1998 NISSAN GT-R automatic transmission

CONSULT CHECKING SYSTEM
Function and System Application
Diagnostic test mode
Work support
Self-diagnostic results
Trouble diagnostic record Function
This mode enables a technician to adjust some devices faster
and more accurately by following the indications on CONSULT.
ECU discriminated
No.
Data monitor
I I whether each system is "OK" or 'NG". lxH-1-
Conducted by CONSULT instead of a technician to determine
Function test Self-diagnostic
results can be read and erased quickly.
Current self-diagnostic results and all trouble diagnostic records
previously stored can be read.
Active test
ECM part number
L x: Applicable ENGINE
x
Classification
number of a replacement ECU can be read to pre-
vent an incorrect ECU from being installed.
InputIOutput data in the ECM can be read.
Lithium Battery Replacement
x
Diagnostic Test Mode in which CONSULT drives some actuators
apart from the
ECMs and also shifts some parameters
in a
specified range.
ECM part number can be read.
CONSULT contains a lithium battery. When replacing the battery obey the following:
WARNING:
Replace the lithium battery with SANYO Electric Co., Ltd.,
CR2032 only. Use of another battery may
present
a risk of fire or explosion. The battery may present a fire or chemical burn hazard if mistreated.
Do not recharge, disassemble or dispose of in fire.
Keep the battery out of reach of children and discard used battery conforming to the local regulations.
AfT
-
-
x
Checking Equipment
x
-
x
x
When ordering the below equipment, contact your NlSSAN distributor. Air
bag
-
-
-
x
!
Tool name ABS
-
x
X
-
x
NISSAN CONSULT
@ CONSULT unit
and accessories
@ Program card
UE990: For Automatic
transmission of
Dual
rnatic M-ATx
EE980: Except for Auto-
matic transmission
of Dual
matic
M-Atx
x
-
--
X
-
Description
-
x
-
-
x
x

IDENTIFICATION INFORMATION
Model Variation
Model
Body Grade Engine Transmission Rear differential carrier
RH drive
GGKBRTFR34UDA FS5R30A
2-door 25GT TURBO
RB25DET
. R200V
GGKBRTAR34UDA
RE4RO1
B
RB20DE
GGHAREARMEDA
1 GGKAREFRMEDA 1 RB25DE
GGKAREARMEDA
GGKBRTFRMUDA
25GT TURBO
RB25DET R200V
GGKBRTARMUDA
RE4RO1 B
BGHAREFR34EDA FS5W71 C
20GT
RB20DE
BGHAREARMEDA RE4RO1 B R200
i%
I
BGKBRTFR34UDA FS5R30A $#i 25GT TURBO RB25DET
R200V
BGKBRTAR34UDA RE4RO1 B
Prefix and suffix designations:
A: Standard
- 1 TEG, TDestlon' U: intercooler turbocharger
Model
F:
&speed
manual transmission
A: 4-speed automatic transmission
20GT,
25GT,
25GT-X T: 25GT TURBO
k: Right-hand drive
2WD B: 2WD
+ ELECTRIC SUPER HlCAS
GH:
RB20DE
GK:
RB25DE, RB25DET
4-door Sedan G: 2-door Coupe

AUTOMATIC TRANSMISSION
SECTION
AT
CONTENTS
SHIFT LOCK SYSTEM .................................................... 2
Component Parts Location .......................................... 2
Shift Lock Circuit Diagram ........................................... 2
Reverse Buzzer Circuit Diagram ................................. 2
TROUBLE DIAGNOSES ................................................. 3
System Description .................................................... ..3
Fail-safe Function ...................................................... ..3
................... Shift Mechanism ............. .........,,.............. .5
Clutch and Band Chart ................................................ 6
Component Parts Location .......................................... 7
........................................................... Circuit Diagram .8
Control Unit Input/Output Signal Specifications ....... .I0
Shift Pattern .............................................................. 1 3
............................................................ Shift Schedule 15
....................................................... Basic Inspection. -16
Line Pressure Test ..................................................... 16
................................................................... Stall Test 17
.................................................................. CONSULT 9
.......................................................... Self-diagnosis ..23
Symptom Chart. ........................................................ -25

TROUBLE DIAGNOSES
Clutch and Band Chart
U0.C
(Low one-
way
clutchl L&R/B
(Low and
reverse
brake)
F/O C
(Forward
clutch)
.
Remarks
PARK POSI-
TION
REVERSE POSITION
O/C
(Overrun
clutch)
*I@
'I@
'18
@
NEUTRAL
POSITION
*"
c'utch)
0
0
WC
clutch)
(Reverse
0
P
R
N
Automatic shift
0
0
FIC
(For-
ward
clutch)
0
0
0
69
0
Band servo
'4
2 Automatic shift
1 st
2nd
-3rd 4th
1 st
1. Locked in 1st
-
4th apply
0
2nd apply
0
'263
*3@
2nd
I st
2nd
0
0
0
DUAL MATIC M-ATx
3rd release
0
8
0
0
0
--
fi In Band servo I FI0.C / UOC I L&WB I
(Reverse clutch) FIC (For- WC (High
ward
clutch) clutch)
PARK POSI-
TION
REVERSE POSITION
NEUTRAL POSITION
@ 0 . . Automatic shift
0 '269 8 - -
-38 8 0
@
G3 0 Automatic shift
10 I I Automatic shift
I I I I I I I
:ch is being set in "OFF position. (D, shift is inhibited.) '2: oil pressure is applied to both 2nd "apply" side and 3rd "releasen side of band servo piston. However, brake band does not contract because oil pressure area on the "releasen side is greater than that on the "apply" side. '3: Oil pressure is applied to 4th "apply" side in condition '2 above, and brake band contracts. '4: A/T will not shift to 4th when overdrive control switch is set in "OFF position.
* 1 : O~erate when control
swil
0: Operates. a: Operates
during "progressive" acceleration.
@: Operates but does not affect power transmission. @: Operates when throttle opening is less than specification, but does not affect engine brake. fi: O~erates when throttle opening is less than specification, activating engine brake.

TCSIABS SYSTEM
System
Description
ABS FUNCTION
During ABS operation, the brake pedal pulsates along with a mechanical noise. This ensures that the ABS
is working properly. mP
When starting up the engine or immediately after the vehicle starts to run, the brake pedal pulsates and G'
a motor noise from the engine compartment can be heard. They are caused by the ABS operation check
and should not be considered abnormal.
A vehicle with the ABS may stop in a longer distance than a vehicle without the ABS when the brake is
EC
applied on a bad road, gravel road, or deep fresh snow.
TCS FUNCTION
TCS/ABS control unit monitors the speed of the driving wheels through 4 wheel speed sensors. If driving
wheel slip is detected, fuel to the engine is cut
ol
and the throttle valve is adjusted so that the engine
a
torque is reduced. On vehicles with automatic transmission, transmission shift schedule is also changed
to control the rear wheel driving torque, which results
in the reduction of wheel slip. This system enables
the throttle valve to be controlled so that optimum engine torque can be achieved in accordance with the
driver's acceleration request.
The driver may not feel satisfied with acceleration on some road surfaces. This poor acceleration occurs
because the operating TCS gives priority to maintaining optimum traction. Therefore, this condition should
R8
be considered normal.
When shiftdown is made or the acceleration pedal is depressed while the vehicle is driven on the road
surface that has different friction coefficients, the TCS may operate temporarily.
r-- 4 Lrd[-i
On vehicles with manual transmission, the SLlP indicator lamp and the TCS OFF indicator lamp may light
up when the engine is about to stall in the conditions shown below.
If the lamps go off when engine speed
increases, there is no problem in the system.
At start, the engine almost stalls and the engine speed is much lower than the idle speed.
The vehicle is driven at an extremely low speed with a high-speed gear engaged.
The clutch has been engaged until the vehicle almost stops. 8D
FAIL-SAFE FUNCTION
ABS system
If any malfunction is detected in the system, the ABS warning lamp, the TCS OFF indicator lamp and the SLlP
indicator lamp in the instrument panel is turned on with the TCSIABS deactivated and the vehicle's brake sys-
tem reverts to normal operation.
TCS system
If any malfunction is detected in the system, both the SLlP indicator lamp and the TCS indicator lamp on the
instrument panel light up and the TCS is shut down. The vehicle operates in the same manner as a vehicle
without the
TCS, while the ABS is operational.
If there is a malfunction in the throttle control system, the TCS becomes inoperative while the ABS
remains functional.
When fail-safe operation is activated, perform the self-diagnosis procedure for the TCSIABS first.
Refer to
BR-27 for details.

SERVICE DATA
SECTION SD
CONTENTS
L ] RB20DE (UB) [I 17 FS5R30A 1-
ENGINE MECHANICAL ............................................... 2 MANUAL TRANSMISSION ........................................... 10
-1 RB25DE /I
ENGINE MECHANICAL .................................................. 4
17 RB25DET I]
ENGINE MECHANICAL .................................................. 6
CLUTCH.. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . . . . . . . .. . . . .+.. . . . . . . . . . -8
71 FS5W71C
MANUAL TRANSMISSION
.................... ......................... 9
AUTOMATIC TRANSMISSION ........................... .......... 12
TRANSFER .............. ......... ..... .. ... ........ . . ............. 18
PROPELLER SHAFT ................................................. 19
FRONT FINAL DRIVE ................................................. 20
REAR FINAL DRIVE ..................................................... 22
DRIVE SHAFT ............................................................... 24
AXLE & SUSPENSION ................................................. 25
ROAD WHEEL AND TIRE ............................................. 27
BRAKE. ... ...... . .. ... . .... . . . . . .... . .. .. . . .. . . .. . . . .. . . .. ... .. .. . . . . . . . . .. .... . -28
STEERING ........... ............. ..... ... ............... ...... ................ 29
SUPER HICAS ............................................................ 30

AUTOMATIC TRANSMISSION
LOCK-UP SPEED
Engine type (mode
Vehicle speed in
D, position
Vehicle speed in
D, position code)
Lock-up OFF krnh
Lock-up
ON
kmlh
Lock-up OFF kmlh Closed throttle
Half throttle
Closed throttle
Half throttle
Closed throttle Half throttle
Closed throttle Half throttle
--- - Closed throttle: Throttle opening of less than 118 with the closed throttle position switch off position
Half throttle: Throttle opening of 418
STALL SPEED
LINE PRESSURE
Engine type (model code) Stall engine speed rpm
- - -
At idle engine speed I 0.58 - 0.62 (5.9 - 6.3) I 0.47 - 0.51 (4.8 - 5.2)
Engine speed
At stall engine speed
1 1.71 - 1.78 (17.4 - 18.2) 1 1.22 - 1.29 (12.4 - 13.2)
Line pressure MPa (kg/cm2)
R position D, 2, and 1 positions (4AT)
D, 3, and 2 positions (M-AT)

AUTOMATIC TRANSMISSION
ACCUMULATOR
Accumulator spring
Spring designation
Accumulator spring
A
Accumulator spring D
BAND SERVO PISTON
Band servo piston spring
--
Free length mm
43.0
66.0
45.0
Accumulator spring B
-
- --
Parts number
31 605 41 X02
31 605 41
XI 0
31 605
4AX03
EC
31 605 4AX00
4AX03
model
Except
4AX03 model
AT
Accumulator O-ring
58.4
Accumulator Large O-ring mm
Small O-ring mm
Accumulator
spring C
31 605 41 X06
Model code
A
45
29
Spring designation
Band servo piston spring
A
Band servo piston spring B
Designation
I Reverse clutch I Hiah clutch
4AX00,4AX01
Band servo piston spring C
Model code I 4AX00 I 4AX01. 4AX03
B
50
45
4AX03
HA
Free length mm
47.6
-
CLUTCH AND BRAKE
29.7
C
50
34
Parts number
31 605 41 XI 4
-
Drive
Piate
D 0 J-J
45
29 ST
31605 41x01
Wear limit mm
Number of plates
Clearance
"7m
1 0.5 - 0.8 I 0.5 - 0.8
Free length mm
47.6
-
Number of plates
Parts number
Thickness mm
1.8 1.8
2 2
Driven plate
Thick- Thick-
I % I Parts number Parts
number
31 605 41 XI 8
- EL
29.7
-- 2 2
31 532 41
x73
31 532 41 X24
2.0 2.0
Parts number
31 605 41 XO1
Parts number
Thickness mm
Thick- ness mm 31 536 41 X20
31536 41x14
2.8 2.0
Thick-
Retaining plate