Subaru Legacy 2004 Service Manual page 1416

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK HARNESS BETWEEN CRANK-
SHAFT POSITION SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the crank-
shaft position sensor.
3) Measure the resistance of harness
between crankshaft position sensor connector
and engine ground.
Connector & terminal
(E10) No. 1 — (B135) No. 10:
(E10) No. 2 — (B135) No. 22:
3 CHECK HARNESS BETWEEN CRANK-
SHAFT POSITION SENSOR AND ECM CON-
NECTOR.
Measure the resistance of harness between
crankshaft position sensor connector and
engine ground.
Connector & terminal
(E10) No. 1 — Engine ground:
(E10) No. 2 — Engine ground:
4 CHECK CONDITION OF CRANKSHAFT PO-
SITION SENSOR.
5 CHECK CRANKSHAFT POSITION SENSOR.
1) Remove the crankshaft position sensor.
2) Measure the resistance between connector
terminals of crankshaft position sensor.
Terminals
No. 1 — No. 2:
Check
Is any other DTC displayed?
Is the resistance more than
100 k'?
Is the resistance more than 1
M'?
Is the crankshaft position sen-
sor installation bolt tightened
securely?
Is the resistance 1 — 4 k'?
EN(H4DOTC)(diag)-127
ENGINE (DIAGNOSTICS)
Yes
Inspect the DTC Go to step 2.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H4DOTC)(diag
)-55, List of Diag-
nostic Trouble
Code (DTC).>
Repair the har- Go to step 3.
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
crankshaft posi-
tion sensor and
ECM connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
Go to step 4. Repair the ground
short circuit in har-
ness between
crankshaft posi-
tion sensor and
ECM connector.
NOTE:
The harness be-
tween both con-
nectors
shielded.
the ground short
circuit in harness
together
shield.
Go to step 5. Tighten the crank-
shaft position sen-
sor installation bolt
securely.
Repair the poor Replace the crank-
contact in crank- shaft position sen-
shaft position sen- sor. <Ref. to
sor connector. FU(H4DOTC)-24,
Crankshaft Posi-
tion Sensor.>
No
are
Repair
with