Subaru Legacy 2002 Service Manual page 1424

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK POWER SUPPLY TO CAMSHAFT
POSITION SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from camshaft posi-
tion sensor.
3) Measure voltage between camshaft posi-
tion sensor and engine ground.
Connector & terminal
(E15) No. 1 (+) — Engine ground (−):
2 CHECK POWER SUPPLY TO CAMSHAFT
POSITION SENSOR.
1) Turn ignition switch to ON.
2) Measure voltage between camshaft posi-
tion sensor and engine ground.
Connector & terminal
(E15) No. 1 (+) — Engine ground (−):
3 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance between camshaft
position sensor and ECM.
Connector & terminal
(E15) No. 2 — (B135) No. 1:
(E15) No. 3 — (B135) No. 10:
4 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR AND ECM.
Measure resistance between camshaft posi-
tion sensor and engine ground.
Connector & terminal
(E15) No. 2 — Engine ground:
(E15) No. 3 — Engine ground:
5 CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
6 CHECK CAMSHAFT POSITION SENSOR.
Check camshaft position sensor wave form.
<Ref. to EN(H6)-30, WAVEFORM,
MEASUREMENT, Engine Control Module
(ECM) I/O Signal.>
7 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Is the voltage more than
10V ?
Is the voltage more than
10V ?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the camshaft position
sensor installation bolt
tightened securely?
Is any abnormality found in
waveform?
Is there poor contact in
ECM connector?
EN(H6)-217
Check Yes
Repair ground
short circuit
between main
relay connector
and camshaft
position sensor
connector.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Repair poor con-
tact in ECM con-
nector.
Engine (DIAGNOSTICS)
No
Go to step 2.
Repair open or
ground short cir-
cuit between main
relay connector
and camshaft
position sensor
connector.
Repair open cir-
cuit between cam-
shaft position sen-
sor and ECM.
Repair ground
short circuit
between camshaft
position sensor
and ECM.
Tighten camshaft
position sensor
installation bolt.
Replace camshaft
position sensor.
<Ref. to FU(H6)-
31, Camshaft
Position Sensor.>
Replace ECM.
<Ref. to FU(H6)-
47, Engine Con-
trol Module.>