4AT(diag)-77
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
5
CHECK INDICATOR.
1) Turn the ignition switch to OFF.
2) Install a fuse to the FWD fuse holder.
3) Start the engine and wait for 2 seconds or
more.
Is the AWD warning light illumi-
nated?
Normal. Finish the
diagnosis.
Go to step
6
.
6
CHECK BODY INTEGRATED UNIT.
Is DTC of CAN communication
displayed?
Perform the diag-
nosis according to
DTC.
Go to step
7
.
7
CHECK TCM.
1) Turn the ignition switch to OFF.
2) Install a fuse to the FWD fuse holder.
3) Connect the Subaru Select Monitor to data
link connector.
4) Turn the ignition switch to ON.
5) Read the data of “FWD Switch” using Sub-
aru Select Monitor.
Is “ON” displayed?
Perform the self-
diagnosis of com-
bination meter.
Go to step
8
.
8
CHECK HARNESS CONNECTOR BETWEEN
TCM AND FUSE BOX.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
fuse box.
3) Measure the resistance of the harness
between TCM and fuse box.
Connector & terminal
(B54) No. 10 — (B158) No. 7:
Is the resistance less than 1
:
? Go to step
9
.
Repair the open
circuit of harness
between TCM and
fuse box.
9
CHECK HARNESS CONNECTOR BETWEEN
FUSE BOX AND CHASSIS GROUND.
Measure the resistance of the harness between
fuse box and chassis ground.
Connector & terminal
(i5) No. 13 — Chassis ground:
Is the resistance less than 1
:
? Go to step
10
.
Repair the open
circuit of harness
between fuse box
and chassis
ground.
10
CHECK POOR CONTACT.
Check poor contact of FWD switch circuit.
Is there poor contact of FWD
switch circuit?
Repair the poor
contact.
Replace the TCM.
<Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
11
CHECK TCM.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Start the engine.
4) Read the data of “Engine Speed” using Sub-
aru Select Monitor.
Is the measured value 400 rpm
or more?
Go to step
12
.
Inspect the ECM.
12
CHECK TCM.
Read the data of “FWD Switch” using Subaru
Select Monitor.
Is “OFF” displayed?
Perform the self-
diagnosis of com-
bination meter.
Go to step
13
.
13
CHECK HARNESS CONNECTOR BETWEEN
TCM AND FUSE BOX.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
fuse box.
3) Measure the resistance of harness connec-
tor between TCM and chassis ground.
Connector & terminal
(B54) No. 10 — Chassis ground:
Is the resistance 1 M
:
or
more?
Replace the TCM.
<Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
Repair the short
circuit of harness
between TCM and
fuse box.
Step
Check
Yes
No
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