Subaru LEGACY 2006 Manual page 3461

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 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 the 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, but this
does not indicate a malfunction. When AT con-
trol diagnosis is finished, perform the ABS
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-25, Clear
Memory Mode.>
4) Measure the AC voltage between TCM
connector terminals.
Connector & terminal
(B54) No. 24 (+) — No. 23 (–):
8 CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1) Connect the connectors to TCM and trans-
mission.
2) Lift up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off the floor.
3) Set the oscilloscope to TCM connector ter-
minals.
Connector & terminal
Positive probe; (B54) No. 24:
Ground lead; (B54) No. 23:
4) 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, but this
does not indicate a malfunction. When AT con-
trol diagnosis is finished, perform the ABS
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-25, Clear
Memory Mode.>
5) Measure the signal voltage indicated on
oscilloscope.
9 CHECK POOR CONTACT.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the voltage approx. 2 V or
more?
Is the pulse voltage approx. 5
V?
Is there poor contact in rear
vehicle speed sensor circuit?
4AT(diag)-75
Yes No
Go to step 9. Replace the rear
vehicle speed sen-
sor.
Go to step 9.
Replace the rear
vehicle speed sen-
sor.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-62,
Transmission Con-
trol Module
(TCM).>