Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 127

FU(w/o STI)-35

Crankshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

5. Crankshaft Position Sensor

A: REMOVAL

1) Remove the collector cover.

2) Disconnect the ground cable from battery.

3) Remove the bolt which secures crankshaft posi-

tion sensor to oil pump.

4) Remove the crankshaft position sensor, and dis-

connect the connector from the crankshaft position

sensor.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

C: INSPECTION

1. CRANKSHAFT POSITION SENSOR 

(METHOD WITH CIRCUIT TESTER)

Measure the resistance between crankshaft posi-

tion sensor terminals.

2. CRANKSHAFT POSITION SENSOR 

(METHOD 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.

IN-00203

FU-05818

FU-05348

Terminal No.

Standard

1 and 2

2.04±0.204 kΩ

2 1

EC-02428

FU-03416

FU-03417

FU(w/o 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(w/o STI)-37

Camshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

6. Camshaft Position Sensor

A: REMOVAL

1. 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.

2. CAMSHAFT POSITION SENSOR LH

1) Remove the collector cover.

2) Disconnect the ground cable from battery.

3) Remove  the  intake  manifold.  <Ref.  to  FU(w/o

STI)-18, REMOVAL, Intake Manifold.>

4) Remove the camshaft position sensor LH.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

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.

IN-00203

FU-05835

(A)

IN-00203

FU-05841

FU-03416

FU-03417

FU(w/o STI)-38

Camshaft 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)

2. OTHER INSPECTIONS

Check that the camshaft position sensor has no de-

formation, cracks or other damages.

(A) To ECM connector

Camshaft position 

sensor

Terminal No.

Probe

RH

24

+

LH

16

+

RH and LH

30

–

(A) One camshaft 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

(A)

FU-04757

FU-04060

LH

5V

50ms

0

RH

0

(A)

(A)