Subaru 2003 LEGACY Service Manual page 154

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
22 CHECK SPORT SHIFT SWITCH.
Measure resistance between SPORT shift
switch terminals.
Connector & terminal
(B237) No. 3 — No. 1:
Does the measured value exceed the spec-
ified value?
23 CHECK SPORT SHIFT SWITCH.
1) Move select lever to SPORT shift mode.
2) Measure resistance between SPORT shift
switch terminals.
Connector & terminal
(B237) No. 3 — No. 1:
Is the measured value less than the speci-
fied value?
24 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. 1 — (B55) No. 2:
Is the measured value less than the speci-
fied value?
25 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SPORT SHIFT SWITCH.
1) Disconnect steering roll connector.
2) Measure resistance of harness between
SPORT shift switch connector and chassis
ground.
Connector & terminal
(B237) No. 1 — Chassis ground:
Does the measured value exceed the spec-
ified value?
26 CHECK INPUT SIGNAL FOR TCM.
1) Connect all connectors.
2) Turn ignition switch to ON. (Engine is
stopped.)
3) Measure signal voltage for TCM.
Connector & terminal
(B55) No. 2 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
27 CHECK INPUT SIGNAL FOR TCM.
1) Move select lever to shift up side.
2) Measure signal voltage for TCM.
Connector & terminal
(B55) No. 2 (+) — Chassis ground (–):
Is the measured value less than the speci-
fied value?
Step Value
1 MΩ
1 Ω
1 Ω
1 MΩ
9 V
1 V
AT-152
Yes
Go to step 24. Replace guide
plate assembly.
Go to step 24. Replace guide
plate assembly.
Go to step 25. Repair open circuit
in harness
between SPORT
shift switch con-
nector and TCM
connector and
poor contact in
coupling connec-
tor.
Go to step 26. Repair short circuit
in harness
between SPORT
shift switch con-
nector and TCM
connector.
Go to step 27. 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).>
No