Page 297 of 2389
MEASURE GOVERNOR PRESSURE (A1401)
(a) Check the parking brake to see that it is not applied.
(b) Start the engine.
(c) Shift into D range and measure the governor pressures at the speeds specified in the table.
EVALUATION
If governor pressure is defective:
wLine pressure defective
wFluid leakage in governor pressure circuit
wGovernor valve operation defective .
Vehicle speed (Reference only)
Drive pinion shaftGovernor pressure
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ROAD TEST (A140E)
NOTICE: Perform the test at normal operating fluid
temperature (122 ± 176°F or 50 ± 84°C). .
1. D RANGE TEST IN NORM AND PWR PATTERN
RANGES
Shift into the D range and hold the accelerator pedal
constant at the full throttle valve opening position.
Check the following:
(a) 1±2, 2±3 and 3±O/D up±shifts should take place, and
shift points should conform to those shown in the au-
tomatic shift schedule. (See page AT±49)
Conduct a test under both Normal and Power patterns.
HINT:
There is no O/D up±shift when coolant temperature is
below 122
°F (50°C).
There is no lock±up when the vehicle speed is 10 km/h (6
mph) less than the set cruise control speed.
EVALUATION
(1) If there is no 1 ± 2 up±shift:
wNo. 2 solenoid is stuck
w1±2 shift valve is stuck
(2) If there is no 2 ± 3 up±shift:
w No. 1 solenoid is stuck
w2±3 shift valve is stuck
(3) If there is no 3 ± O/D up±shift:
w3±O/D shift valve is stuck
(4) If the shift point is defective:
wThrottle valve, 1±2 shift valve, 2±3 .shift valve, 3±
wO/D shift valve etc., are defective
(5) If the lock±up is defective:
wLock±up solenoid is stuck
wLock±up relay valve is stuck
(b) In the same manner, check the shock and slip at the 1
±2, 2 ± 3 and 3 ± O/D up±shifts.
EVALUATION
If the shock is excessive:
wLine pressure is too high
wAccumulator is defective
wCheck ball is defective
(c) Run at the D range lock±up or O/D gear and check for
abnormal noise and vibration.
HINT: The check for the cause of abnormal noise and
vibration must be make with extreme care as it could
also be due to loss of balance in the drive shaft, tire,
torque converter, etc.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
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2. 2 RANGE TEST
Shift into the 2 range and, while driving with the accel-
erator pedal held constantly at the full throttle valve
opening position, push in one of the pattern selectors
and check on the following points.
(a) Check to see that the 1 ±2 up±shift takes place and
that the shift point conforms to it shown on the auto-
matic shift schedule. (See page AT±49)
(b) White running in the 2 range and 2nd gear, re-
lease the accelerator pedal and check the en-
gine braking effect.
EVALUATION
If there is no engine braking effect:
wSecond coast brake is defective (d) While running in the D range, 2nd, 3rd and O/D
gears, check to see that the possible kick±
down vehicle speed limits for 2 ±1, 3 ±2 and O/D
±3 kickdowns conform to those indicated on the
automatic shift schedule. (See page AT±49)
(e) Check for abnormal shock and slip at kick±down.
(f) Check for the lock±up mechanism:
(1) Drive in D range ± O/D gear, at a steady speed
(lock±up ON) of about 75 km/h (47 mph).
(2) Lightly depress the. accelerator pedal and check
that the engine rpm does not change abruptly.
If there is a big jump in engine rpm, there is no
lock±up.
(e) Check for abnormal noise at acceleration and
deceleration, and for shock at up±shift and
downshift.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
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(b) White running in the L range, release the acceler-
ator pedal and check the engine braking effect.
EVALUATION
If there is no engine braking effect:
First and reverse brake is defective
5. P RANGE TEST
Stop the vehicle on a gradient (more than 5
°) and after
shifting into the P range, release the parking brake.
Then check to see that the parking lock pawl holds the vehicle
in place.
3. L RANGE TEST
(a) White running in the L range, check to see that there is
no up±shift to 2nd gear.
4. R RANGE TEST
Shift into the R range and, while starting at full throttle,
check for slipping.(c) Check for abnormal noise during acceleration
and deceleration.
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A140E)AT±45
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ROAD TEST (A140L)
NOTICE: Perform the test at norrnal operating fluid tem-
perature (122 ± 176°F or 50 ± 80°C).
1. D RANGE TEST
Shift into the D range and hold the accelerator pedal
constant at the full throttle valve opening position.
Check the following:
(a) 1±2, 2±3 and 3±0ID up±shifts should take place, and
shift points should conform to those shown in the au-
tomatic shift schedule. (See page AT±49)
EVALUATION
(1) If there is no 1 ±2 up±shift:
wGovernor valve is defective
w 1±2 shift valve is stuck
(2) if there is no 2 ±3 up±shift:
w 2±3 shift valve is stuck .
(3) If there is no 3 ± O/D up±shift:
w3±O/D shift valve is stuck
wO/D solenoid is defective
(4) If the shift point is defective:
wThrottle cable is out±of±adjustment
wThrottle valve, 1±2 shift valve, 2±3 shift valve, 3±
O/D shift valve etc., are defective
(b) In the same manner, check the shock and slip at the
1± 2, 2 ± 3 and 3 ± O/D up±shifts.
EVALUATION
If the shock is excessive:
wLine pressure is too high
Accumulator is defective
wCheck ball is defective
(c) Run at the D range lock±up or O/D gear and check for
abnormal noise and vibration.
HINT: The check for the cause of abnormal noise and
vibration must be make with extreme care as it could
also be due to loss of balance in the drive shaft, tire,
torque converter, etc.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
A140E)AT±46
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2. 2 RANGE TEST
Shift into the .2 range and, while driving with the accel-
erator pedal held constantly at the full throttle valve
opening position, check on the following points.
(a) Check to see that the 1 ± 2 up±shift takes place and
that the shift point conforms to it shown on the auto-
matic shift schedule. (See page AT±49) (f) Check for the lock±up mechanism.
(1) Drive in D range, O/D gear, at a steady speed
(lock±up ON) of about 70 km/h (43 mph).
(2) Lightly depress the accelerator pedal and check
that the engine rpm does. not change abruptly.
If there is a big jump in engine rpm, there is no
lock±up.
(b) While running in the 2 range and 2nd gear, re-
lease the accelerator pedal and check the en-
gine braking effect.
EVALUATION
If there is no engine braking effect:
Second coast brake is defective (d) While running in the D range, 2nd, 3rd and O/D
gears, check to see that the possible kick±
down vehicle speed limits for 2 ±1, 3 ±2 and
O/D ± 3 kickdowns conform to those indicated
on the automatic shift schedule. (See page
AT±49)
(e) Check for abnormal shock and slip at kick±down.
(c) Check for abnormal noise at acceleration and de-
celeration, and for shock at up±shift and down-
shift.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
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(b) While running in the L range, release the accelerator
pedal and check the engine braking effect.
EVALUATION
If there is no engine braking effect:
wFirst and reverse brake is defective
5. P RANGE TEST
Stop the vehicle on a gradient (more than 5
°) and after
shifting into the P range, release the parking brake.
Then check to see that the parking lock pawl holds the ve-
hicle in place.
4. R RANGE TEST
Shift into the R range and, while starting at full throttle,
check for slipping. 3. L RANGE TEST
(a) While running in the L range, check to see that there
is no up±shift to 2nd gear.
(c) Check for abnormal noise during acceleration
and deceleration.
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*O/D main switch OFF
HINT:
(1) In the 2 and L ranges, ail stages lock±up is OFF.
(2) In the following cases, the lock±up will be released regardless of the lock±up pattern.
When the throttle is completely closed.
When the brake light switch is ON.
*1 3 ± O/D up±shift point with closed throttle valve is at 32 ± 45 km/h (20 ± 28 mph).
*2 Lock±up ºONº' point with closed throttle valve is at 64 ± 73 km/h (40 ± 45 mph).
*3 Lock±up ºOFFº point with closed throttle valve is at 60 ± 68 km/h (37 ± 42 mph).
*4 O/D ±3 down±shift is possible up to maximum speed.
Automatic Shift Schedule
(A140E)
Throttle valve fully open [ ] Fully closed
D range (Throttle valve fully open) Throttle valve opening 5%
Differential
gear ratio
(A140L)
km/h (mph)
Lock±up OFF
km/h (mph) km/h (mph)
Lock±up ON NORM
PWR NORM
PWR
L
range D range
2 range
D range
L range
NORMNORM
3.736
PWRPWR
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
A140E)AT±49