kickdown NISSAN 300ZX 1984 Z31 Automatic Transmission Workshop Manual

DESCRIPTION OF E4N71B
I
The Model E4N71B automatic transmission is the
latest addition to Niaan's lineup
of transmissions.
This transmission
is based on the model L4N71B
(mounted on the 1983 model 810), and can pro-
vide lockup of
all forward speeds (1st to 4th speed)
by electronic control.
By use of a microcomputer, the electronic-control-
led lockup system permits lockup of
all forward
speeds (1st to 4th speed)
Either shifting pattern ("standard" or "power")
is
automatically selected by programs set in the
lockup control unit depending on the speed
at
which the accelerator pedal is depressed These
programs are
set in response to the vehicle speed
and throttle position
rlnhibitor switch \Lockup control unit
/;?\I!
LPower Shift switch and mdtcator
Stop lamp rwlrch
\Kickdown switch
Downshift solenoid
Shift switch and low temperature sensor
Throttle valve rwitchl 0 indicator
Lockup solenoid 0 D cancel solenoid
SAT7M
AT-2

ON-VEHICLE SERVICE
Contrl
1. Drain fluid by removing oil pan.
2. Remove kickdown solenoid and vacuum dia
phragm
23 rod
Be careful not to lose vacuum rod.
Vacuum diaphragm
SAT506
3. Remove control valve assembly.
Be careful not to drop manual valve out of valve
body.
4. Disassemble, inspect and assemble control valve
assembly Refer to Control Valve Body.
5. Install control valve assembly.
0 Set manual shaft at Neutral, then align manual
plate with groove in manual valve of control
valve assembly.
Securing bolts come
in 3 different lengths. 0
1 40 mm I1 51 in) 2 35 mm (1 38 in1 3 25mm1098mI
After installing control valve to transmission
case, make sure that control lever can be
moved to all positions.
6 Install kickdown solenoid and vacuum dia-
phragm
& rod.
Make sure that vacuum diaphragm rod does not
interfere with side plate
of control valve.
AT-I 0

ON-VEHICLE SERVICE
Kickdown Switch Adjustment
When the pedal is fully depressed, a click can be
heard just before the pedal bottoms out
If the
click
is not heard, loosen the locknut and extend
the switch until the pedal lever makes contact with
the switch and the switch clicks
Kickdown switch 7
F$i& Downshift solenold
qi& Downshift solenold
SAT719
Do not allow the switch to make contact too soon.
This would cause the transmission to downshift on
part throttle.
DIAGNOSIS:
Switch can be heard clicking, and the transmission
still does not kickdown:
Check the continuity of the switch.
Also check for
available current.
The vehicle upshifts
at approximately 55 (1st to
2nd) and
90 kmlh (2nd to 3rd) (34 and 56 MPH)
only The kickdown switch may be internally
shorted (When the switch
is shorted, there IS con-
tinuity through the switch in any position).
AT-I 5

TROUBLE-SHOOTING AND DIAGNOSES
Vehicle speed
Gearshift krn/h (MPH)
Road Testing (Cont'd)
I
Propeller shaft Line pressure
revolution rprn kPa (kg/cm2, psi)
VEHICLE SPEED AND LINE PRESSURE
WHEN SHIFTING GEARS
E4N71B
VG3OE engine without turbo
1 Disconnect harness from lock-up control unit.
D4 +D3
D3 + D2
Dz + Di
Road test the vehicle to determine if all items
listed in the following chart are within their
specified values
2. Reconnect harness to lock-up control unit
Road test the vehicle to
see if shifting corre-
sponds to the specified
shift schedule pattern
490.647 (5 0- 66,71.94)
490 -902 (5
0 -92,71 - 131)
25.41 (16.25) 800 .1,300
14 .30 (9 - 19)
11
- 19 (7- 12)
450.950
350.600
Intake manifold vacuum
kPa (mrnHg, inHg)
I 1 785 - 941 (8 0.9 6, 114.137) DI+D2 1 59-67(37-42)
Dz + Da
1,900 - 2,150
3,250
- 3,500 101 . 109 (63 - 68) I
0 (0.0)
(Kickdown) ~-
1 745-902(76-92.108-131) 03 +& I 89 - 97 (55 - 60) 2,850 - 3,100
D2
+ Di 42.50 (26 -31) 1,350 - 1,600
12.22 (7. 14)
47 .59 (29 - 37)
67 .83 (42 - 52)
549.706 (5.6 - 7 2.80 - 102)
400 - 700
1,500
- 1,900
2.150.2.650
-13 3 (-100, -3 94)
0 (0.0)
(Full throttle) I 42-50(26-31) I 1,350.1,600 I 726 -883 (7 4.90,105 - 128) 12 + 11
-40 0 (-300, -1 1 81) 12+11 I 39-47(24-29) I 1,250-1.500 I 637-785(65-80.92-114)
VG30E turbo engine
Intake manifold vacuum
kPa (mmHg, inHg) Gearshift Vehicle speed
km/h (MPH)
60 - 70 I37 - 43)
103
- 112 (64 - 70)
-
-
85 - 94 (53 - 58)
46
- 55 (29 - 34)
Propeller shaft
revolution rpm
1,850.2.150
3,150
- 3,450
-
-
-
2,600 - 2,900
1.400- 1,700
Line pressure
kPa (kg/crnz, psi1
1 637.863 (6.5 - 8 8,92 - 125)
-
-
1 637.863 (6 5 - 8 8,92. 125)
+46 7 (+350, +13.78)
(Kickdown)
500.800
650
- 1,050
1,250
- 1,750
650
- 1,150
350 - 850
350.600
1,400
. 1,700
-
16-26(10-16)
21-34(13-21)
41
- 57 (25.35)
21-37(13-23) 1
1 - 28 (7 - 17)
11
- 20 (7 - 12)
46.55 (29 - 34)
314 -471 (3 2 -48.46-68)
314 - 530 (3.2.5 4.46.77)
-26 7 (-200, -7 87)
+46 7 (+350, +13 78)
(Full throttle) 588 - 745 (6.0.7 6,85 - 108)
-60 0 (-450. -17 72) 44 - 54 (27 - 34) 1,350 - 1,650 588 - 745 (6 0 - 7 6.85 - 108)
AT-65

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 Lock-up Control (Cont'd)
INSPECTION POINTS
Inspection
No
1
2
3
4
5
Item to be checked
Lock-up signals
Wires for output signals
Lock-up solenoid
Wires for input signals
hut sianals
Checking method
e Connect tester to control unit connector terminals, Nos 2
and 22 and check lock-up signals while running vehicle
Proper indication
OV if lock-up solenoid is on
12V if lockup solenoid
is off
Check if connector between control unit and lock-up solenoid is
properly connected Also. check connector for continuity.
e Check if O-ring is installed to tip of solenoid
e Check operation of solenoid by applying 12V voltage
Check if connections are properly made between control unit
and following sensors Also. check connectors for conduction
Throttle sensor (Idle. high-throttle side)
e Inhibitor switch (2 range)
Shift switches (1-2.2-3 and 3-4)
Low-temperature sensor
e Kickdown switch
e Vehicle speed sensor
e 0 D switch
Check item given on inspection4 in flow chart on pages AT-75 and 76
AT-78

TROUBLE-SHOOTING AND DIAGNOSES
Inspection of O.D. Control
OK operates normally
Running test1
AIT is defective
(Case 0)
END OK
@ Check if 0 D is not released when power shift switch
@ Check if 0 D is not released in full throttle condition
is turned on
NG witch OK
N.G +
( Is power shift switch normal,) I ,
0. K
Check if 0 D cancel sole-
noid connector
is properly
connected and functions
normally
Replace solenoid
I
/Check if control unit connector
IS properly connected
Check
if connector is soaked
with water
I (Inspection-2)
NG OK
INSPECTION POINTS
Qlecking method Inspection
No Item to be checked
'I 0 D solenoid Turn on key and set 0 D switch to "0 D release" position to see
if 0 D solenoid clicks I I
Inspect following items given in flow chart on pages AT-75 and 76
Shift switches (1-2, 2-3 and 34)
Input signals 21
0 Vehicle speed sensor
0 Lowtemperature sensor
0 Full throttle contact switch
Kickdown switch
AT-79

TROUBLE-SHOOTING AND DIAGNOSES
Inspection of Kickdown Control
I Running test I
signals normal? signals normal? wiring normal?
Replace contrul
(I nspection-3)
good condition?
Repair harness
switch
I
Repair wires
(Inspection-5)
Check if downshift
solenoid functions
properly
Replace
in A/T I I
INSPECTION PO I NTS ~~
~
Inspection No Item to be checked Checking method
Listen for a “click“to be emitted by downshift solenoid
when accelerator pedal
is fully depressed and ignition switch
is “ON“
Downshift solenoid signals
I 1 Connect tester to connector terminals, Nus 21 and 22, of lock-
up control unit Measure while operating accelerator pedal
I Full-open accelerator OV 2 I Kickdown switch signals
Less than full open 5V
Check connector between kickdown switch and control unit
for moper connection and continuitv 3 1 Wires for kickdown switch
4 I Input signal wiring Check connector between downshift solenoid and control
unit for proper connection and continuity
Apply 12V voltage to solenoid proper to see if it functions
normally Downshift solenoid 5
AT-89