Subaru 2002 IMPREZA Service Manual page 1632

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
C: DTC 27 ATF TEMPERATURE SENSOR
DIAGNOSIS:
The input signal circuit of TCM to ATF temperature sensor is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
AT1
2 1
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from transmission
and TCM.
3)Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 20 — (B11) No. 12:
B11
1 2 3 4
1 2 3 4
5 6 7 8
10 11 12
9 10 11 12
19 20 21
13 14 15 16
17 18 19 20
B54
TCM
B11
T4
AT1
TRANSMISSION
B54
5 6 7 8 9
13 14 15 16 17 18
22 23 24
Check
Is the resistance less than 1
Ω?
AT-46
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
transmission con-
nector.
S3M0626
No