Subaru Legacy 2005 Service Manual page 4099

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK VEHICLE FOR SPECIFICATION.
Check the vehicle for destination and specifica-
tion.
2 CHECK NEUTRAL POSITION SWITCH.
1) Connect the Subaru Select Monitor to data
link connector.
2) Turn the ignition switch and Subaru Select
Monitor switch to ON.
3) Select {Engine} from the main menu.
4) Then, select {Current Data Display &
Save}.
5) Check the neutral position switch signal by
shifting the select lever to "P" or "N" range.
3 CHECK TCM OUTPUT VOLTAGE.
1) Turn the ignition switch to ON.
2) Measure the voltage between TCM har-
ness connector terminal and chassis ground.
Connector & terminal
(B55) No. 19 (+) — Chassis ground (
4 CHECK HARNESS BETWEEN TCM AND
ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
TCM and ECM.
3) Measure the resistance between TCM har-
ness connector terminal and ECM harness
connector terminal.
Connector & terminal
(B137) No. 9 — (B55) No. 19:
5 CHECK TRANSMISSION TYPE.
6 CHECK INHIBITOR SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the inhibitor switch harness
connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
2.5 L EC, K4 and EK model:
(T7) No. 12 (+) — Chassis ground (
2.0 L non-turbo model, 2.5 L KS, KA
model:
(T7) No. 7 (+) — Chassis ground (
7 CHECK INHIBITOR SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the starter motor harness con-
nector.
3) Measure the resistance between inhibitor
switch harness connector terminal and chassis
ground.
Connector & terminal
2.5 L EC, K4 and EK model:
(T7) No. 7 — Chassis ground:
2.0 L non-turbo model, 2.5 L KS, KA
model:
(T7) No. 12 — Chassis ground:
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Check
Is the vehicle turbo model or
3.0 L model?
Is ON displayed in the Subaru
Select Monitor when the select
lever is in "P" or "N" range?
Or is OFF displayed in the
Subaru Select Monitor when
the select lever is in other than
"P" or "N" range?
Is the voltage more than 10 V
when the select lever is in
other than "P" or "N" range?
Or is the voltage less than 1 V
when the select lever is in "P"
−
): or "N" range?
Is the resistance less than 10
Ω?
Is the transmission type AT?
Is the voltage approx. 5 V?
−
):
−
):
Is the resistance less than 10
Ω?
CC(diag)-27
Yes
Go to step 2. Go to step 5.
Replace the ECM. Go to step 3.
<Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>
Go to step 4. Inspect the TCM.
<Ref. to 5AT(diag)-
2, Basic Diagnos-
tic Procedure.>
Replace the ECM. Repair the wiring
<Ref. to harness.
FU(H4DOTC)-34,
Engine Control
Module (ECM).>
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>
Go to step 6. Go to step 9.
Go to step 7. Check the harness
for open or short
between inhibitor
switch and ECM.
Go to step 8. Repair the har-
ness.
No