Nissan GT-R (R35) · Service Manual BRAKES

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)]

VDC/TCS/ABS

 
 FUNCTION

CONSULT-III displays each diagnostic item, using the diagnostic test modes shown below.

Diagnostic test mode
Function
Work support
This mode enables a technician to adjust some devices faster and more accurately by following the indications on CONSULT-III.
Self diagnostic result
Self-diagnostic results can be read and erased quickly.
Data monitor
Input/Output data in the ABS actuator and electric unit (control unit) can be read.
Active test
CONSULT-III drives some actuators apart from ABS actuator and electric unit (control unit) and also shifts some parameters in a specified range.
ECU identification
ABS actuator and electric unit (control unit) part number can be read.

 
 WORK SUPPORT

Item
 		Description
ST ANGLE SENSOR ADJUSTMENT
 		Adjusts the neutral position of the steering angle sensor.
DECEL G SEN CALIBRATION
 		Calibrates yaw rate/side/decel G sensor.
PRESS SEN CALIBRATION
 		Calibrates pressure sensor.
VALVE CALIBRATION
 		Calibrates valve.

 
 SELF DIAGNOSTIC RESULT
 
 Operation Procedure

Before performing the self-diagnosis, start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute.
 
 Display Item List

Refer to DTC No. Index.
 
 How to Erase Self-diagnosis Results

After erasing DTC memory, start the engine and drive the vehicle at 30 km/h (19 MPH) or more for approximately 1 minute as the final inspection, and check that the ABS warning lamp, VDC OFF indicator lamp, SLIP indicator lamp, and brake warning lamp turn OFF.
■ CAUTION ■
If memory cannot be erased, perform applicable diagnosis.
NOTE：
  • When the wheel sensor malfunctions, after inspecting the wheel sensor system, ABS warning lamp, VDC OFF indicator lamp, SLIP indicator lamp, and brake warning lamp do not turn OFF even when the system is normal unless the vehicle is driven at approximately 30 km/h (19 MPH) or more for approximately 1 minute.
  • Brake warning lamp turns ON when parking brake operation (when switch is ON) or when brake fluid level switch operation (when brake fluid is insufficient).
  • Set-up switch (VDC) should not stay in the “OFF mode” position.

 
 DATA MONITOR
 
 Display Item List

×: Applicable : Optional item
Monitor item (Unit)
SELECT MONITOR ITEM
Remarks
ECU INPUT SIGNALS
MAIN SIGNALS
FR LH SENSOR
[km/h (MPH)]
×
×
Wheel speed
FR RH SENSOR
[km/h (MPH)]
×
×
RR LH SENSOR
[km/h (MPH)]
×
×
RR RH SENSOR
[km/h (MPH)]
×
×
BATTERY VOLT
(V)
×
×
Battery voltage supplied to the ABS actuator and electric unit (control unit)
STOP LAMP SW
(On/Off)
×
×
Stop lamp switch signal status
OFF SW
(On/Off)
×
×
Set-up switch (VDC) signal status
GEAR
×
×
Gear position determined by TCM
SLCT LVR POSI
×
×
Shift lever position determined by TCM
DECEL G-SEN
(G)
×
×
Decel G detected by yaw rate/side/decel G sensor
YAW RATE SEN
(d/s)
×
×
Yaw rate detected by yaw rate/side/decel G sensor
FR RH IN SOL
(On/Off) (Note)

×
Operation status of each solenoid valve
FR RH OUT SOL
(On/Off) (Note)

×
FR LH IN SOL
(On/Off) (Note)

×
FR LH OUT SOL
(On/Off) (Note)

×
RR RH IN SOL
(On/Off) (Note)

×
RR RH OUT SOL
(On/Off) (Note)

×
RR LH IN SOL
(On/Off) (Note)

×
RR LH OUT SOL
(On/Off) (Note)

×
MOTOR RELAY
(On/Off)

×
Motor and motor relay operation
ACTUATOR RLY
(On/Off) (Note)

×
Actuator relay operation
ABS WARN LAMP
(On/Off)

×
ABS warning lamp
OFF LAMP
(On/Off)

×
VDC OFF indicator lamp
SLIP LAMP
(On/Off)

×
SLIP indicator lamp
ACCEL POS SIG
(%)
×

Throttle actuator opening/closing is displayed (linked with accelerator pedal)
SIDE G-SENSOR
(m/s2)
×

Side G detected by yaw rate/side/decel G sensor
STR ANGLE SIG
(°)
×

Steering angle detected by steering angle sensor
ENGINE RPM
[tr/min (rpm)]
×

Engine speed
PRESS SENSOR
(bar)
×

Brake fluid pressure detected by pressure sensor
FLUID LEV SW
(On/Off)
×

Brake fluid level switch signal status
CV1
(On/Off) (Note)


VDC switch-over valve
CV2
(On/Off) (Note)


SV1
(On/Off) (Note)


SV2
(On/Off) (Note)


EBD SIGNAL
(On/Off)


EBD operation
ABS SIGNAL
(On/Off)


ABS operation
TCS SIGNAL
(On/Off)


TCS operation
VDC SIGNAL
(On/Off)


VDC operation
EBD FAIL SIG
(On/Off)


EBD fail-safe signal
ABS FAIL SIG
(On/Off)


ABS fail-safe signal
TCS FAIL SIG
(On/Off)


TCS fail-safe signal
VDC FAIL SIG
(On/Off)


VDC fail-safe signal
CRANKING SIG
(On/Off)


Crank operation
V/R OUTPUT
(On/Off) (Note)


Solenoid valve relay activated
M/R OUTPUT
(On/Off)


Actuator motor and motor relay activated
NOTE：
The On/Off indication may switch briefly at irregular intervals after turning ON the ignition switch. This is a validation operation and not a malfunction.

 
 ACTIVE TEST

■ CAUTION ■
  • Never perform active test while driving vehicle.
  • Always completely bleed air from brake system.
  • The active test cannot be started when ABS warning lamp, VDC OFF indicator lamp, SLIP indicator lamp, and brake warning lamp are ON.
  • ABS warning lamp, VDC OFF indicator lamp, SLIP indicator lamp, and brake warning lamp are ON during active test.
NOTE：
  • When active test is performed while depressing the pedal, the pedal depression amount will change. This is normal.
  • “TEST IS STOPPED” is displayed 10 seconds after operation start.
  • After “TEST IS STOPPED” is displayed, to perform test again.
 
 Test Item


ABS SOLENOID VALVE
  • Touch “Up”, “Keep”, and “Down”. Then use screen monitor to check that solenoid valve operates as shown in the table below.
    Test item
    		Display item
    		Display (Note)
    Up
    		Keep
    		Down
    FR RH SOL
    		FR RH IN SOL
    		Off
    		On
    		On
    FR RH OUT SOL
    		Off
    		Off
    		On*
    CV1
    		Off
    		Off
    		Off
    SV1
    		Off
    		Off
    		Off
    FR LH SOL
    		FR LH IN SOL
    		Off
    		On
    		On
    FR LH OUT SOL
    		Off
    		Off
    		On*
    CV1
    		Off
    		Off
    		Off
    SV1
    		Off
    		Off
    		Off
    RR RH SOL
    		RR RH IN SOL
    		Off
    		On
    		On
    RR RH OUT SOL
    		Off
    		Off
    		On*
    CV2
    		Off
    		Off
    		Off
    SV2
    		Off
    		Off
    		Off
    RR LH SOL
    		RR LH IN SOL
    		Off
    		On
    		On
    RR LH OUT SOL
    		Off
    		Off
    		On*
    CV2
    		Off
    		Off
    		Off
    SV2
    		Off
    		Off
    		Off
    *: “On” is indicated for 1 to 2 seconds after the touch and then changes to “Off”.
    NOTE：
    The On/Off indication may switch briefly at irregular intervals after turning ON the ignition switch. This is a validation operation and not a malfunction.


ABS SOLENOID VALVE (ACT)
  • Touch “Up”, “ACT UP” and “ACT KEEP”. Then use screen monitor to check that solenoid valve operates as shown in the table below.
    Test item
    		Display item
    		Display (Note)
    Up
    		ACT UP
    		ACT KEEP
    FR RH ABS SOLENOID (ACT)
    		FR RH IN SOL
    		Off
    		Off
    		Off
    FR RH OUT SOL
    		Off
    		Off
    		Off
    CV1
    		Off
    		On
    		On
    SV1
    		Off
    		On*
    		Off
    FR LH ABS SOLENOID (ACT)
    		FR LH IN SOL
    		Off
    		Off
    		Off
    FR LH OUT SOL
    		Off
    		Off
    		Off
    CV1
    		Off
    		On
    		On
    SV1
    		Off
    		On*
    		Off
    RR RH ABS SOLENOID (ACT)
    		RR RH IN SOL
    		Off
    		Off
    		Off
    RR RH OUT SOL
    		Off
    		Off
    		Off
    CV2
    		Off
    		On
    		On
    SV2
    		Off
    		On*
    		Off
    RR LH ABS SOLENOID (ACT)
    		RR LH IN SOL
    		Off
    		Off
    		Off
    RR LH OUT SOL
    		Off
    		Off
    		Off
    CV2
    		Off
    		On
    		On
    SV2
    		Off
    		On*
    		Off
    *: “On” is indicated for 1 to 2 seconds after the touch and then changes to “Off”.
    NOTE：
    The On/Off indication may switch briefly at irregular intervals after turning ON the ignition switch. This is a validation operation and not a malfunction.


ABS MOTOR
  • Touch “On” and “Off” on screen. Check that motor relay and actuator relay operates as shown in table below.
    Test item
    		Display item
    		Display
    On
    		Off
    ABS MOTOR
    		MOTOR RELAY
    		On
    		Off
    ACTUATOR RLY (Note)
    		On
    		On
    NOTE：
    The On/Off indication may switch briefly at irregular intervals after turning ON the ignition switch. This is a validation operation and not a malfunction.

 
 ECU IDENTIFICATION

ABS actuator and electric unit (control unit) part number can be read.