Lexus SC300 / Lexus SC400. Manual — part 75
MEASURE ACCUMULATOR BACK PRESSURE
AT0QU–01
NOTICE:
Perform the test at normal operating fluid temperature 50–80
C (122–176
F).
Be careful to prevent the oil pressure gauge hose from interfering with the exhaust pipe.
(a) Warm up the transmission fluid.
(b) Remove the test plug on the transmission case rear right side and connect the oil pressure gauge SST.
SST 09992–00094
HINT: Connecting the oil pressure gauge will be made easier by moving the RH side head insulator aside.
(c) Remove the passenger side No.2 under cover and ECM protector.
(d) Connect the SST (check harness A) between ECM and connector of vehicle wire harness.
SST: 09990–01000
(e) Install one test lead probe into the terminal SLN of the ECM wire harness side connector and take care
not to ground the other test lead probe.
HINT: Prepare test leads which are connected with an (approximately) 8 W light bulb.
AT–56
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
(f)
Fully apply the parking brake and chock the 4 wheels.
(g) Start the engine and check idling RPM.
(h) Keep your left foot pressed firmly on the brake pedal and shift into D position.
(i)
Measure the accumulator back pressure.
(j)
With the conditions the same as in (h), ground the other probe of the test lead which has one end inserted
into the terminal SLN of the ECM harness side connector, then measure the accumulator back pressure
again.
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–57
SPECIFIED ACCUMULATOR BACK PRESSURE
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
Condition if ECM terminal SLN
ÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑ
Not ground kPa (kgf/cm
2
, psi)
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Ground kPa (kgf/cm
2
, psi)
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
Accumulator back pressure
ÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑ
177–255 (1.8–2.6, 26–37)
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
0
EVALUATION
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Problem
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Possible cause
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Throttle cable out of adjustment
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Th
l t
b
k
i
t
ifi d
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Throttle valve defective
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
The accumulator back pressure is not as specified
(high or low) when the terminal SLN is not ground.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Solenoid modulator valve defective
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
(high or low) when the terminal SLN is not ground.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
SLN solenoid valve defective
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Accumulator control valve defective
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
The accumulator back pressure does not become 0
kgf/cm
2
when the terminal SLN is grounded.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
SLN solenoid valve defective
AT–58
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
MANUAL SHIFTING TEST
AT0QV–01
HINT: With this test, it can be determined whether the trouble
is within the electrical circuit or is a mechanical problem in the
transmission.
1.
DISCONNECT SOLENOID WIRE
2.
INSPECT MANUAL DRIVING OPERATION
Check that the shift and gear positions correspond with the
table below.
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
Shift Position
ÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑ
Gear Position
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
D Position
O/D
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
2 Position
3rd
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
L Position
1st
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
R Position
Reverse
ÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑ
P Position
Pawl Lock
HINT: If the L, 2 and D position gear positions are difficult to
distinguish, perform the following road test.
•
While driving, shift through the L, 2 and D positions.
Check that the gear change corresponds to the shift
position.
If any abnormality is found in the above test, the problem is
in the transmission itself.
3.
CONNECT SOLENOID WIRE
4.
CANCEL OUT DIAGNOSTIC TROUBLE CODE
(See page AT–39)
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–59
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