Subaru LEGACY 2006 Manual page 3590

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AG:DTC P1601 TCM DATA COMMUNICATION FAILURE
DTC DETECTING CONDITION:
Communication does not complete between control valve memory box.
TROUBLE SYMPTOM:
Shifting quality malfunction
WIRING DIAGRAM:
Step
1 CHECK IMPROPER CONNECTION OF
TRANSMISSION CONNECTOR.
Check loose connection on TCM connector
(B54).
2 CHECK DTC OF TCM.
B54
TCM
B11
T15
TRANSMISSION
Is there improper connection of
connector?
Is DTC of oil pressure switch
detected?
5AT(diag)-97
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
1 2 3 4
10 11 12 13 14 15 16 17 18
19 20 21
1 2
5
9 10
13
17 18
1 2 3
7 8 9 10 11 12 13 14
Check Yes
Connect it
securely.
Perform the diag-
nosis according to
DTC.
B54
5 6 7 8 9
22 23 24
B11
3 4
6 7 8
11 12
14 15 16
19 20
T15
4 5 6
15 16
AT-03471
No
Go to step 2.
Go to step 3.