Subaru Legacy III (2000-2003 year). Service manual — part 600
AT-134
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
20
CHECK INDICATOR LIGHT.
Does combination meter “1” range indicator
illuminate?
1 range indicator lights up.
21
CHECK “1” RANGE SWITCH.
When the “2” range is selected, does “1” range
LED light UP?
LED lights up.
Go to step CHECK
HOLD SWITCH.
<Ref. to AT-144,
CHECK HOLD
SWITCH., Diag-
nostic Procedure
for No-diagnostic
Trouble Code
(DTC).>
22
CHECK HARNESS CONNECTOR BETWEEN
INHIBITOR SWITCH AND CHASSIS
GROUND.
1) Turn ignition switch to OFF.
2) Disconnect connector from inhibitor switch.
3) Measure resistance of harness between
inhibitor switch and chassis ground.
Connector & terminal
(T7) No. 5 — Chassis ground:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between inhibitor
switch connector
and chassis
ground, and poor
contact in cou-
pling connector.
23
CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and
inhibitor switch.
3) Measure resistance of harness between
TCM and inhibitor switch connector.
Connector & terminal
(B55) No. 1 — (T7) No. 9
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.
24
CHECK INPUT SIGNAL FOR TCM.
1) Turn ignition switch to OFF.
2) Connect connector to TCM and inhibitor
switch.
3) Turn ignition switch to ON.
4) Move select lever to P range.
5) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 1 (+) — Chassis ground (–):
Is the measured value less than the speci-
fied value?
1 V
25
CHECK INPUT SIGNAL FOR TCM.
1) Position select lever to any other than P
range.
2) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 1 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
8 V
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Step
Value
Yes
No
AT-135
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
26
CHECK “P” RANGE INDICATOR LIGHT
BULB.
1) Turn ignition switch to OFF.
2) Remove combination meter.
3) Remove “P” range indicator light bulb from
combination meter.
Is “P” range indicator light bulb OK?
Bulb is normal.
Replace “P” range
indicator light bulb.
<Ref. to IDI-14,
Combination
Meter Assembly.>
27
CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Disconnect connectors from TCM and com-
bination meter.
2) Measure resistance of harness between
TCM and combination meter.
Connector & terminal
Except 3.0 L model and TURBO model:
(B55) No. 1 — (i11) No. 1:
3.0 L model and TURBO model:
(B55) No. 1 — (i10) No. 14:
Does the measured value exceed the spec-
ified value?
1
Ω
Repair open circuit
in harness
between inhibitor
switch connector
and combination
meter, and poor
contact in cou-
pling connector.
28
CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM, inhibitor
switch and combination meter.
3) Measure resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 1 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in “P”
range circuit.
29
CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and
inhibitor switch.
3) Measure resistance of harness between
TCM and inhibitor switch connector.
Connector & terminal
(B55) No. 3 — (T7) No. 8:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.
30
CHECK INPUT SIGNAL FOR TCM.
1) Turn ignition switch to OFF.
2) Connect connector to TCM and inhibitor
switch.
3) Turn ignition switch to ON.
4) Move select lever to R range.
5) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 3 (+) — Chassis ground (–):
Is the measured value less than the speci-
fied value?
1 V
Step
Value
Yes
No
AT-136
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
31
CHECK INPUT SIGNAL FOR TCM.
1) Position select lever to any other than R
range.
2) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 3 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
8 V
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
32
CHECK “R” RANGE INDICATOR LIGHT
BULB.
1) Turn ignition switch to OFF.
2) Remove combination meter.
3) Remove “R” range indicator light bulb from
combination meter.
Is “R” range indicator light bulb OK?
Bulb is normal.
Replace “R” range
indicator light bulb.
<Ref. to IDI-14,
Combination
Meter Assembly.>
33
CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Disconnect connectors from TCM and com-
bination meter.
2) Measure resistance of harness between
TCM and combination meter.
Connector & terminal
Except 3.0 L model and TURBO model:
(B55) No. 3 — (i11) No. 2:
3.0 L model and TURBO model:
(B55) No. 3 — (i10) No. 22:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between TCM
connector and
combination
meter, and poor
contact in TCM
connector.
34
CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM, inhibitor
switch and combination meter.
3) Measure resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 3 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in “R”
range circuit.
35
CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and
inhibitor switch.
3) Measure resistance of harness between
TCM and inhibitor switch connector.
Connector & terminal
(B55) No. 14 — (T7) No. 10:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.
Step
Value
Yes
No
AT-137
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
36
CHECK INPUT SIGNAL FOR TCM.
1) Turn ignition switch to OFF.
2) Connect connector to TCM and inhibitor
switch.
3) Turn ignition switch to ON.
4) Move select lever to N range.
5) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 14 (+) — Chassis ground (–):
Is the measured value less than the speci-
fied value?
1 V
37
CHECK INPUT SIGNAL FOR TCM.
1) Position select lever to any other than N
range.
2) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 14 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
8 V
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
38
CHECK “N” RANGE INDICATOR LIGHT
BULB.
1) Turn ignition switch to OFF.
2) Remove combination meter.
3) Remove “N” range indicator light bulb from
combination meter.
Is “N” range indicator light bulb OK?
Bulb is normal.
Replace “N” range
indicator light bulb.
<Ref. to IDI-14,
Combination
Meter Assembly.>
39
CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Disconnect connectors from TCM and com-
bination meter.
2) Measure resistance of harness between
TCM and combination meter.
Connector & terminal
Except 3.0 L model and TURBO model:
(B55) No. 14 — (i11) No. 3:
3.0 L model and TURBO model:
(B55) No. 14 — (i10) No. 21:
Does the measured value exceed the spec-
ified value?
1
Ω
Repair open circuit
in harness
between inhibitor
switch connector
and combination
meter.
40
CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM, inhibitor
switch and combination meter.
3) Measure resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 14 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in “N”
range circuit.
Step
Value
Yes
No
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