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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
4
CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Connect all the connectors.
2) Connect the Subaru Select Monitor to data
link connector.
3) Start the engine, and turn the Subaru
Select Monitor power switch to ON.
4) Warm-up the transmission until the ATF
temperature exceeds approx. 80°C (176°F).
NOTE:
If the ambient temperature is below 0°C (32°F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
5) Stop the engine and turn the ignition switch
to ON (engine OFF).
6) Shift the select lever to "N" range.
7) Read the data of low & reverse duty sole-
noid using Subaru Select Monitor.
• Low & reverse duty solenoid is indicated in
"%".
5
CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Lift-up the vehicle.
NOTE:
Raise all wheels off floor.
2) Shift the select lever to manual mode, and
then hold it on 1st. Slowly increase the vehicle
speed up to 15 km/h (9 MPH), and then return
the accelerator pedal.
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light or VDC
warning light, but this indicates no malfunction.
When AT control diagnosis is finished, perform
the ABS memory clearance procedure or VDC
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-26, Clear
Memory Mode.> <Ref. to VDC(diag)-25, Clear
Memory Mode.>
3) Read the data of low & reverse duty sole-
noid.
6
CHECK POOR CONTACT.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the value 100%?
Is the value 55%?
Is there poor contact in low &
reverse duty solenoid circuit?
4AT(diag)-79
Yes
Go to step 5.
Go to step 6.
Even if the SPORT
Go to step 6.
indicator light is
blinking, the cir-
cuit has returned
to normal condi-
tion at this time. A
temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the har-
ness or connector
in TCM and trans-
mission.
Repair the poor
Replace the TCM.
contact.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).>
No
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