Subaru 2003 LEGACY Service Manual page 58

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND THROTTLE POSITION SENSOR.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 2 — Chassis ground:
Does the measured value exceed the specified
value?
9 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
Measure resistance of harness between TCM
and ECM connector.
Connector & terminal
Non-TURBO without OBD model:
(B54) No. 3 — (B136) No. 17:
Non-TURBO with OBD model:
(B54) No. 3 — (B135) No. 13:
TURBO model:
(B54) No. 3 — (B135) No. 7:
3.0 L model:
(B54) No. 3 — (B135) No. 7:
Is the measured value less than the specified
value?
10 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
Measure resistance of harness between TCM
and ECM connector.
Connector & terminal
Non-TURBO without OBD model:
(B54) No. 2 — (B136) No. 15:
Non-TURBO with OBD model:
(B54) No. 2 — (B135) No. 3:
TURBO model:
(B54) No. 2 — (B135) No. 9:
3.0 L model:
(B54) No. 2 — (B135) No. 9:
Is the measured value less than the specified
value?
11 PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?
12 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM, throttle posi-
tion sensor and ECM.
2) Turn ignition switch to ON (engine OFF).
3) Close the throttle completely.
4) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 3 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
13 CHECK INPUT SIGNAL FOR TCM.
1) Open the throttle completely.
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 3 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
Step Value
1 MΩ
1 Ω
1 Ω
Subaru Select Monitor is avail-
able.
0.2 — 1.0 V
4.2 — 4.7 V
AT-56
Yes
Go to step 9. Repair short circuit
in harness
between TCM and
throttle position
sensor connector.
Go to step 10. Repair open circuit
in harness
between TCM and
ECM connector.
Go to step 11. Repair open circuit
in harness
between TCM and
ECM connector.
Go to step 14. Go to step 12.
Go to step 13. Go to step 18.
Go to step 16. Go to step 18.
No