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
___
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
TROUBLE-SHOOTING AND DIAGNOSES
Inspection of Parts Related to A. S. C. D. (Cont’d)
INSPECTION POINTS
Inspection No
1
2
3
4
5
6
7
8
Item to be checked
0 D cancel solenoid signals
A S C D cruise signals
AS C D wiring harness
AS C D controller
AS C D 0 D cut signals
AS C D wiring harness
Output signal wiring
0.D cancel solenoid
Checking method
Jack up rear wheels, set lever to D range, and accelerate up to
D4 speed by slightly opening throttle
Then, when vehicle
speed
is 30 to 80 kmlh (19 to 50 MPH), completely close
accelerator and apply brakes over
0 7 second To check if
signals to turn on 0 D cancel solenoid come out at this time,
check item
“0 D cancel solenoid” in chart on page AT-75
1 Connect tester to connector terminals, Nos 13 and 22,
of lock-up control unit
2 Measure by repeatedly releasing vehicle speed setting
during A S C D driving
Proper indication
ASCD isset 12V
AS C
D is released OV
Refer to section EL for A S C D
Refer to section EL for AS C D
1 Connect tester to connector terminals, Nos 15 and 22,
of lock-up control
unit
2 Measure by repeatedly releasing vehicle speed setting
during AS C
D driving in D4 speed
Proper indication
Accelerator pedal is depressed OV
Accelerator pedal
is released 5V
Refer to section ELfor A S C D
Check connector between control unit and 0 D cancel
solenoid for connections and continuity
Apply 12V voltage to solenoid proper to see if it operates
normally
AT-88
