Subaru Legacy 2005 Service Manual page 2257

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
6 CHECK INPUT SIGNAL FOR TCM.
1) Connect the connectors to TCM and trans-
mission.
2) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
3) Start the engine and set vehicle in 20 km/h
(12 MPH) condition.
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light or VDC
warning light, but this indicates no malfunction.
When AT control diagnosis is finished, perform
the ABS memory clearance procedure or VDC
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-26, Clear
Memory Mode.> <Ref. to VDC(diag)-25, Clear
Memory Mode.>
4) Measure the AC voltage between TCM
connector terminals.
Connector & terminal
(B54) No. 24 (+) — No. 23 (
7 CHECK POOR CONTACT.
Is the voltage approx. 2 V or
more?
−
):
Is there poor contact in rear
vehicle speed sensor circuit?
4AT(diag)-85
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Go to step 7.
Repair the poor
contact.
Yes No
Replace the rear
vehicle speed sen-
sor.
Replace the TCM.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).>