TROUBLE-SHOOTING AND DIAGNOSES
Inspection of Lock-up Control Unit (Cont'd)
Terminal
No
12
13
14
15
16
17
18
19
20
21
22
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Checking inputloutput signal
1-2 shift switch
AS C D cruise signal
- Brake switch
A S C 0 0 D cut signal
3-4 shift switch
2-3 shift switch
Power source
Power shift switch
Low-temperature sensor
Kickdown switch
Ground
Checking method
Jack 'JP rear wheels, set lever to D range,
and
ri easure while accelerating with a
slightly open throttle
Measure by repeatedly releasing vehicle
speed setting during
AS C D driving
Measure while operating brake pedal
Measure by turning on and off
accelerator switch during A S C D
driving at D4 speed
Jack up rear wheels, set lever to D range
range,
and measure while accelerating
with
a slightly open throttle
Make ground connection
Measure while operating power shift
switch
When checking in installed state, refer to
the items on the right Remove sensor
from transmission and make continuity
test
Measure while operating acceleratoi
pedal
Judgment standard
D1 range ov
D2. D3, and 04 ranges
12VifASCD
isset
OV if AS C D is released
5V
Braking condition 12v
Non-braking condition OV
OV if accelerator switch is on
5V
if accelerator switch is
off
D1, D2. and D3 ranges OV
D4 range 5v
D1 and D2 ranges
ov
D3 and D4 ranges 5v
12V
at all times
OV if turned on
12V
if turned off
Continuity test
Zero continuity at 20'c
(68OF) or higher
Continuity
at 10°C (50°F)
or lower
(Reference)
5V
if oil temp is over
20°C (68°F)
OV if oil temp
is below
10°C (5OOF)
Ful I-open accelerator OV
Less than
full open 5v
AT-76
