Toyota ZZT230 series Repair Manual page 435

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PROBLEM SYMPTOM CONFI R MATI O N
4.
Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the
trouble. If the problem is that the transaxle does not up-shift, down-shift, or the shift point is too high or too
low, conduct the following road test to confirm the automatic shift schedule and simulate the problem symp�
ROADTEST
toms.
NOTI C E:
5.
Perform the test at normal operati n g ATF temperature
(a) D position test
Shift into the D position and fully depress the accelerator pedal and check the following points.
Check up-shift operation.
(1)
Check to see that
form to the automatic shift schedule (See page 88-43).
HINT:
0/D Gear Up-shift Prohibition Control ( 1 . Coolant temp. is 60 ec (140 OF) or less. 2. It there is a 1 0
• km/h (6 mph) difference between the set cruise control speed and vehicle speed.)
OlD Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60 oc
(140 "F) or less.)
(2) Check for shift shock and slip.
Check for shock and slip at the 1 � 2, 2
(3) Check tor abnormal noises and vibration.
Drive in the D position lock-up or 0/D gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must
due to loss of balance in the differential torque converter clutch, etc.
(4) Check kick-down operation.
While running in the D position, 2nd, 3rd and 0/D gears, check to see that the possible kick-down
vehicle speed limits for 2
the automatic shift schedule (See page S8-43).
Check abnormal shock and slip at kick-down.
(5) (6 )
Check the lcck-<Jp mechanism.
Drive in D position, 0/D gear, at a steady speed (lock-up ON) of about 60 km/h (37 mph).
•
Lightly depress the accelerator pedal and check that the engine speed does not change
•
abruptly.
II there Is a big jump in engine speed, there is no lock-up.
-
Clear the DTC.
(b)
The following operation will erase the DTC and freeze
frame data. Operating an OBD II scan tool (complying
with SAE J1 978} or TOYOTA hand-held tester to erase
the codes.
(See the OBD II scan tool's instruction book for operating
NOTI C E:
instructions.)
I f the TOYOTA hand-hel d tester swi t ches the ECM from
Normal mode to Check mode or vi c e-versa, of i f the i g ni �
tl o n swi t ch I s turned from ON t o ACC or OFF duri n g chi c k
mode, the DTCs and freeze frame data wi l l be erased.
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2, 2 3 and 3 0/D up-shift takes place, and that the shift points con­
1 ---7
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1 , 3 2 and 0/D
50 - 80 ·c ( 122 - 176 "F).
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3 and 3 0/D up-shifts.
be
done very thoroughly as it could also be
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3 kick-downs conform to those indicated on