Subaru IMPREZA GD 2007 Series Manual page 1506

asieps_tobira_IM_US.book 175 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK POWER SUPPLY OF CAMSHAFT
POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the cam-
shaft position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between camshaft
position sensor connector and engine ground.
Connector & terminal
(E36) No. 1 (+) — Engine ground (–):
2 CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between the ECM
and camshaft position sensor connector.
Connector & terminal
(B134) No. 11 — (E36) No. 2:
(B134) No. 22 — (E36) No. 3:
3 CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
Measure the resistance between camshaft
position sensor connector and engine ground.
Connector & terminal
(E36) No. 2 — Engine ground:
4 CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
Measure the voltage between camshaft posi-
tion sensor connector and engine ground.
Connector & terminal
(E36) No. 2 (+) — Engine ground (–):
5 CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
6 CHECK CAMSHAFT POSITION SENSOR.
Check the waveform of the camshaft position
sensor. <Ref. to EN(STI)(diag)-18, Engine Con-
trol Module (ECM) I/O Signal.>
Check
Is the voltage 10 V or more?
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance 1 MΩ or more? Go to step 4.
Is the voltage 5 V or more?
Is the camshaft position sensor
installation bolt tightened
securely?
Is there any abnormality in
waveform?
EN(STI)(diag)-175
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Repair the open or
ground short circuit
of harness
between main
relay connector
and camshaft posi-
tion sensor con-
nector.
Repair the open
circuit of harness
between the ECM
and camshaft posi-
tion sensor.
Repair the short
circuit to ground of
harness between
the ECM and cam-
shaft position sen-
sor.
Repair the short Go to step 5.
circuit to power in
the harness
between the ECM
and camshaft posi-
tion sensor.
Go to step 6. Tighten the cam-
shaft position sen-
sor installation bolt
securely.
Replace the cam- Repair the follow-
shaft position sen- ing item.
sor. <Ref. to • Poor contact in
FU(H4DOTC)-32, ECM connector
Camshaft Position • Poor contact in
Sensor.> camshaft position
sensor
• Poor contact of
coupling connector