Subaru Impreza 2004 Service Manual page 161

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK DTC P0705 ON DISPLAY.
2 CHECK INPUT SIGNAL FOR ECM.
1)Turn the ignition switch to ON.
2)Place the select lever except for "N" and "P"
positions.
3)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 8 (+) — Chassis ground ( − − − − ):
3 CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from ECM and
transmission harness connector (T3).
3)Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B134) No. 8 — Chassis ground:
4 CHECK TRANSMISSION HARNESS CON-
NECTOR.
1)Disconnect the connector from inhibitor
switch.
2)Measure the resistance of harness between
transmission harness connector and engine
ground.
Connector & terminal
(T3) No. 12 — Engine ground:
5 CHECK INHIBITOR SWITCH.
Measure the resistance between inhibitor
switch connector the receptacle's terminals in
selector lever except for "N" position.
Terminals
No. 7 — No. 12:
6 CHECK SELECTOR CABLE CONNECTION. Is there any fault in selector
Check
Is DTC P0705 indicated?
Is the voltage 4.5 — 5.5 V?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
cable connection to inhibitor
switch?
EN(H4DOTC)(diag)-240
Yes
Inspect DTC Go to step 2.
P0705 using "List
of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4DOTC)(dia
g)-74, List of Diag-
nostic Trouble
Code (DTC).>
Even if malfunction Go to step 3.
indicator light
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time.
Go to step 4. Repair ground
short circuit in har-
ness between
ECM and trans-
mission harness
connector.
Go to step 5. Repair ground
short circuit in har-
ness between
transmission har-
ness and inhibitor
switch connector.
Go to step 6. Replace the inhibi-
tor switch. <Ref. to
4AT-52, Inhibitor
Switch.>
Repair selector Contact your Sub-
cable connection. aru distributor ser-
<Ref. to CS-14, vice.
INSPECTION,
NOTE:
Select Cable.>
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
No
be-
probable
multiple