating sound. Use a sound
scope or attach a screwdriver to the injector for
this check.

Does the fuel pump emit oper-
ating sound?

Check the fuel
pressure. <Ref. to
ME(H4SO 2.0)-27,
INSPECTION,
Fuel Pressure.>

Go to step 2.

EN-03474

E6

E17

E5

E16

1 2

1

2

1

2

1

2

1

2

34

27

17

33

42

48

43

44

45

ECM

B134

E5

E16

E6

E17

B21

E2

FUEL INJECTOR

No. 1

FUEL INJECTOR

No. 2

FUEL INJECTOR

No. 3

FUEL INJECTOR

No. 4

BATTERY

SBF-7

B47

MAIN RELAY

1

2

4

6

3

5

B47

3

4

1

2

5

6

E

B21

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

5

6

7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 34

29

32

30 31

EN(H4SO 2.0)(diag)-63

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

2

CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
fuel injector terminal and engine ground.

Connector & terminal

#1 (E5) No. 2 (+) — Engine ground (

−

):

#2 (E16) No. 2 (+) — Engine ground (

−

):

#3 (E6) No. 2 (+) — Engine ground (

−

):

#4 (E17) No. 2 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Go to step 3.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
main relay and fuel
injector connector
• Poor contact in
main relay connec-
tor
• Poor contact in
coupling connector
• Poor contact in
fuel injector con-
nector

3

CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and fuel injector connector.

Connector & terminal

#1 (B134) No. 17 — (E5) No. 1:
#2 (B134) No. 27 — (E16) No. 1:
#3 (B134) No. 34 — (E6) No. 1:
#4 (B134) No. 33 — (E17) No. 1:

Is the resistance less than 1
Ω?

Go to step 4.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector

4

CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.

Connector & terminal

#1 (B134) No. 17 — Chassis ground:
#2 (B134) No. 27 — Chassis ground:
#3 (B134) No. 34 — Chassis ground:
#4 (B134) No. 33 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 5.

Repair the ground
short circuit of har-
ness between
ECM and fuel
injector connector.

5

CHECK EACH FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between each fuel
injector terminals.

Terminals

No. 1 — No. 2:

Is the resistance 5 — 20

Ω?

Go to step 6.

Replace the faulty
fuel injector.

6

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM
connector?

Repair the poor
contact in ECM
connector.

Inspection using
“General Diagnos-
tic Table”. <Ref. to
EN(H4SO
2.0)(diag)-224,
INSPECTION,
General Diagnos-
tic Table.>

Step

Check

Yes

No

EN(H4SO 2.0)(diag)-64

ENGINE (DIAGNOSTICS)

List of Diagnostic Trouble Code (DTC)

17.List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Item

NOTE

P0030

HO2S Heater Control Circuit (Bank 1
Sensor 1)

<Ref. to EN(H4SO 2.0)(diag)-69, DTC P0030 HO2S HEATER CONTROL
CIRCUIT (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>

P0031

HO2S Heater Control Circuit Low
(Bank 1 Sensor 1)

<Ref. to EN(H4SO 2.0)(diag)-71, DTC P0031 HO2S HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0032

HO2S Heater Control Circuit High
(Bank 1 Sensor 1)

<Ref. to EN(H4SO 2.0)(diag)-74, DTC P0032 HO2S HEATER CONTROL
CIRCUIT HIGH (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0037

HO2S Heater Control Circuit Low
(Bank 1 Sensor 2)

<Ref. to EN(H4SO 2.0)(diag)-76, DTC P0037 HO2S HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0038

HO2S Heater Control Circuit High
(Bank 1 Sensor 2)

<Ref. to EN(H4SO 2.0)(diag)-79, DTC P0038 HO2S HEATER CONTROL
CIRCUIT HIGH (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0107

Manifold Absolute Pressure/Baro-
metric Pressure Circuit Low Input

<Ref. to EN(H4SO 2.0)(diag)-81, DTC P0107 MANIFOLD ABSOLUTE
PRESSURE/BAROMETRIC PRESSURE CIRCUIT LOW INPUT, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

P0108

Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input

<Ref. to EN(H4SO 2.0)(diag)-84, DTC P0108 MANIFOLD ABSOLUTE
PRESSURE/BAROMETRIC PRESSURE CIRCUIT HIGH INPUT, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

P0112

Intake Air Temperature Sensor 1 Cir-
cuit Low

<Ref. to EN(H4SO 2.0)(diag)-87, DTC P0112 INTAKE AIR TEMPERATURE
SENSOR 1 CIRCUIT LOW, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

P0113

Intake Air Temperature Sensor 1 Cir-
cuit High

<Ref. to EN(H4SO 2.0)(diag)-89, DTC P0113 INTAKE AIR TEMPERATURE
SENSOR 1 CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

P0117

Engine Coolant Temperature Circuit
Low

<Ref. to EN(H4SO 2.0)(diag)-92, DTC P0117 ENGINE COOLANT TEM-
PERATURE CIRCUIT LOW, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

P0118

Engine Coolant Temperature Circuit
High

<Ref. to EN(H4SO 2.0)(diag)-94, DTC P0118 ENGINE COOLANT TEM-
PERATURE CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

P0122

Throttle/Pedal Position Sensor/
Switch “A” Circuit Low

<Ref. to EN(H4SO 2.0)(diag)-96, DTC P0122 THROTTLE/PEDAL POSI-
TION SENSOR/SWITCH “A” CIRCUIT LOW, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>

P0123

Throttle/Pedal Position Sensor/
Switch “A” Circuit High

<Ref. to EN(H4SO 2.0)(diag)-99, DTC P0123 THROTTLE/PEDAL POSI-
TION SENSOR/SWITCH “A” CIRCUIT HIGH, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>

P0125

Insufficient Coolant Temperature for
Closed Loop Fuel Control

<Ref. to EN(H4SO 2.0)(diag)-102, DTC P0125 INSUFFICIENT COOLANT
TEMPERATURE FOR CLOSED LOOP FUEL CONTROL, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

P0130

O2 Sensor Circuit (Bank1 Sensor1)

<Ref. to EN(H4SO 2.0)(diag)-104, DTC P0130 O2 SENSOR CIRCUIT
(BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>

P0131

O2 Sensor Circuit Low Voltage (Bank
1 Sensor 1)

<Ref. to EN(H4SO 2.0)(diag)-107, DTC P0131 O2 SENSOR CIRCUIT LOW
VOLTAGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>

P0132

O2 Sensor Circuit High Voltage
(Bank 1 Sensor 1)

<Ref. to EN(H4SO 2.0)(diag)-109, DTC P0132 O2 SENSOR CIRCUIT HIGH
VOLTAGE (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>

P0133

O2 Sensor Circuit Slow Response
(Bank 1 Sensor 1)

<Ref. to EN(H4SO 2.0)(diag)-111, DTC P0133 O2 SENSOR CIRCUIT
SLOW RESPONSE (BANK 1 SENSOR 1), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>