1998 NISSAN GT-R brake sensor

ANTI-LOCK BRAKE SYSTEM
Self-diagnosis (Cont'd)
MALFUNCTION CODEISYMPTOM CHART
Malfunction code No. Malfunctioning
part ABS warning
lamp
ON
Fail-safe
operation
18 1 Different number of teeth of sensor rotors 1010
2 1
26 I Front left wheel sensor (short-circuiQ.4 1010
- --
22
25
3 1 I Rear wheel sensor (open-circuit) 1010
Front right wheel sensor (open-circuit)
32 Rear wheel sensor (short-circuit)'4 1 0 1 0
Front right wheel sensor (short-circuit)'4
Front left wheel sensor (open-circuit)
41
I Front right outlet ABS solenoid valve and circuit 1010
0 0
0
0
0
0
- -
42
-- - -
46 Front left inlet ABS solenoid valve and circuit 0 1 0
45 Front
left outlet ABS solenoid valve and circuit
55
1 Rear outlet ABS solenoid valve and circuit 1010
Front right inlet ABS solenoid valve and circuit
56
1 Rear inlet ABS solenoid valve and circuit 1010
0
57 1 Power supply (Low or high voltage)*2 I 0 I -'I
0
0
0
I At self-diagno- ( ABS control unit or data link connector for CONSULT is poorly 1 I
61
63
At self-diagno-
I ABS control unit
sis only
ABS
actuator motor or motor relayg3
ABS
actuator relay
No indication
I I ABS control unit1ABS actuator relay is stuck to OFFJABS I Stays ON power supply circuit, ABS actuator relay drive side power sup-
lgnition switch
ply (coil side) circuit, and ABS warning lamp circuit are
short-
circuited./ABS control unit connector is disconnected or poorly
0
0
I
sis only
Ignition switch
ON
I I connected. I I
0
0
connected.
ABS control
unit1Fuse is blown or ABS warning lamp has an
open circuit.
- -- '1: Fail-safe operation does not activate. A signal from ABS control unit suspends ABS control operation. Brakes operate con-
ventionally. After specified power supply voltage resumes, ABS warning lamp goes out, allowing for ABS control operation. '2: The code No. does not indicate a malfunction related to the ABS control unit. Do not replace the ABS control unit even if the code No. appears. '3: The code No. can sometimes appear when the ABS motor ground circuit is loose or disconnected. When it appears, always
check the ground circuit for improper installation.
'4: ABS warning lamp turns on if a wheel or wheels spin for 10 to 80 seconds (depending on the wheel speed) with the vehicle
stuck in snow, ice, or mud. This is a normal condition. After repairing short-circuited sensor, turning ignition switch ON lights
up
ABS warning lamp. Check that ABS warning lamp turns off when the vehicle is driven at approx. 30 krnlh for approx. 1 minute as shown in the self-diagnosis procedure.

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.

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

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
Self-diagnosis for TCS/ABS Control Unit
control System (Cont'd)
Example: Code No. 25 Front left wheel sensor (open-circutt)
lnd~cat~on
start Start code No.
12
HOW TO ERASE SELF-DIAGNOSTIC RESULTS
(Malfunction codes)
1. Turn the ianition switch "ON" and start the engine.
ABS warnlng lamp - ON
ABS warning lamp
OFF
2. Drive the iehicle at approx. 30 km/h for appfox. 1 minute to
check that there
is no other malfunction.
3. Stop the vehicle and turn the ignition switch "OFF'. I88
4. Ground the self-diagnostic check terminal 4 on the data link
connector for CONSULT.
5. Turn the ignition switch "ONn to start the self-diagnostic results /,%@A
mode.
I---------- -------------- -?-I 3 06 0.9 03C303 3 3 06 3.6 06 09 030303030303030303
Unit: seconds BRG1185D
Tens drglts Units drgits Code No. 25
I -----l
7. Under the self-diagnostic results mode, the malfunction
memory erase mode starts when the check terminal
is discon-
nected from the ground.
8. Ground the check terminal 3 times or more in succession
-.
self-d~agnosts complete
SLlP ndicator lamp i
I ON r
f OFF - c 4 i
ground J Erase -- - - - - - - - - -i - - - - ---f2.i geconds-- - - - - - - .. t mode
Malfunct~on
memory
Malfunct~on
memory
IS erase mode starts. 1s erased. BRZOO~~D
within 12.5 seconds after the erase mode starts. (Each ground-
ing must be
2 seconds or longer.)
9. Disconnect the grounding cable from the check terminal to
erase the malfunction memory and complete the
self-diagno-
-----
CAUTION:
Keep terminal 4 grounded during self-diagnosis. Do not EL
depress the brake pedal during self-diagnosis. Do not start the
engine.
6. The SLIP indicator lamp starts blinking to indicate the malfunc- SD
tion code No. 3 or 4 seconds after the self-diagnostic results
mode is started.
The indication terminates after 5 minutes. Turning the igni-
tion switch from
"OFF" to "ON" resumes blinking the indi-
cation. During the SLlP indicator lamp operation shown
above,
TCS OFF indicator lamp and ABS warning lamp are
lit.
sis.
10. Rerun the self-diagnostic results mode to verify that the mal-
function codes have been erased.
0 When the malfunction codes have been erased, the start
code No.
12 is only indicated.
11. Disconnect the check terminal from the ground. The self-diag-
nostic results mode is now complete.
12. Drive vehicle at approx. 30 kdh for approx. 1 minute, and then
check that the
TCS OFF indicator lamp, the SLlP indicator
lamp
and the ABS warning lamp are OFF.
13. Turn the ignition switch "OFF.

TCS/ABS SYSTEM
Self-diagnosis for TCSfABS Control Unit
Control System (Cont'd)
MALFUNCTION CODE/SYMPTOM CHART I I I
75, 'I:
'2: '3: '4:
'5:
Fail-safe operation is not activated. A signal from control unit suspends TCS and ABS control operation. Brakes operate
conventionally and the vehicle operates in the same manner as a vehicle without the TCS. After specified battery voltage
resumes, the TCS
OFF indicator lamp and the ABS warning lamp go off, allowing for TCS and ABS control operation.
TCS operation only stops and fail-safe operation is activated, allowing for ABS control operation.
Malfunction is detected only when TCS is in operation.
When there are malfunctions in the self-diagnostic check terminal circuit (terminal
4 of the data link connector for CONSULT)
and SLlP indicator lamp circuit, fail-safe operation is not activated.
Some malfunctions in the
TCS/ABS
control unit cause the SLlP indicator lamp and the
ABS warning lamp to go off sepa-
rately.
Malfunc-
tion code
No.
12
21 22
25
26
31
32
35
36
41
42
45
46
55
56
57
58
61
63
71
75
80
83
84
85
86
NO indi-
cation
(no blink-
ing)
NOTE:
When the
80, 83,
84, 85 or 86 is indicated, perform the self-diaqnosis for ECM-TCM or ECM.
Check
item
Normal
Front right wheel sensor (open-circuit)
Front right wheel sensor (short-circuit)
Front left wheel sensor (open-circuit)
Front left wheel sensor (short-circuit)
Rear right wheel sensor (open-circuit)
Rear right wheel sensor (short-circuit)
Rear left wheel sensor (open-circuit)
Rear left wheel sensor (short-circuit)
Front right outlet solenoid valve and circuit
Front right inlet solenoid valve and circuit
Front left outlet solenoid valve and circuit
Front left inlet solenoid valve and circuit
Rear outlet solenoid valve and circuit
Rear right inlet solenoid valve and circuit
Battery voltage (low)
Throttle control unit system or circuit for the corn-
munication
line between TCSIABS control unit
and
throttle control unit
Actuator motor and motor relay circuit
Actuator relay circuit
TCSIABS
control
unit
Total control signal (multiple signal) for engine,
IVT
and TCS/ABS
Engine speed signal
Monitoring of total control signal (multiple signal) for
engine,
AfT and TCS/ABS
Engine system component fuel condition
Incomplete start process of total control signal (mul-
tiple signal) for engine,
AfT and TCSIABS
Continuous start process of total control signal
(multiple signal) for engine, and
TCS/ABS
Remains OFF: Data link connector circuit
Remains ON: SLIP indicator lamp circuit shorted,
TCSIABS
control unit or self-diagnostic check termi-
nal circuit open
malfunction code No. 58 is indicated, perform the Detection
Engine
running
-
0 -
0
-
0 -
0 -
0
0
0
0
0
0
0
0
0
0
0
0
-
0
0
0
0
0
0
throttle control time
In driving
-
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 -
0'3
0
0
0
0
0
0
unit
a Fail-safe
operation
-
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-'I
0
0
0
0
0
0
0
0
0
0
-'4
-'4
code Nos.
ABS
-
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-*2
0
0
05
-
-
-
-
-
-
-
0
self-diagnosis. Lamp
ON
TCS OFF
-
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-
0
When the SLlP
-
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0'5
0
0
0
0
0
0
-
0
malfunction

ELECTRIC SUPER HICAS
Control
Unit Input/Output Signal Specifications
USING CIRCUIT TESTER
Terminal No.
Check item Specification
When control unit is disconnected
: Continuity exists.
Control unit ground circuit
Motor driving output signal
When ignition switch is
ON : Power supply voltage
(In fail-safe mode
: OV)
Motor voltage
When vehicle speed is
0 krn/h : Approx. 4.4 - 6.6V
When vehicle speed is
100 km/h : Approx. 2.4 - 3.6V EPS solenoid driving signal
Battery voltage
I Power supply voltage
Data link connector for CONSULT
(TX) I -
Engine speed signal Measure
tachometer driving signal.
Refer to EC section YECM (TCM) Input/Output Signal
Reference
Value7
.
When ignition switch is ON : Power supply voltage
When ignition switch is OFF
: OV Ignition voltage
Body
/ ground HlCAS waming
lamp When HlCAS warning
lamp is ON
: Approx. OV
When
HlCAS
warning
lamp
is
OFF : Approx. 12V
When ignition switch is ON : Approx. 12V
(In fail-safe mode : Approx. OV)
Output
signal for driving motor relay
Data link connector for CONSULT
(RX) I -
Stop lamp switch signal
(Send brake pedal operation signal to control unit.) When
pedal is depressed : Power supply voltage
When
pedal is not depressed
: OV
Continuity exists.
v Steering angle sensor 2
Steering angle sensor 1
Body
ground When steering wheel
is turned, the voltage changes
between 0 and 5V.
Ground
circuit for rear steering angle sensor
Output signal of rear steering angle sensor
I When neutral : Approx. 2.4V
-
Neutral signal of rear steering angle sensor
When ignition switch is ON
When ignition switch is
OFF
--
When neutral : Appro~. 5V
: Approx. 5V
: Approx. OV Power supply for rear steering angle sensor

ELECTRIC SUPER HlCAS
Control Unit
Input/Output Signal Specifications
(Cont'd)
USING CONSULT
The displayed output signals represent the control unit com-
puted data. If the output circuit (harness) should
be open,
correct values may be displayed.
Monitor item
VHCL SPEED SE
[km/hj
STOP LAMP SW
[ON-OFF] Data monitor
I Condition
Specification
--
STEERING ANG Steering
wheel is turned right Steering angle (degrees) mea-
[R/Ll or left. sured from neutral position
NEUTRAL SIG Steering wheel is in neutral When neutral: ON
[ON-OFF] position
or turned right or left. When
turned (right or left): OFF
Brake pedal operation Check
item
Vehicle is running or driving
wheels are turning.
Steering angle sensor circuit
Approximately
equal to speed-
ometer reading
When pedal is depressed: ON
When pedal is not depressed:
I OFF
In neutral position:
Approx.
2.4V Vehicle
speed sensor circuit
Stop lamp switch circuit
ENGINE SPEED
[r~ml
1"l I Actuator is operating in active I In right lock position:
test. Engine
is running.
Approx. 4.4V
in left lock position:
Approx.
0.4V
Rear steering angle sensing
system
Approximately
equal to tachom-
eter reading
POWER STR SOL
[A1
Wiring
in ECM-HICAS control
unit
MOTOR CURRENT
PI
Vehicle speed is changed from
0 to 100 krnh.
HlCAS RELAY
[ON-OFF]
FAILSAFE
[ON-OFF] At
0 km/h:
Approx. 1.1 0A
At
100 krn/h: Approx. 0.48A
WARNING LAMP
[ON-OFF] System related to power steer-
ing solenoid output signal
RR ST
ANG-VOL
[Vl
MOTOR VOLTAGE
[vl
Actuator is operating in active
test.
Ignition switch is ON or engine
is running.
I Power supply system for
OK
if output current is detected
during operation Motor
and its power supply
system
1 signal from control unit
When ignition
switch is ON: ON
Not in operation HICAS
motor relay
System related to relay driving
Check malfunctioning parts
using self-diagnosis and data
monitor.
Approx.
5V
When warning lamp is ON: ON
When warning lamp is OFF:
OFF
Rear steering angle sensing
system Warning
lamp circuit
Power supply voltage Motor power
supply system
C/U
VOLTAGE
[VI Control unit power supply cir-
cuit
Ignition
switch is ON or engine
is running. Power
supply voltage