Subaru LEGACY 2006 Manual page 3614

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AR:DTC P1799 INTERLOCK
DTC DETECTING CONDITION:
Perform the interlock judgment when the oil pressure switch pattern detects the specified interlock patterns
other than shifting.
TROUBLE SYMPTOM:
Locked to 2nd or 4th gear depending on the vehicle condition at the time of diagnosis.
Step
1 CHECK DTC OF TCM.
2 DRIVING CHECK.
1) Turn the ignition switch to OFF.
2) After starting the engine again, perform a
drive check with the following conditions.
(1) Keep the speed at 20 km/h with SPORT
shift mode in 1st.
(2) Read the I/C oil pressure switch data of
TCM while driving using Subaru Select
Monitor.
3 DRIVING CHECK.
1) Turn the ignition switch to OFF.
2) After starting the engine again, perform a
drive check based on the Inspection Mode with
the following conditions. <Ref. to 5AT(diag)-20,
PROCEDURE, Inspection Mode.>
(1) Keep the speed at 20 km/h with manual
mode in 1st.
(2) Read the D/C oil pressure switch data
while driving using Subaru Select Monitor.
4 DRIVING CHECK.
1) Turn the ignition switch to OFF.
2) After starting the engine again, perform a
drive check with the following conditions.
(1) Drive the vehicle at the same speed
with manual mode in 3rd, 4th and 5th.
(2) Read the LC/B oil pressure switch data
while driving using Subaru Select Monitor.
5 DRIVING CHECK.
1) Turn the ignition switch to OFF.
2) After restarting the engine, perform a drive
check based on the Inspection Mode. <Ref. to
5AT(diag)-20, PROCEDURE, Inspection
Mode.>
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is any DTC of the followings
detected? P0751, P0753,
P0756, P0758, P0761, P0763,
P0766, P0768, P0771, P0773,
P1798
Is OFF displayed?
Is OFF displayed?
Is OFF displayed?
Is DTC displayed?
5AT(diag)-121
Yes No
Go to step 2.
Perform the diag-
nosis according to
DTC.
Go to step 3. Perform the diag-
nosis according to
DTC P0756.
Go to step 4. Perform the diag-
nosis according to
DTC P0766.
Go to step 5.
Perform the diag-
nosis according to
DTC P0771.
Replace the con- Temporary poor
trol valve body. contact occurs.
Check that the
harness connec-
tor is not faulty.