Subaru 2003 LEGACY Service Manual page 152

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
10 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SPORT SHIFT SWITCH.
1) Disconnect connector from TCM.
2) Measure resistance of harness between
TCM connector and SPORT shift switch
connector.
Connector & terminal
(B237) No. 5 — (B55) No. 15:
Is the measured value less than the speci-
fied value?
11 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SPORT SHIFT SWITCH.
1) Disconnect connector from TCM.
2) Measure resistance of harness between
SPORT shift switch connector and chassis
ground.
Connector & terminal
(B237) No. 5 — Chassis ground:
Does the measured value exceed the spec-
ified value?
12 CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to TCM and SPORT
shift switch.
2) Turn ignition switch to ON. (Engine is
stopped.)
3) Move select lever to normal mode.
4) Measure signal voltage for TCM.
Connector & terminal
(B55) No. 15 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
13 CHECK INPUT SIGNAL FOR TCM.
1) Move select lever to SPORT shift mode.
2) Measure signal voltage for TCM.
Connector & terminal
(B55) No. 15 (+) — Chassis ground (–):
Is the measured value less than the speci-
fied value?
14 CHECK SPORT SHIFT SWITCH GROUND
LINE.
1) Turn ignition switch to OFF.
2) Disconnect connector from SPORT shift
switch.
3) Measure resistance of harness between
SPORT shift switch connector and chassis
ground.
Connector & terminal
(B237) No. 6 — Chassis ground:
Is the measured value less than the speci-
fied value?
15 CHECK SPORT SHIFT SWITCH.
1) Measure resistance between SPORT shift
switch terminals.
Connector & terminal
(B237) No. 6 — No. 2:
Does the measured value exceed the spec-
ified value?
Step Value
1 Ω
1 MΩ
9 V
1 V
1 Ω
1 MΩ
AT-150
Yes
Go to step 11. Repair open circuit
in harness
between SPORT
shift switch con-
nector and TCM
connector and
poor contact in
coupling connec-
tor.
Go to step 12. Repair short circuit
in harness
between SPORT
shift switch con-
nector and TCM
connector.
Go to step 13. Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Go to step 35. Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Go to step 15. Repair open circuit
in harness
between SPORT
shift switch and
chassis ground.
Go to step 16. Replace guide
plate assembly.
No