Subaru 2009 IMPREZA Service Manual page 2045

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Q: DTC P0758 SHIFT SOLENOID "B" ELECTRICAL
DTC DETECTING CONDITION:
Output signal circuit of 2-4 brake duty solenoid is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock
WIRING DIAGRAM:
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness between
TCM connector and transmission connector.
Connector & terminal
(B54) No. 4 — (B11) No. 3:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 4 — Chassis ground:
3 CHECK 2-4 BRAKE DUTY SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 3 — No. 20:
B54 TCM
B11
T4
AT 2
2-4 BRAKE
DUTY
SOLENOID
CONTROL VALVE BODY
Is the resistance less than 1 ? Go to step 2.
Is the resistance 1 M or
more?
Is the resistance 2.0 — 6.0 ? Go to step 4.
4AT(diag)-60
Check Yes
Go to step 3.
AT2
1 2 3 4 5
6 7 8 9 10
B11
3 4
1 2
5 6 7 8
9 10 11 12
13 14 15
16
17 18 19 20
B54
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35
AT-04758
No
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 7.