Subaru 2002 IMPREZA Service Manual page 1652

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
G: DTC 38 TORQUE CONTROL SIGNAL
DIAGNOSIS:
• The signal circuit is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
B56
8
1 2 3 4 7
5 6
10 11 12 13 14 15 16 17 18
21 22 23 24
19 20
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from TCM and
ECM.
3)Measure the resistance of harness between
TCM and ECM connector.
Connector & terminal
NON-TURBO MODEL
(B56) No. 14 — (B135) No. 17:
(B56) No. 5 — (B135) No. 16:
TURBO MODEL
(B56) No. 14 — (B134) No. 18:
(B56) No. 5 — (B134) No. 19:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B56) No. 14 — Chassis ground:
(B56) No. 5 — Chassis ground:
B135
1 2 3
9
8 9 10 11 12 13
20 21 22 23
B56 TCM
:
NA B135
ECM
B134
TB :
: NA
4 5 6 7
14 15 16 17 18 19
24 25 27 28
26
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
AT-66
: NON-TURBO MODEL
NA
TB : TURBO MODEL
: TB
B134
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15
16 17 18 19 20 21 22
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
ECM connector.
Go to step 3. Repair the short
circuit in harness
between TCM and
ECM connector.
TR0920
No