Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 246

CHECK CRANKSHAFT POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the crankshaft position sensor.
3) Measure the resistance between terminals
of crankshaft position sensor.

Terminals

No. 1 — No. 2:

Is the resistance between 1 and
4 kΩ?

Go to step

Replace the crank-
shaft position sen-
sor. <Ref. to
FU(STI)-35,
Crankshaft Posi-
tion Sensor.> <Ref.
to FU(w/o STI)-35,
Crankshaft Posi-
tion Sensor.>

CHECK HARNESS BETWEEN ECM AND
CRANKSHAFT POSITION SENSOR CON-
NECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness between
ECM connector and crankshaft position sensor
connector.

Connector & terminal

(B137) No. 17 — (E10) No. 1:
(B137) No. 25 — (E10) No. 2:

Is the resistance less than 1 Ω? Repair the poor

contact of ECM
and crankshaft
position sensor
connector.

Repair the harness
and connector.
NOTE:

In this case, repair
the following item:
• Open circuit in
harness between
ECM

connector

and crankshaft po-
sition sensor con-
nector
• Poor contact of
coupling connector

EN(H4DOTC)(diag)-210

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

BM:DTC P0336 CRANKSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PER-

FORMANCE

DTC DETECTING CONDITION:

• Detected when two consecutive driving cycles with fault occur.

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-130, DTC P0336 CRANKSHAFT POSITION SENSOR

“A” CIRCUIT RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>

TROUBLE SYMPTOM:

• Engine stalls.

• Failure of engine to start
CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,

OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-

DURE, Inspection Mode.>.

Step

Check

Yes

CHECK CONDITION OF CRANKSHAFT PO-
SITION SENSOR.
Turn the ignition switch to OFF.

Is the crankshaft position sen-
sor installation bolt tightened
securely?

Go to step

Tighten the crank-
shaft position sen-
sor installation bolt
securely. <Ref. to
FU(STI)-35,
Crankshaft Posi-
tion Sensor.> <Ref.
to FU(w/o STI)-35,
Crankshaft Posi-
tion Sensor.>

CHECK CRANK SPROCKET.
Remove the timing belt cover.

Are crank sprocket teeth
cracked or damaged?

Replace the crank
sprocket. <Ref. to
ME(STI)-60, Crank
Sprocket.> <Ref. to
ME(w/o STI)-58,
Crank Sprocket.>

Go to step

CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cylin-
der block.
ST 499987500

CRANKSHAFT
SOCKET

Is the timing belt dislocated
from its proper position?

Repair the installa-
tion condition of
timing belt. <Ref.
to ME(STI)-50,
Timing Belt.> <Ref.
to ME(w/o STI)-48,
Timing Belt.>

Replace the crank-
shaft position sen-
sor. <Ref. to
FU(STI)-35,
Crankshaft Posi-
tion Sensor.> <Ref.
to FU(w/o STI)-35,
Crankshaft Posi-
tion Sensor.>