brakes NISSAN 300ZX 1984 Z31 Automatic Transmission Workshop Manual

TROUBLE-SHOOTING AND DIAGNOSES
Inspection of Downshift Control
Details on each step will be described later.
I Running test
Check if D4 - D3 downshift
control functions normally 0 K
brakes are applied over 0 7 second when running
at 30 to 80 kmlh (19 to 50 MPH) with full-close
throttle
(Inspection-1) 1.
N G 0 D cancel solenoid 0 K
signals normal7
(Inspection-4)
P I
signals normal?
(~nspection-3) 4
Repair wires Check if 0 D cancel sole-
noid
is properly installed
and functions normally.
NG OK
Repair defects
AT-80

TROUBLE-SHOOTING AND DIAGNOSES
Inspection of Downshift Control (Cont‘d)
D3 - D2 downshift control
normal, 0 K END
Downshift from D3 to D2 is, not performed
even
if brakes are applied when running at
30 to 50 km/h (19 to 31 MPH) with full-
close throttle
(Inspection-6) 1
, NG(-G*
signals normal?
(Inspection-9) 4
N G 34 shift switch
wire normal?
1 Inspection-10)
signals normal7
~~nspection-7) 1
signals normal)
‘1
Repair or replace 34
shift switch
Check if downshift solenoid
IS properly installed and
operates normally
corrrctly or replace
AT-81

TROUBLE-SHOOTING AND DIAGNOSES
Inspection of Downshift Control (Cont'd)
INSPECTION POINTS
Inspection
No Item to be checked Checking method
0 Jack up rear wheels, set lever to D range, and accelerate up to
04 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 0 D cancel solenoid signals
Wires for output signals Check connector between control unit and 0 D cancel solenoid
for proper connection and continuity
a Apply 12V voltage to solenoid proper to see if it operates
normally
2
3 0 D cancel solenoid
Wires for input signals
Check if connectors between control unit and sensors are properly
connected and have proper continuity Refer to circuit diagram
on page AT-74
0 Inhibitor switch ("2" range)
0 Shift switches (1.2, 2-3 and 3-41
0 Brake switch
0 Idle contact switch
0 Throttle sensor
0 Vehicle speed sensor
4
5 Input signals Check same items as inspection4 in chart on pages AT-75 and 76
0 Jack up rear wheels, set lever to D range, and accelerate up to
D3 speed by slightly opening throttle Then, when vehicle
speed
is 30 to 50 kmlh (19 to 31 MPH), completely close
accelerator and apply brakes To check
if signals to turn on
downshift solenoid come out
at this time, check items concern-
ing downshift solenoid in chart on page AT-75
6 Downshift and solenoid signals
Check connector between control unit and downshift solenoid
for proper connection and continuity 7 Wires for output signals
Downshift solenoid
___ ~~ ~~~
0 Apply 12V voltage to solenoid proper to see if it operates
normally 8
9 34 shift switch wires Check in same manner as in inspectiond, above
Check in same manner
as in inspection-5, above 10 34 shift switch signals
AT-82

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