Subaru IMPREZA GD 2007 Series Manual page 2715

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmission
and TCM.
3) Measure the resistance of harness between
TCM connector and transmission connector.
Connector & terminal
(B54) No. 5 — (B11) No. 6:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 5 — Chassis ground:
3 CHECK LOW & REVERSE BRAKE DUTY SO-
LENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 6 — No. 20:
4 CHECK OUTPUT SIGNAL FROM TCM US-
ING SUBARU SELECT MONITOR.
1) Connect all connectors.
2) Connect the Subaru Select Monitor to the
data link connector.
3) Start the engine, and run the Subaru Select
Monitor.
4) Warm-up the transmission until the ATF
temperature exceeds approximately 80°C
(176°F).
NOTE:
If the ambient temperature falls below 0°C
(32°F), drive the vehicle until the ATF reaches
its operating temperature.
5) Stop the engine and turn the ignition switch
to ON (with engine OFF).
6) Shift the select lever to "P" or "N" range, and
depress the accelerator pedal.
7) Read the data of low & reverse brake duty
solenoid using Subaru Select Monitor.
• Low & reverse brake duty solenoid is indi-
cated in "%".
5 CHECK OUTPUT SIGNAL FROM TCM US-
ING SUBARU SELECT MONITOR.
1) Move the select lever to "1" range.
2) Read the data of the low & reverse duty
solenoid.
Check
Is resistance less than 1 Ω?
Is the resistance 1 MΩ or
more?
Is the resistance 2.0 — 6.0 Ω? Go to step 4.
Is the measured value 100%?
Is the measured value 55%?
4AT(D)(diag)-76
Yes No
Go to step 2. Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 6.
Go to step 5. Repair the poor
contact.
Even if the ATF Repair the poor
temperature warn- contact.
ing light blinks, the
circuit is in normal
condition at this
time. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
harness or con-
nector in TCM and
transmission.