1998 NISSAN GT-R Service Manual

TCSIABS SYSTEM
System Description (Cont'd)
Parts that make throttle control inoperative
Malfunction code No.
11
12
13
91
32 I
Throttle motor return spring (Return spring is bro-
ken.) Malfunctioning part
Throttle position sensor circuit
Throttle motor sensor circuit Circuit for
the communication line
(DKR line)
between
TCSIABS control unit and throttle control
unit
Actuator system (Motor circuit is open or throttle
L I
22
23
24
Parts that make throttle control operative
motor intermittently works.)
Throttle motor drive system (overcurrent)
Throttle motor relay circuit (shorted)
Throttle motor relay circuit (open)
System Diagram
Secondary throttle posrt~on sensor value - - C; Front nght C CI) - ul wheel sensor , Throttle control unrt 0 - CI, -
$ Rear ngh:
g 5 wheel sensor c 0 m E
000000
Total control stgnal for engrne, AIT and TCS/ABS (multrpie communication)
TCSlABS control unrt
Rear lett
whee! sensor
TCS OFF swtch
Front left
wheei sensor
-+ SLIP 1ndrca:or Lamp '
----c TCS OFF rndcator lamp
c A9S warnlns lamp BR-0227D
Malfunction code No.
31
33
Malfunctioning parts
Starter signal circuit (shorted)
Paridneutral
position switch circuit (open or
shorted)

TCSfABS SYSTEM
Component Parts
Location
[El TCSIABS
Rear wheel sensor
Throttle motor relay
Front right wheel
senso
Throttle control unit
Front left wheel sensor
@ RH side of engine compartment
// /LA~A~~~~
RH side of rear suspension t%ernb&- /
I Rear wheel sensor connector
Engine compartment control unit
-- -- -- -
- - LH side of engine compartment
Behind LH side lower fi

10 SLIP indicator lamp IOA~ I
Throttle
motor relay ABS warnina lam. 1 I Throlllo
motor sensor
Throtlle
~osition sensor ,----------- --- - 7 I I I Actuator motor I
1 L
TCS OFF indicator
Throlllo motor
I angle signal ECM TCM
37 or ECM
TCS switch signal
5 3
4
2
7 6
7
Throttle ClU 20
10
Stop lamp SW u22 & FR OUT 1 1
j To data link
,connector TXL I for {W- l CONSULT I I I I I I
Rear IN
Throllle molor
1 I
& 5 6 7 8 @JgT$@
- - - - - - - - - DKV (Throlllo angle output) 2
ECM.TCM or ECM 2
109 3 Meter CIU (NT model only) 111 3
--------- -- DKR (Ttirotllo niolor (argot : angle signal) ' TO data link I 1 4 connector for I
To Meler CIU (Engine speed signal) 4 1 115
Dala link connector
for CONSULT
Ttlrottle CIU

TCSIABS SYSTEM
Control Unit
InputlOutput Signal Specifications
USING CIRCUIT TESTER
TCS/ABS control unit - -
To perform the following inspection, the ignition switch should be turned ON with TCS/ABS control unit con-
nector and actuator connector properly connected.
I
TCS/ABS contro! unit connector
Terminal No.
P Front right wheel I
Item
sensor
I
Specifications'l
Rear right wheel Wheels are turning (Approx.
30 km/h)'3: Pulse generates.
Front: Approx. 200
Hz
Rear: ADDrox. 200 Hz I . , sensor
Rear left wheel
sensor
I
I
Brake pedal is depressed: Battery voltage (Approx. 12V)
Stop lamp signal Brake pedal is not depressed: Less than approx. 2V
Actuator relay is activated (with engine running): Less than approx.
2V
Actuator relay Actuator relay
is not activated (with fail-safe function activated and engine
not running): Battery voltage (Approx.
12V)
ABS motor is running (in CONSULT active test mode): Battery voltage
ABS motor monitor (Approx. 12V)
ABS motor is stopped (with ignition switch ON): Approx. OV
SLIP
indicator
SLIP
indicator lamp
ON'S: OV
lamp
SLIP
indicator lamp
OFF'5: Battery voltage (Approx. 12V)
TCS OFF indicator TCS OFF indicator lamp
ON'4: OV
lamp TCS OFF indicator lamp
OFF'4: Battery voltage (Approx. 12V)
TCS OFF switch TCS OFF switch is pressed: Approx. OV
signal TCS OFF switch is not pressed: Approx. 4
- 5V
Engine speed sig-
nal Pulse generates.
Refer to EC section
("ECM.TCM Input/Outout Reference Value")
Total control signal
(Multiple communi-
cation) for engine,
A/T and TCSIABS Check item (Refer-
ence)
Wheel sensors
and circuit Stop lamp switch
and circuit
ABS actuator relay
and circuit
ABS motor monitor
circuit
SLlP indicator
lamp and circuit
TCS OFF indicator
lamp and circuit
TCS OFF switch
and circuit
Engine speed sig-
nal circuit
Circuit for total
control signal (Mul-
tiple communica-
tion) for engine, A/T and TCSIABS

TCS/ABS SYSTEM
Control Unit InputlOutput Signal Specifications
(Cont'd)
Terminal No.
Specifications'l
- - --
Check item (Refer-
ence)
- - -
Body
ground
-
Approx. 7V - - or higher Communication
line circuit between
TCSIABS control
unit and throttle
control unit
DKV
(throttle angle
output)
Acceleration pedal is released: approx. 1 ms (reference)
ABS warning lamp ABS warning
lamp
and circuit 4B3 warning lamp 0Nr2: Approx. OV
4BS
warning lamp 0FF72: Battery voltage (Approx. 12V)
cictuator
relay is activated (with engine running): Battery voltage
(Approx.
12V)
ktuator
relay is not activated (with fail-safe function activated and engine
70t
running): Approx.
OV
ABS warning lamp
and circuit,
ABS
actuator relay and
circuit
Actuator relay
monitor
48s
motor is running (in
CONSULT active test mode): Less than approx.
2V
4BS motor is stopped: Battery voltage (Approx. 12V)
TCS is not activated: ABS
motor, motor
relay and circuit
ABS
motor relay
Approx. 7V - -
OV I I Communication
line circuit between TCSfABS control
unit and throttle
control unit
DKR
(throttle
motor target angle
signal) Approx. 9 ms (Reference)
Front
right inlet
solenoid
Front right outlet
solenoid
4ctuator
is activated (in CONSULT active test mode), or actuator relay is
lot
activated (with fail-safe function activated and engine not running):
4pprox.
OV
4ctuator
is not activated and actuator relay is activated (with vehicle
stopped and engine running): Battery voltage (Approx.
12V)
Rear inlet solenoid
Rear outlet
sole- ABS solenoid and
circuit
Front left inlet
solenoid
Front left outlet
solenoid
Battery gnition switch
ON: Baitery voltage
(Approx. 12V) Control
unit power
supply circuit
'1: Do not force to oDen a connector terminal when usina a circuit tester for ins~ection. '2: ABS warning lamp ON: When the ignition switch is t6ned ON (before startirig the engine) or a malfunction is detected
ABS warning lamp OFF: When the engine has started (with the system in normal condition)
'3: Tire pressure must be in accordance with specification. '4: TCS OFF indicator lamp ON: When the ignition switch is turned ON (before starting the engine), a malfunction is detected,
or TCS OFF switch is turned ON TCS OFF indicator lamp OFF: When the engine has started (with the system in normal condition) and the TCS OFF switch
is off '5: SLlP indicator lamp ON: When the ignition switch is turned ON (before starting the engine) or a malfunction is detected
SLlP
indicator lamp OFF: When the engine has started (with the system in normal condition) and the TCS is inoperative

TCS/ABS SYSTEM
Control
Unit InpuVOutput Signal Specifications
(Cont'd)
Throttle control unit
Terminal No.
Specifications*
item Check
item (Refer-
ence)
Throttle angle sig-
nal Ignition switch
ON
Throttle valve is fully closed: Approx.
0.5V
Throttle valve is fully open: Approx.
4.2V
Throttle motor sen-
sor
Throttle motor angle signal Throttle
position
sensor circuit and
ECM
I
Throttle motor sen-
sor and circuit R8 Engine is idling: Approx. 4.4V
I
I Throttle motor
TCS switch signal Engine
is idling: Approx.
3.4V
lgnition switch ON: Approx. 5V
Throttle control
unit power supply angle
signal and
MA
circuit
TCS switch signal
circuit
EL
Body
jround
- - -- -- - - - --
lgnition switch ON: Battery voltage (Approx. 12V)
Throttle control
unit power supply
Throttle motor relay
Sensor battery
voltage
Throttle control
unit power supply
Throttle motor relay Throttle
control
unit power circuit @J
1
Throttle control
unit power circuit
lgnition switch
ON: Battery voltage (Approx.
12V)
Throttle motor relay and circuit
lgnition
switch ON: Approx.
OV
Throttle position
sensor power cir-
cuit
lgnition
switch ON: Approx. 5V
lgnition switch ON: Battery voltage (Approx. 12V) Throttle control
unit power circuit
lgnition switch ON: Battery voltage (Approx. 12V)
I
Throttle motor
relay
and circuit
Start signal lgnition
switch START (Disconnect ECM-TCM connector or ECM connec-
tor.): Approx.
10V
*: Do not force to open a connector terminal when using a circuit tester for inspection. Start
signal circuit
and ECM

TCSlABS SYSTEM
Control Unit InputfOutput Signal Specifications
(Cont'd)
USING CONSULT
Indicated are the controi unit computed data. If the output circuit (harness) should be open or short-
circuited, correct values may be displayed.
TCS/ABS control unit
Display
I Vehicle is stationary.
REVOLUTION SENSOR
W/hI
STOP LAMP SW [ON-OFF] Check
item (Reference)
Data monitor
the
same 'peed Wheel sensor circuit
as speedometer (within
~onttor
ltem
Wheel
speed'l
Vehicle is
driven.'l
Condition
Brake pedal is
Brake pedal is not
depressed.
Engine is stopped.
Engine is running at
more than
400 rpm.
Actuator (solenoid) is
activated (at CONSULT Specifications
Brake pedal status
-1 Engine speed signal cir-
cuit
ENG
RPM SIGNAL
[STOP-RUN] Engine operation
active test), or actuator
relay is not activated
(with fail-safe function
activated and engine not
running). Solenoid circuit
IN
ABS SOLENOID
[ON-OFF]
Solenoid status Actuator (solenoid) is
not
activated and actuator
relay
is activated (with
vehicle stopped and
engine running).
OUT
ABS SOLENOID
[ON-OFF] OFF
Actuator relay is acti-
vated (with engine run-
ning).
ABS ACTUATOR RELAY
[ON-OFF]
- Actuator relay and circuit
Actuator
relay status
Actuator relay is not acti-
vated (with fail-safe
function activated and
engine not running).
Motor relay and motor
are activated (at CON-
SULT active test).
Motor relay and motor
are not activated. OFF
I ABS
motor, motor relay
ABS MOTOR
RELAY
[ON-OFF]
Motor
relay
and motor
status
OFF and circuit
ABS warning lamp cir-
cuit
Controi unit power
sup-
WARNING LAMP
[ON-OFF]
4BS
warning lamp
sta-
:us'2
Warning lamp ON Warning lamp OFF
'ewer supply voltage
~rovided for control unit
BATERY
BOLT [V] Ignition switch ON
Acceleration pedal is not
depressed. (Ignition
switch
ON)
10 - 16V
I
Communication line cir-
cuit between TCS/ABS
control unit and throttle
I - 10096 control unit ply circuit and ground
circuit
rhrottle
angle condition
linked with acceleration
~edal)
THRTL OPENING
[%]
Acceleration pedal is
depressed. (Ignition
switch ON)

TCS/ABS SYSTEM
Control Unit Input/Output Signal Specifications
(Cont'd)
THRTL OPENING TAR-
GET
[%]
Display Monitor item
Motor throttle angle con-
dition
TCS
MODET3
TCS OFF LAMP Data monitor I Condition
Specifications
TCS is inoperative.
TCS is operational.
Communication line
cir-
TCS is inoperative.
Number of cylinders to cuit between
TCS/ABS
which fuel is cut off control unit and
I.z /LT TCS is operational.
ECM-TCM or ECM
GEAR
TCS
SW
TCS OFF indicator lamp
TCS OFF indicator lamp
status
1 1 lEi3FF indicator amp
TCS OFF indicator lamp
@
Check item (Reference)
SLlP LAMP
0%
0 - 100%
Gear selection
TCS OFF switch status (ONIOFF)
P/N POSITION SIGNAL Communication line cir-
@
cuit
between TCSIABS
control unit and throttle
control unit
lzc
SLlP indicator lamp is / ow
TCS OFF switch circuit ST
I
1: 1st gear 2: 2nd gear 3: 3rd gear
4: 4th gear 5: 5th gear
SLIP
indicator lamp
sta-
cuit
TCS switch ON
TCS switch OFF
PNP switch signal or
neutral position switch
signal status (ONIOFF) ON
OFF
SLlP indicator lamp is
ON.
( A/T selector position: I I
I %~hift position: I ON
ON
SLIP indicator lamp cir-
1 Other than Neutral I 1
Neutral
A/T selector position:
Other than N and P
MA' shift position:
A/T PNP switch or neu-
tral position switch circuit
OFF
'1: Tire pressure must be in accordance with specification.
'2: ABS warning lamp ON: When the ignition switch is turned ON (before starting the engine) or a malfunction is detected ABS warning lamp OFF: When the engine has started (with the system in normal condition) '3: TCS mode: 0 - 24, number of cylinders to which fuel is cut off x 4
Throttle control unit
THRTL POS SEN
Display
TH MOTOR VOLT Monitor item I Sensor
voltage (V)
Sensor voltage
(V)
Throttle valve is fully
I Approx. 0.5V closed.
Engine is idling.
I
Data monitor
Approx. 3.4V
Condition
TH OPEN CONT Specifications
Motor throttle target
angle signal (ms)
NEUT
POSl
SW
START
SIGNAL
ONIOFF TCS
is inoperative
Shift (selector) lever is in
parkheutral
position. Approx.
9 ms Check
item (Reference)
ON
1
Throttle position sensor
circuit
ONIOFF Throttle motor sensor
circuit
Communication line cir-
cuit between
TCS/ABS
control unit and throttle
control unit
Start signal circuit
ParWneutral position
switch circuit
Ignition switch
ON
I