Subaru 2006 Legacy, Manual

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5AT(diag)-53
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
N: DTC P0736 REVERSE INCORRECT RATIO
DTC DETECTING CONDITION:
Target gear ratio and actual gear ratio do not match.
TROUBLE SYMPTOM:
• Shift point is too high or too low.
• Excessive shift shock.
• Gear is not changed.
• The vehicle does not move in D or R range with the engine running at high speed.
Step Check Yes No
1 CHECK DTC OF TCM. Is any DTC of the followings
detected? P0715, P0720,
P0753, P0758, P0763, P0768,
P0773, P0751, P0756, P0761,
P0766, P0771, P1706, P1710,
P1798, P1799 Perform the diag-
nosis according to
DTC. Go to step 2 .
2 CHECK TURBINE SPEED SENSOR USING
SUBARU SELECT MONITOR.
1) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
2) Start the engine, and drive it.
3) Read the current data of torque converter
turbine speed using Subaru Select Monitor.
<Ref. to 5AT(diag)-16, READ CURRENT
DATA, OPERATION, Subaru Select Monitor.>
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
does not indicate a malfunction. When AT con-
trol diagnosis is finished, perform the VDC
memory clearance procedure of on-board diag-
nostics system. <Ref. to VDC(diag)-20, CLEAR
MEMORY MODE, OPERATION, Subaru Se-
lect Monitor.>
Does the displayed value of the
Subaru Select Monitor change
according to engine speed and
shifting? Go to step
3
. Perform the diag-
nosis according to
DTC P0715,
P1710.
3 CHECK FRONT AND REAR VEHICLE
SPEED SENSORS. Do the values displayed for
each of the Subaru Select
Monitor and the speedometer
substantially match? Go to step 4 . Perform the diag-
nosis according to
DTC P0720,
P1706.
4 CHECK INHIBITOR SWITCH.
Do the values displayed for the
Subaru Select Monitor and the
meter indicator match? Go to step
5
. Perform the diag-
nosis according to
DTC P0705.
5 DRIVING CHECK.
1) Turn the ignition switch to OFF.
2) After restarting the engine, check that the
SPORT indicator light is not blinking, and per-
form a drive check based on the Inspection
Mode. <Ref. to 5AT(diag)-20, PROCEDURE,
Inspection Mode.>
Is DTC displayed again? Check the DTC.
Then, when pro-
ceeded again to
step 5, go to step
6. Go to step
6
.
6 CHECK AFTER REPAIR.
Is the trouble symptom inre-
pairable (malfunction in shifting
such as excessive shift shock,
engine speed increases exces-
sively when shifting)? Replace the trans-
mission assembly. Temporary poor
contact occurs.
Check that the
harness connec-
tor is not faulty.
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