1998 NISSAN GT-R relay

TROUBLE DIAGNOS
ECM (.TCM) lnpu
:s
3utput Signal Reference
Value (Cont'd)
.. No.
Fluctuates between approx. 0.1 to
0.4V and approx.
0.7 to
0.9V At
idle
- I I - I I -
I
I
- are measured
At approx. 2,000 rpm
:v: i .5 I .O 0.5 0
ECL 1 8645 11jllllllll ECL 1 8630
Throttle motor sensor
signal
[RB25DET'J Approx. 3.4V
I (Voltage becomes lower when TCS operates.)
Motor throttle switch
signal
[RB25DET]
Approx.
4.7V
Mass air flow sensor
signal
t
(When TCS is operating: Approx. OV)
Ignition switch ON: Approx.
0.2V
At idle: Approx.
1
.I - 1.2V Approx.
1.6 - 1.7V
Mass air flow sensor
ground Approx.
OV
I
Coolant temperature approx. 20°C: Approx. 3.5V
Coolant temperature approx.
80°C: Approx. 1.2V
Approx. 0.36V min.
(Voltage increases as the air conditioner refrigerant
pressure increases.)
Approx. 0.4
- 2V (') ': Voltage varies with measuring range (internal resis-
tame) of a circuit tester.
Battery voltage
C
+
+
+
56
-
62 1 Knock sensor signal 1
Engine coolant tem-
perature sensor signal
57
- -- -
63 1 Knock sensor signal 2
Refrigerant pressure
sensor
67 Control unit power
sup-
72
I PIY Receive (Data input to
control unit) 1
Transmit (Data output
from control unit) CONSULT
connected: Approx. 0.25V
CONSULT
not connected: Battery voltage
CONSULT connected: Approx.
9V max. CONSULT not connected: Approx. OV
C
Fan stopped: Battery voltage
Fan operating: Approx. 0.2 - 0.3V 78
NOTE: Above
Auxiliary electric fan
relay control signal
[RB25DE, RB25Dm
voltages values obtained
analog circuit
tester.

TROUBLE DIAGNOSES
Component Parts Location
[M-AT (Except TCS)]
Control valve uppe:
Line pressure
solenoid Shift solenoid A
Shift solenoid B Overrun clutch
solenoid
Steering switch relay I Ql Shift control unit (Except RB20DE) ?
ATN 1 985D
AT-?

TROUBLE DIAGNOSES
Circuit Diagram (Cont'd)
Data link connector for C0NS;ILT
Engine speed signal -
i? Throttle ~otal controi port&-2 s-2 33 7'' ELM I E - , 10
AT mode SW & '' 19
(2WD)
1- 1 I I Throttle msition sensor
I I Vehicle speed sensor 1
Turbine sensor 38 -
Throttle position SW 2 r I- 16
L TO IGN SW I PNPSW
To starter relay 4-1 34 - 27
A i 26
n I IGN IOA ID OFF 1ND.L AT> I T 22 I Shift CIU
ATN 1 987D

ANTI-LOCK BRAKE SYSTEM
Fail-safe Function
If any malfunction is detected in the system, the ABS warning lamp
in the instrument panel is turned on with the ABS deactivated and
the vehicle's brake system reverts to normal operation.
System Diagram
ABS control uni: Actuator
Front lefl wheel sensor
Rear wheel Sensor Front
right inlet solenoid valve 1 I -
L ' Data ltnk connector
for CONSULT
Front right outlet solenold valve
Front lett rnlet solenoid vJve
Front left cutlet solenoid valve
r i Rear inlet solenold valve
Contrd
circuit I
Rear outlet solenoid valve
-A Motor (motor relay)
-- Actuator relay
Faii-safe
circuit
TrO~ble
diagnos~s
circuit ABS
warning lamp

ANTI-LOCK BRAKE SYSTEM
Circuit Diagram
To combination meter
I Stop lamp SW
I ABS wamlng lamp i
stop lamp 9
Wheel
sensor i connector &
FL
FR
Rea Motor relay
. FIL - 8 30A
I 11: Actuator
relay I
ABS CIU
To data link connector for CONSULT 1 RX "8 - 12
FR OUT SN fm
Rear OUT SN
Rear IN SN
27 10 ABS actuator :
ABS actuator connector
-
ABS CN connector

ANTI-LOCK BRAKE SYSTEM
ABS control unit connector
Terminal No.
Control Unit InputlOutput Signal Specifications
USING CIRCUIT TESTER
To perform the following inspection, the ignition switch should be
turned
ON with ABS control unit connector and actuator connector
properly connected.
Item Specifications*l
Battery Ignition switch ON: Battery voltage (Approx. 12V)
Brake pedal is depressed: Battery voltage (Approx. 12V)
Stop lamp signal
Brake pedal is not depressed: Less than approx.
2V
ABS motor is running
ABS motor relay (in
CONSULT active test mode): Less than approx.
2V
ABS motor is stopped: Battery voltage (Approx.
12V)
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)
Actuator relay is activated (with engine running): Battery voltage (Approx.
Actuator relay 1 2V)
monitor Actuator
relay is not activated (with fail-safe function activated and engine
not running): Approx. OV
Front
right inlet
Actuator is activated (in CONSULT active test mode), or actuator relay is
solenoid not activated (with fail-safe function activated and engine not running):
Rear inlet solenoid Approx. OV
Front
left inlet Actuator
is not activated and actuator relay is activated (with vehicle
solenoid stopped
and engine 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
ABS warning lamp
ON'2:
Approx. OV
ABS warning lamp
ABS warning lamp
OFF'2:
Battery voltage (Approx. 12V)
Front right wheel
sensor Wheels are turning (Approx. 30
krn/h)*3: Pulse generates.
Front: Approx. 200
Hz
sensor
Rear: Approx. 400 Hz
Front right outlet
Actuator is activated (in CONSULT active test mode), or actuator relay is
not activated (with fail-safe function activated and engine not running):
Rear outlet
sole-
Approx. OV
I lUlU / Actuator is not activated and actuator relay is activated (with vehicle Front left Outlet stopped and engine running): Battery voltage (Approx. 12V)
solenoid
'1:e
to
tooen
a connector terminal when
using a circuit tester for inspection. Control
I
unit
power
supply circuit
ST
Stop lamp switch
and circuit
ABS motor, motor
R8
relay and circuit
ABS actuator relay
and circuit
pL
ABS warning lamp
and circuit, ABS
actuator relay
SD monitor circuit
ABS solenoid and
circuit
ABS motor monitor
circuit
ABS warning lamp
and circuit
Wheel sensors and circuit
ABS solenoid and
circuit
'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: One second after the ignition switch is turned ON (with the system in normal condition) *3: Tire pressure must be in accordance with specification.

ANTI-LOCK BRAKE SYSTEM
Control Unit InputfOutput Signal Specifications
(Cont'd)
USING CONSULT
Indicated are the control unit computed data. If the output circuit (harness) should be open or short-
circuited, correct values may be displayed.
Check item (Reference)
Data monitor
Display Condition
Monitor
item
Specifications
Vehicle is stationary.
I 0 kdh
FR RH SENSOR
FR LH SENSOR
RR SENSOR
[kdh]
Virtually the same speed
as speedometer (within
+I 0%)
Wheel sensor and circuit
Wheel speed
Vehicle is
drivem'l
Brake pedal is
depressed. Stop lamp switch and
circuit
STOP
LAMP SW
[ON-OFF] Brake pedal status
Brake pedal is not
depressed. OFF
-- --
Actuator (solenoid)
is
activated (at CONSULT
active test),
or
actuator relay is not
activated (with fail-safe
function activated and
engine not running).
FR
RH IN SOL
FR
LH IN SOL
REAR IN SOL
[ON-OFF]
ABS solenoid and circuit
Solenoid status
FR RH OUT SOL
FR
LH OUT SOL
REAR OUT SOL
[ON-OFF]
-- -- - -- -
Actuator (solenoid) is not
activated and actuator
relay is activated (with
vehicle stopped and
engine running).
Actuator relay is acti-
vated (with engine run-
ning).
Actuator relay is not acti-
vated (with fail-safe
function activated and
engine not running).
ABS actuator relay and
circuit
OFF
ON
OFF
ACTUATOR
RLY
[ON-OFF] Actuator
relay status
Motor relay and motor
are activated (at CON-
SULT active test). ABS
motor, motor relay,
and circuit
MOTOR
RLY
[ON-OFF] Motor
relay and motor
status Motor relay and motor
are not activated. OFF
ABS warning lamp and
circuit
- -
Waming lamp ON'2 1 ON
WARNING LAMP
[ON-OFF] ABS
warning lamp sta-
tus
Power supply voltage
provided for control unit -- -
Warning lamp OFF'2 1 OFF
Control unit power sup-
ply circuit - -
BAlTERY VOLT [V] Ignition switch
ON
'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: One second after the ignition switch is turned ON (with the system in normal condition)

ANTI-LOCK BRAKE SYSTEM
CONSULT
(Cont'd)
SELF-DIAGNOSTIC RESULTS MODE
Diagnostic item I Diagnostic item is detected when ... I Check item
FR RH SENSOR
[OPEN] Circuit
for front right wheel sensor is open. Or an abnormally high input voltage is
entered due to short to battery.
FR LH SENSOR
[OPEN]
- -- -- - - - ---
Circuit for front left wheel sensor is open. Or an abnormally high input voltage is entered
due to short to battery.
1
FR RH SENSOR
[SHORTJ'I
, '2
REAR SENSOR
[OPEN] Circuit
for rear wheel sensor is open. Or an abnormally high input voltage is entered due
to short to battery.
1
FR LH SENSOR
[SHORT] Front
right wheel sensor is short-circuited or shorted to ground, or gap between the
wheel sensor and the sensor rotor is large. An abnormally low
input voltage is entered
and input signal is abnormal.
Front left wheel sensor is short-circuited or shorted to ground, or gap between the wheel
sensor and the sensor rotor is large. An abnormally low input voltage is entered and
input signal is abnormal. Wheel
sen-
sor and cir-
cuit
REAR SENSOR
[SHORT
11'1, '2
Rear wheel sensor is short-circuited or shorted to ground, or gap between the wheel
sensor and the sensor rotor is large.
An abnormally low input voltage is entered and
input signal is abnormal.
FR RH IN ABS SOL
[OPEN]
FR LH IN ABS SOL
[OPEN] Circuit
for front right inlet solenoid valve is open, or an output voltage is much lower than
the specified value due to short to ground.
Circuit for front left inlet solenoid valve is open, or an output voltage is much lower than
the specified value due to short to ground.
REAR IN ABS SOL
[OPEN] Circuit
for rear inlet solenoid valve is open, or
an output voltage is much lower than the
specified value due to short to ground.
FR RH IN ABS SOL
[SHORT] Circuit
for front right inlet solenoid valve is shorted, or an output voltage is much higher
than the specified value due to short to battery.
FR LH IN ABS SOL
[SHORT] Circuit for front
left inlet solenoid valve is shorted, or an output voltage is much higher
than the specified value due to short to battery.
REAR IN ABS SOL
[SHORTJ
FR RH OUT ABS SOL
[OPEN]
FR
LH OUT ABS SOL
[OPEN]
REAR OUT ABS SOL
[SHORT]
FR RH OUT ABS SOL
[SHORT]
FR LH OUT ABS SOL
[SHORT]
RWR OUT ABS SOL
[SHORT] Circuit for
rear inlet solenoid valve is shorted, or an output voltage is much higher than
the specified value due to short to battery.
Circuit for front right outlet solenoid valve
is open, or an output voltage is much lower
than the specified value due to short to ground.
Circuit for front left outlet solenoid valve is open, or an output voltage is much lower than
the specified value due to short to ground.
Circuit for rear outlet solenoid valve is open, or an output voltage is much lower than the
specified value due to short to ground.
Circuit for front right outlet solenoid valve
is shorted, or an output voltage is much higher
than the specified value due to short to battery.
Circuit for front left outlet solenoid valve is shorted, or an output voltage is much higher
than the specified value due to short to battery.
- -- -- - - Circuit for rear outlet solenoid valve is shorted, or an output voltage is much higher than
the specified value due to short to battery.
ABS MOTOR
[ON FAILURE]
ABS MOTOR
[OFF FAILURE] ABS
sole-
noid
and cir-
cuit
ABS ACTUATOR RELAY
[ON FAILURE]
ABS ACTUATOR RELAY
[OFF FAILURE] ABS
motor turns ON when control unit sends OFF signal. ABS motor circuit is open or
shorted to ground.
ABS motor turns OFF when control unit sends ON signal. Relay control wire is broken. ABS motor,
motor relay
and circuit
ABS actuator relay tums ON when control unit sends OFF signal. Actuator relay is
short-
circuited to ground.
ABS actuator relay tums OFF when control unit sends ON signal. Relay control wire is
broken. ABS
actuator
relay and
circuit