1991 LEXUS SC400 Service Repair Manual

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Page 393 of 4087

LEXUS SC400 1991 Service Repair Manual
±Memo±
AT00X±01
AT±30±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION SHIFT LOCK SYSTEM
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Page 394 of 4087

LEXUS SC400 1991 Service Repair Manual
TROUBLESHOOTING
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±31
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Page 395 of 4087

$LEXUS SC400 1991 Service Repair Manual HOW TO PROCEED WITH TROUBLESHOOTING AT09N±0D 1. CUSTOMER PROBLEM ANALYSISUsing the customer problem analysis check sheet for reference, ask the c\ ustomer in as much detail as possible about the pr$

HOW TO PROCEED WITH TROUBLESHOOTING
AT09N±0D
1. CUSTOMER PROBLEM ANALYSISUsing the customer problem analysis check sheet for reference, ask the c\
ustomer in as much detail as
possible about the problem.
2. CHECK AND CLEAR THE DIAGNOSTIC TROUBLE CODES (PRECHECK) Before confirming the problem symptom, first check if there are any diagnostic\
trouble malfunction codes
stored in memory. When there are malfunction codes, make a note of them, then clear them\
and proceed
to ª3. Problem Symptom Confirmationº.
3. PROBLEM SYMPTOM CONFIRMATION Confirm the problem symptoms.
4. SYMPTOM SIMULATION If the problem does not reappear, be sure to simulate the problem by mainly checking the circuits indica\
ted
by the diagnostic trouble code in step 2., using ªProblem Simulation me\
thodº.
5. DIAGNOSTIC TROUBLE CODE CHECK Check the diagnostic trouble codes. Check if there is abnormality in the\
sensors or the wire harness.
If a malfunction code is output, proceed to ª6. Diagnostic Trouble Code Chartº.
If the normal code is output, proceed to ª11. Matrix Chart of Problem Symptomsº.
Be sure to proceed to ª6. Diagnostic Trouble Code Chartº after the steps 2. and 3. are completed.
If troubleshooting is attempted only by following the malfunction code sto\
red in the memory is output, errors
could be made in the diagnosis.
6. DIAGNOSTIC TROUBLE CODE CHART If a malfunction code is confirmed in the diagnostic trouble code check, p\
roceed to the inspection proce-
dure indicated by the matrix chart for each diagnostic trouble code.
7. PRELIMINARY CHECK Carry out a preliminary check of the transmission oil level, throttle ca\
ble adjustment, etc.
8. SHIFT POSITION SIGNAL CHECK
Carry out the shift position signal check when the transmission gears do\
not up±shift, down±shift or lock±
up. This is to check the output condition from the ECM to each solenoid. If the r\
esults are NG, then it is
likely that the trouble is in the electrical system (particularly in th\
e sensors or the ECM).
Proceed to Part 1 (Electrical System) under ª11. Matrix Chart of Problem Symptomsº. If all the circuits speci-
fied in Part 1 are OK, check the ECM and replace it.
9. MECHANICAL SYSTEM TEST (Stall Test, Time Lag Test, Line Pressure Test, Accumulator Back Pressure Test)
If the malfunction is found in the stall test, time lag test, line press\
ure test or accumulator back pressure
test, check the parts indicated in the respective tests. If the problem is th\
at ªshift shock is largeº, perform
the accumulator back pressure test.
10. MANUAL SHIFTING TEST If the results of the manual driving test are NG, it is likely that the trouble is in the mechanical system or
hydraulic system. Proceed to Part 2 (Mechanical System) under the Matrix Chart \
of Problem Symptoms.
AT±32
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTING
WhereEverybodyKnowsYourName

Page 396 of 4087

LEXUS SC400 1991 Service Repair Manual
11. MATRIX CHART OF PROBLEM SYMPTOMSIf the normal code is confirmed in the diagnostic trouble code check, perform inspection according to the
inspection order in the matrix chart of problem symptoms

Page 397 of 4087

LEXUS SC400 1991 Service Repair Manual
P. AT±35P. AT±37 ~ AT±38
P. AT±47
P. AT±60 P. AT±39
P. AT±50
P. AT±59
P. AT±65
P. AT±66 P. AT±68
P. AT±70
P. AT±78 ± AT±120
P. AT±37 ~ AT±38
P. IN±26
P. AT±41
AT±34
±
A304E (1UZ�

Page 398 of 4087

LEXUS SC400 1991 Service Repair Manual
MIRROR
Outside Rear View Mirror
COMPONENTS
REMOVAL AND INSTALLATION OF
OUTSIDE REAR VIEW MIRROR
HINT: Install the mirror by following the removal sequence
in reverse.
1. DISCONNECT BATTERY CABLE FRO

Page 399 of 4087

LEXUS SC400 1991 Service Repair Manual
REPLACEMENT OF OUTSIDE REAR
VIEW MIRROR
1. IF NECESSARY, DISCONNECT MIRROR(a) Insert the shop rag between the mirror and the mirrorbody to wrap up the mirror in the shop rag.
(b) Pull up the lower

Page 400 of 4087

LEXUS SC400 1991 Service Repair Manual
Inner Rear View Mirror
COMPONENTS
REMOVAL AND INSTALLATION OF
INNER REAR VIEW MIRROR
HINT: Install the mirror following removal sequence in re-
verse.
1. REMOVE CENTER VISOR (See step 4 on page BO

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