Subaru Forester 2004 Service Manual page 137

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTIC)
Step
1 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 — Engine ground:
2 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:
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. 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 the resistance more than
100 kΩ?
Is the resistance more than 1
MΩ?
Is the resistance less than 5 Ω? Go to step 4.
Is the crankshaft position sen-
sor installation bolt tightened
securely?
Is the resistance 1 — 4 kΩ?
EN(H4DOTC 2.5)-136
Yes
Repair the harness Go to step 2.
and connector.
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 3. Repair ground short
circuit in harness
between crankshaft
position sensor and
ECM connector.
NOTE:
The harness be-
tween both con-
nectors are
shielded. Repair
ground short circuit
in harness togeth-
er with shield.
Repair the harness
and connector.
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 5. Tighten the crank-
shaft position sen-
sor installation bolt
securely.
Repair poor con- Replace the crank-
tact in crankshaft shaft position sen-
position sensor sor. <Ref. to
connector. FU(H4DOTC 2.5)-
27, Crankshaft
Position Sensor.>
No