Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 31

FU(STI)-36

Crankshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

6) Connect the probe to ECM connector.

7) Start the engine and let it idle.

8) Check the pattern is the same as the waveform

and voltage shown below.

9) After  inspection,  install  the  related  parts  in  the

reverse order of removal.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

3. OTHER INSPECTIONS

Check that the crankshaft position sensor has no

deformation, cracks or other damages.

(A) To ECM connector

Terminal No.

Probe

17

+

25

–

(A) One crankshaft rotation

5

6

7

8

2

1

9

4

3

10

22

23

11

12

13

14

15

24

25

26

16

17

18

19

20

21

27

28

29

30

31

FU-04758

(A)

FU-04057

5V

0

10ms

(A)

FU(STI)-37

Camshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

6. Camshaft Position Sensor

A: REMOVAL

1. INTAKE SIDE

• Camshaft position sensor RH
1) Disconnect the ground cable from battery.

2) Disconnect the connector (A) from the camshaft

position sensor RH, and remove the camshaft po-

sition sensor RH from the rear side of the cylinder

head.

• Camshaft position sensor LH
1) Disconnect the ground cable from battery.

2) Remove the intake manifold. <Ref. to FU(STI)-

17, REMOVAL, Intake Manifold.>

3) Remove the camshaft position sensor LH.

2. EXHAUST SIDE

1) Disconnect the ground cable from battery.

2) Lift up the vehicle.

3) Remove  the  under  cover.  <Ref.  to  EI-28,  RE-

MOVAL, Front Under Cover.>

4) Remove  the  engine  harness  cover.  (right  side

only.)

IN-00203

FU-05840

(A)

IN-00203

FU-05841

IN-00203

FU-03616

FU(STI)-38

Camshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

5) Disconnect connector (A) from the camshaft po-

sition  sensor,  and  remove  the  camshaft  position

sensor from under the cylinder head.

• RH side

• LH side

B: INSTALLATION

1. INTAKE SIDE

Install in the reverse order of removal.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

2. EXHAUST SIDE

Install in the reverse order of removal.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

• RH side

• LH side

Tightening torque:

5 N·m (0.5 kgf-m, 3.7 ft-lb)

FU-05801

(A)

FU-05826

(A)

FU-05793

FU-05827

FU-03616

FU(STI)-39

Camshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

C: INSPECTION

1. CAMSHAFT POSITION SENSOR (METH-

OD WITH OSCILLOSCOPE)

1) Prepare an oscilloscope.

2) Remove  the  lower  inner  trim  of  passenger’s

side.  <Ref.  to  EI-57,  REMOVAL,  Lower  Inner

Trim.>

3) Turn over the floor mat of passenger’s seat.

4) Remove the protect cover.

5) Remove the nuts and bolts which hold the ECM

to the bracket.

6) Connect the probe to ECM connector.

• Intake camshaft position sensor

• Exhaust camshaft position sensor

7) Start the engine and let it idle.

8) Check the pattern is the same as the waveform

and voltage shown below.

9) After  inspection,  install  the  related  parts  in  the

reverse order of removal.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

2. OTHER INSPECTIONS

Check that the camshaft position sensor has no de-

formation, cracks or other damages.

(A) To ECM connector

FU-03416

FU-03417

5

6

7

8

2

1

9

4

3

10

22

23

11

12

13

14

15

24

25

26

16

17

18

19

20

21

27

28

29

30

31

(A)

FU-04757

(A) To ECM connector

Camshaft position 

sensor

Terminal No.

Probe

Intake

RH

24

+

LH

16

+

Exhaust

RH

23

+

LH

29

+

RH and LH

30

–

(A) One camshaft rotation
(B) Intake camshaft position sensor RH

(C) Intake camshaft position sensor LH
(D) Exhaust camshaft position sensor RH

(E) Exhaust camshaft position sensor LH

5

6

7

8

2

1

9

4

3

10

22

23

11

12

13

14

15

24

25

26

16

17

18

19

20

21

27

28

29

30

31

(A)

FU-04762

FU-04763

0

0

0

0

(A)

10ms

5V

(B)

(C)

(D)

(E)