Toyota ZZT230 series Repair Manual page 372

)
PROBLEM SYMPTOM CONFI R MATION
4.
Taki n g i n t o
consideration the results of the customer problem analysis, try to reproduce the symptoms of the
conduct
trouble. If the problem is that the transaxle does not up-shift, down-shift, or the shift point is too high or too
low,
ROADTEST
toms.
NOTI C E:
5.
Perform t h e test at normal operati n g ATF temperature
D
(a) position test
Shift into
Check up-shift operation.
(1)
)
Check to see that 1
•
HI N T:
form to the automatic shift schedule (See page SS--4 1 ).
OlD
•
kmlh
Gear Up-shift Prohibition Control
010
(6 mph) difference between the set cruise control speed and vehicle speed.)
Gear lock�p Prohibition Control ( 1 . Brake pedal is depressed. 2. Coolant temp. is 60
(140 'F) or less.)
Check for shift shock and slip.
(2)
Check for shock and slip at the
(3) Check for abnormal noises and vibration.
HI N T:
Drive in the D position lock-up or OlD gear and check for abnormal noises and vibration.
The
of
check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
due to loss
(4) Check kick-<iown operation.
W
vehicle speed limits for 2
the automatic shift schedule {See page SS--4 1 )
•
Check abnormal shock and slip at kick-down.
(5)
(6) Check the lock-up mechanism.
•
If there is a big jump
)
the following road test to confirm the automatic shift schedule and simulate the problem symp­
the
0
position and fully depress the accelerator pedal and check the following points.
�
2, 2
balance in the differential torque converter clutch, etc.
n n
e
l
h i g in the 0
ru n i position, 2nd, 3rd and 0/D gears, check to see that the possible kick-down
--t 1 ,
0
position, OlD gear, at a steady speed (lock-up ON) of about 60 km/h (37 mph).
Drive in
Lightly depress the accelerator pedal and check that the engine speed does not change
i n
abruptly.
engine speed, there is no lock-up.
DIAGNOSTICS
AUTOMATIC TRANSAXLE (U240El
(b) Clear the DTC.
The following operation will erase the DTC and freeze
frame data. Operating an OBO II scan tool (complying
with SAE J1 978) or TOYOTA hand-held tester to erase
the codes.
(See the OBD
NOTI C E:
instructions.)
I f the TOYOTA hand-hel d t e st e r swi t ches the ECM
Normal mode to Check mode or vi c e-versa, of I f the l g nl ·
li o n swi t ch I s turned from ON to ACC
mode, the DTCs and f r eeze frame dat a
50 - 80
�
3 and 3 --t OlD up-shift takes place, and that the shift points con­
( 1 . Coolant temp. is 60
--t 2, 2 --t 3 and 3 --t OlD up-shifts.
1
--t
.
3 2 and OlD --t 3 kick-downs conform to those indicated on
II scan tool's instruction book for operating
OFF duri n g chi c k
or
w i l
'F).
'c
(122 - 176
"F)
"C (140 or less. 2. If there is a 1 0
m-1s1
from
l erased.
be
"C