Page text (OCR transcript)
PROBLEM SYMPTOM CONFIRMATION
Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of
the trouble. If the problem is that the transmission does not up–shift, does not 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 symptoms.
D Position Full Open
P
R
N
D
2
L
AT2818 002494
ROAD TEST
NOTICE: Do the test at normal A/T fluid operating temp.
50–80°C (122 – 176°F).
1. D POSITION TEST (NORM PATTERN)
Shift into the D position and keep the accelerator pedal
constant at the full throttle valve opening position, and check
the following points:
(a) Check up–shift operation.
Check that 1–2, 2–3 and 3–O/D up–shift takes place, at the
shift point shown in the automatic shift schedule.
(See page AT1–96)
HINT:
(1) O/D Gear Up–shift Prohibition Control.
• Coolant temp. is 60°C (140°F) or less.
• If there is a 10 km/h (6 mph) difference between the set
cruise control speed and
• vehicle speed.
• O/D main switch is pushed ON.
• (During O/D OFF, indicator light lights up.)
(2) O/D Gear Lock–up Prohibition Control.
• Brake pedal is depressed.
• Coolant temp. is 60°C (140°F) or less.
(b) Check for shift shock and slip.
Check for shock and slip at the 1–2, 2–3 and 3–O/ D up–
shifts.
D Position
P
R
N
D
2
L
1⇒2
2⇒3
3⇒O/D
Slippage?
Shock?
AT3068 002495
D Position Abnormal Noise?
Vibration?
P
R
N
D
2
L
O/D
LOCK-UP
AT3068 002496
(c) Check for abnormal noise and vibration.
Run at the D position lock–up or O/D gear and check for ab-
normal noise and vibration.
HINT: The check for the cause of abnormal noise and vibra-
tion must be performed very thoroughly as it could also be
due to loss of balance in the torque converter clutch, etc.
