Subaru 2004 LEGACY Service Manual page 127

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK POWER SUPPLY OF CAMSHAFT
POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from camshaft
position sensor.
3) Measure the voltage between camshaft
position sensor connector and engine ground.
Connector & terminal
(E73) No. 1 (+) — Engine ground (
3 CHECK POWER SUPPLY OF CAMSHAFT
POSITION SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between camshaft
position sensor connector and engine ground.
Connector & terminal
(E73) No. 1 (+) — Engine ground (
4 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR CONNECTOR AND
ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between camshaft
position sensor connector and ECM.
Connector & terminal
(E73) No. 2 — (B135) No. 9:
(E73) No. 3 — (B136) No. 35:
5 CHECK HARNESS BETWEEN CAMSHAFT
POSITION SENSOR CONNECTOR AND
ECM.
Measure the resistance between camshaft
position sensor connector and engine ground.
Connector & terminal
(E73) No. 2 — Engine ground:
6 CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
7 CHECK CAMSHAFT POSITION SENSOR.
Check waveform of camshaft position sensor.
<Ref. to EN(H6DO)(diag)-17, Engine Control
Module (ECM) I/O Signal.>
8 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Check
Is any other DTC displayed?
Is the voltage more than 10 V? Repair the battery
−
):
Is the voltage more than 10 V? Go to step 4.
−
):
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the camshaft position sensor
installation bolt tightened
securely?
Is there any abnormality in
waveform?
Is the poor contact in ECM
connector?
EN(H6DO)(diag)-196
Yes
Inspect the DTC Go to step 2.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 3.
short circuit
between main
relay connector
and camshaft
position sensor
connector.
Repair open or
battery short cir-
cuit between main
relay connector
and camshaft
position sensor
connector.
Go to step 5. Repair the open
circuit between
camshaft position
sensor and ECM.
Go to step 6. Repair the ground
short circuit
between camshaft
position sensor
and ECM.
Go to step 7. Tighten the cam-
shaft position sen-
sor installation bolt
securely.
Replace the cam- Go to step 8.
shaft position sen-
sor. <Ref. to
FU(H6DO)-19,
Crankshaft Posi-
tion Sensor.>
Repair the poor Replace the ECM.
contact in ECM <Ref. to
connector. FU(H6DO)-34,
Engine Control
Module (ECM).>
No