e28b6d96fca98600b5b932919d6f31f8394c55636fbe597bc92c65a2719d7929

nsxd19076a.pdf

System Description
TCS Control unit
Acceleration Control:
The TCS control unit gets signals from the wheel sensors about the rotational speed of each wheel. Traction control
is activated when the rotational speed of the driving wheels differs from the rotational speed of the driven wheels (i.e.,
vehicle speed).
Handling Control:
Based on signals about driving wheel and driven wheel rotational speeds, the control unit calculates the car’s “yaw”
rate (i.e., the turn rate of the car’s body). Based on signals from the steering angle sensor, the control unit also calculates
the yaw rate expected by the driver. If the difference between actual and expected yaw rates is substantial—that is,
if the direction of the car’s body will exceed the driver’s expected line—the control unit signals the throttle actuator,
which closes the throttle valve, thus reducing engine power and maintaining the expected line.
Rough Road Control:
Based on signals from the wheel sensors, the control unit detects a rough road based on frequency of wheel rotational
vibration. The control unit then signals the throttle actuator to relax engine power, thus improving acceleration efficiency.
Grip Control:
Based on signals about wheel speed and yaw rate, the control unit determines the efficiency of the grip of the tires on
the road and signals the throttle actuator to relax engine power if necessary, thus improving grip.
Construction and Function
DRIVE WHEELS
Right wheel Left wheel
WHEEL SENSORS
Driving Wheel
Speed
Average speed
of left and
right wheels
Vehicle speed
Advance acceleration
Tire grip control
Acceleration
control
Target slip
ratio
Engine control block
ENGINE CONTROL
MODULE (ECM)
Throttle actuator (step motor)
Throttle valve control
Handling control
Rough road
detection
Rough road
control
Reference yaw rate
Lateral
acceleration
TCS CONTROL UNIT
STEERING ANGLE SENSOR
DRIVEN WHEELS
Right wheel Left wheel
Actual
yaw rate
Rotational
vibration
Speed difference in the
left and right wheels

Fail-Safe Function:
If the control unit detects an abnormality, it shuts the
traction control system off and causes the TCS in-
dicator light to come on. However if the abnormality is
detected while the TCS is activated, the control unit
first establishes the appropriate wheel spin velocity,
then shuts the system down, thus preventing excessive
wheel spin.
Self-Diagnosis Function:
If the control unit detects an abnormality, it records a
Diagnostic Trouble Code (DTC) which can be used to
diagnose the problem. The DTC is shown at the TCS in-
dicator light when the Service Check connector ter-
minals are connected with a jumper wire.
Steering Angle Detection
Steering angle is detected by the steering angle sensor,
located on the steering column. The sensor uses two
magneto-resistor (MR) elements to determine steering
angle and direction of rotation. When the driver turns
the steering wheel, a magnet in the steering shaft
generates waves in the “MR” elements. These waves
are amplified and converted into signals which the con-
trol unit can interpret as angle and direction of turn.
Vehicle Speed Detection
Wheel rotation speed is detected by the wheel sensors,
located at each wheel. The signals are sent to the con-
trol unit, which compares each wheel’s speed and de-
termines whether traction control is required.
MR ELEMENT
WHEEL SENSOR
GEAR PULSER
MR
ELEMENT
INDICATOR LIGHT

System Description
Engine Output Control
When the TCS is activated, the control unit signals the throttle actuator, located next to the throttle valve. The throttle
actuator is linked to the throttle valve through a series of reduction gears. Although the accelerator pedal position is
still within the driver’s control, the throttle valve is automatically relaxed to achieve optimum traction.
Construction and Function
LOST MOTION SPRING
(INSIDE RETURN SPRING)
THROTTLE VALVE
RETURN SPRINGS
DURING NORMAL DRIVING:
LOST
MOTION
SPRING
THROTTLE
LEVER
THROTTLE
RETURN SPRING
THROTTLE DRUM
THROTTLE
VALVE
THROTTLE ACTUATOR
(STEP MOTOR)
Movement of parts
while accelalator pedal open.
Movement of parts while
TCS is actuated.
DURING TCS ACTUATION:
THROTTLE ACTUATOR
(STEP MOTOR)
THROTTLE POSITION SENSOR
THROTTLE VALVE
THROTTLE DRUM
ACCELERATOR PEDAL
ANGLE SENSOR
TCS THROTTLE
LEVER

Attachments

061663fc37db4698e6f8fbf56f2d758101bc34ca3044fec7d29af2bcaa120486

nsxb19082a.pdf

TCS Control Unit Terminal Arrangement
Main Menu
Table of Contents
TCS Control Unit Terminal Arrangement
TCS CONTROL UNIT 14P CONNECTOR
| 1 2 3 Q | 4 5 6
7 8 91011l121314
‚Ир CONNECTOR WIRE SIDE OF FEMALE TERMINALS
Voltage
Terminal Wire Terminal sign . .
„umher ook” (Termina name) Descr’pt’on Measurement Conditions Output
terminals (Ignition Switch ON (lll) voltage
FRP (Front Detects right—front wheel Raise the car off the
‘l ORN/RED right pulse) sensor signal from the 1-GND ground and rotate the 0 V ↔ 5 V
ABS control unit right-front wheel.
GSEN VCC (Lg Power source for Lg sen’
Z WHT sensor power sor. 2-GND 5 V
7 SEEE‘XL
FLP (Front left Detects left‘front wheel Raise the car off the
3 ORN/BLK pulse) sensor signal from the 3—GND ground and rotate the 0 V ‹—› 5 \/
ABS control unit. left—front wheel.
RRP (Rear Detects right-rear wheel Raise the car off the
4 BLU/ORN right pulse) sensor signal from the 4-GND ground and rotate the 0 V ⇠≻ 5 V
ABS control unit. right-rear wheel.
STR VCC Power source for steering
5 VEL/RED (Steering angle sensor. 5_GND 5 ∀
angle sensor
power supply)
RLP (Rear left Detects left-rear wheel Raise the car off the
6 GRYNVHT pulse) sensor signal from the 6-GND ground and rotate the 0 V ≺→ 5 V
ABS control unit. IefHear wheel.
WARN1 Drives TCS indicator light Indicator light ON
(Warning lamp) (Shuts ofi the indicator Below 0.6 V
light ground circuit inside _
7 YEIJBLK the TCS control unit to 7 GND Indicator light OFF в
turn off the light when ¿Few
the system is normal). Vo ‘age
LT STR B (Steering Detects steering angle Rotate the steering
8 angle sensor sensor signal B. S-GND wheel. 5 V H O V
GRN/RED .
Signal B)
PNSW (Parking/ Detects shift position sig» Shift the transmission O V
neutral shift nal in [E] and E position. to P or N position.
9 RED ↼ ⊲ ⋅ ⋅ ⋅ ⋅ 9-GND . . .
position Signal) (Manual transmisswn. no Shift the ↥↾∂⊓⊴⊓⋅∎∎⋝≙∣∘⊓ to
conne‘mon) except IE or 圆 position. 10 V
STOP (Brake Detects brake switch sig- Brake pedal Battew
10 GRN/WHT switch signal) nal. 1o_GND depressed. voltage
Brake pedal released. O V
TCSW (TCS Detects TCS switch sig- Push the TCS switch. Battery
switch signal) nal. voltage
11 YEL/GRN 11—GND
Release the TCS
. 0 V
sw1tch.
LG1 (Logic Ground for the TCS con-
12 BRN/BLK ground) trol unit control circuits. 12’GND Bemw 0’3 V
LT STR A (Steering Detects steering angle Rotate the steering
13 GRN/wm, angle sensor sensor Signal A. ‘IS-GND wheel. 5V<—>0V
Signal A)
14 YEL lG‘l (lgnition Detects Ignition sWItch ”GND Battery
swnch) IG1 Signal. voltage
19-82

Mam Menu
Table of Contents
TCS CONTROL UNIT 20P CONNECTOR
T…
2 5 6 7 8 9 10
1 1 12 14 17 18 19
20P CONNECTOR WIRE SIDE OF FEMALE TERMINALS
Voltage
Terminal Wire Terminal sign Desai fion _ _
number color (Terminal name) p Measurement _ _ condmons output
terminals (Ignition Switch ON (ll)) voltage
PARK (Parking Detects Parking brake Pull the parking brake Below 0.6 V
brake swnch switch Signal. lever up.
2 GRN/RED si na.) 2—GND
g Release the parking Battery
brake lever. voltage
SDL SELD F| serial data line shield. Check for continuity. There is
5 BLK (Serial data 5—GND continu”
line shield) ⋎
− AT SHIFT (NT Detects А/Т shift position Shift the transmission A mx 4 V
6 ORN/BLU shift position) signal. B-GND to El position. pp ‘
. ⊲ ⋅ (5 V ‹—› 0 V)
Engine idling.
SCS (Service Detects service check SCS service connector 0 V
check signal) connector signal (diag— connected.
7 BLU nostic trouble code indi- 7’GND SCS sen,¡ce connector
canon)“ disconnected. 5 V
в BLK GSEN GND (Lg Ground for the Lg sensor. 8_GND Below 03 v
sensor ground)
GSEN SIG (Lg Detects Lg sensor signal. Connector side facing 3 5 ⋎
sensor signal) down. ‘
9 RED 9—GND Vertical 2.5 V
Connector Side facmg 1‘5 ∀
up.
1o WHT/YEL VB (Back-up Power source for diagnos» ↿∘≊≺⋮↾∖∥⊃ Elattery voltage at all Battery
voltage) tic trouble code memory. tlme. voltage
WARNZ Drives TCS indicator light Indicator light ON
(Warning (Shuts off the indicator Below 0’6 ∀
∏ YEL/BLK lamp) light ground clrcwt InSlde “_GND Indicator „ght OFF
the TCS control unit to Banery
turn off the light when voltage
the system is normal).
12 BRN/BLK “Gz ∥−∘⊊⇃∣∁ ∊↾∘⊔⋯⋅↿ f°r the ⊤≺⋅∶⊱ ∘⋅∘⊓− 12-GND Below 0.3 v
ground) trol unit control eircwts.
Fl SDL (Fl Serial data line to com- Engine idling.
м RED/BLU serial data line) municate with the ECM. ”’GND Аррюх’ 3 ∀
NEP (Engine Detects engine speed Engine idling. Approx. 6 V
17 GRN speed signal) signal. ”GND (12V‹-›0V)
STR GND Ground for the steering
18 BRN/WHT (Steering angle angle sensor. 18-GND Below 0.3 V
sensor ground)
GSEN SELD Lg sensor line shield. Check for continuity. There ¡s
19 BLK (Lg sensor 19-GND commun
shield) ⋎⋅
19-83

Attachments

42bbe887821031a05dbc44f75d041e9598bd5baba05796a9f5a2f8d8ceffe444

nsxb19070a.pdf

ABS Control Unit
Replacement
SRS components are located in this area. Review the SRS
component locations, precautions, and procedures in the
SRS section 24 before performing repairs or service.
1. Remove the dashboard lower cover and glove box,
and disconnect the light connector.
GLOVE BOX
DASHBOARD LOWER COVER
2. Move the heater duct to the right and remove it.
HEATER DUCT
3. Disconnect the connectors from the ABS control unit
by removing the wire harness band.
ABS CONTROL UNIT
4. Remove the four control unit attaching bolts, then
remove the bracket with the control unit.
5. Remove the ABS control unit from the bracket.
ABS CONTROL UNIT
BRACKET
CONTROL UNIT
ATTACHING BOLTS
10 N-m (1.0 kg-m, 7 Ib-ft)
6. Installation is the reverse of removal procedure.
NOTE: After installation, start the engine and make
sure that the ABS indicator light goes off.

Attachments

2d7a75d723cce718d0b962c8bf7508bbfc751680ceff061c4a47fbcc54acedf6

nsxb19107a.pdf

Electronic Components
TCS Switch Inspection
Between terminal No. 4 and No. 5
(Illumination light circuit)
There should be continuity.
Between terminal No. 1 and No. 2
(Switch circuit)
There should be continuity when the switch is pushed,
and there should be no continuity when the switch is
released.
TCS SWITCH
TCS SWITCH
Lateral Acceleration (Lg) Sensor
Inspection
CAUTION: Be careful not to drop or bump the Lg sensor,
and don’t remove or install it with an impact wrench;
the Lg sensor may be damaged.
1. Remove the rear center trim panel (see section 20).
2. Remove the Lg sensor from the bracket.
BRACKET
Lg SENSOR
3. Turn the ignition switch ON (II).
4. Measure the voltage between terminal No. 1 and
No. 2 with the connector connected.
• There should be approx. 2.5 V when the Lg sensor
is vertical.
• There should be approx. 1.5 V when the Lg sensor
is horizontal with the connector side facing up.
• There should be approx. 3.5 V when the Lg sensor
is horizontal with the connector side facing down.
Lg SENSOR CONNECTOR
WIRE SIDE OF FEMALE TERMINALS
VERTICAL
Lg SENSOR
CONNECTOR
CONNECTOR SIDE FACING UP
CONNECTOR
CONNECTOR SIDE FACING DOWN
CONNECTOR

Attachments

245267318f3dc872d617cef6e161e477cac5ce2b349efeb5843dccacaf8231be

nsxb19015a.pdf

Pushrod Clearance Adjustment
NOTE: Master cylinder pushrod-to-piston clearance
must be checked and adjustments made, if necessary,
before installing master cylinder.
1. Set the special tool on the master cylinder body;
push in the center shaft until the top of it contacts
with the end of the secondary piston by turning the
adjusting nut.
07JAG-SD40100
2. Without disturbing the center shaft’s position, in-
stall the special tool upside down on the brake
booster.
3. Install the master cylinder nuts and tighten to the
specified torque.
4. Connect the brake booster in-line with a vacuum
gauge 0-760 mm Hg (0 -30 in Hg) to the
booster’s engine vacuum supply, and maintain a
engine speed that will deliver 500 mm Hg (20 in
Hg) vacuum.
5. With a feeler gauge, measure the clearance be-
tween the gauge body and the adjusting nut as
shown.
NOTE: If the clearance between the gauge body
and adjusting nut is 0.4 mm (0.02 in), the pushrod-
to-piston clearance is 0 mm. However, if the
clearance between the gauge body and adjusting
nut is O mm, the pushrod-to-piston clearance is 0.4
mm (0.02 in) or more. Therefore, it must be ad-
justed and rechecked.
6. If clearance is incorrect, loosen the star locknut and
turn the adjuster in or out to adjust.
NOTE:
• Adjust the clearance while the specified vacuum
is applied to the brake booster.
• Hold the clevis while adjusting.
7. Tighten the star locknut securely.
8. Remove the special tool, and install a new master
cylinder rod seal in the brake booster.
07JAG-SD40100
9. Adjust the pushrod length as shown if the booster
is removed.
10. Install the master cylinder (see page 19-12).
11. After installation, perform the following inspec-
tions and adjust if necessary.
• Brake pedal height (see page 19-4).
• Brake pedal free play (see page 19-4).

Attachments

15fa9aa603471a9dac6462419f1585e55374926ff2ab287a3d608fbcdc3e42b9

nsxb19067a.pdf

Accumulator/Pressure Switch
Index/Torque
CAUTION:
Do not spill brake fluid on the car; it may damage the
paint; if brake fluid does contact the paint, wash it
off immediately with water.
To prevent spills, cover the hose jpints with rags or
shop towels.
Clean all parts in brake fluid and air dry; blow out all
passages with compressed air.
Before reassembling, check that all parts are free of
dust and other foreign particles.
Replace parts with new ones whenever specified to
do so.
Before disassembling the accumulator unit, bleed the
high-pressure brake fluid out from the system using
the Bleeder T-wrench (see page 19-62(’91-’92)(’93-’96)
the Bleeder
* : CORROSION RESISTANT BOLT
Make sure no dirt or other foreign matter is allowed
to contaminate the brake fluid.
Do not reuse the drained fluid.
Use only clean DOT 3 or 4 brake fluid.
NOTE: Replace the 0-ring with a new one before
reassembly.
The accumulator contains high-pressure
nitrogen gas, do not puncture, expose to flame, or at-
tempt to disassemble the accumulator or it may ex-
plode; severe personal injury may result.
19 N·m (1.9 kg-m,
14 Ib-ft)
PRESSURE SWITCH
SEALING WASHERS
Replace.
BANJO BOLT
35 N·m (3.5 kg-m, 26 Ib-ft)
6 x 1.0 mm
9 N·m (0.9 kg-m,
7 Ib-ft)
ACCUMULATOR
Disposal, page 19-68
* 6 x 1.0 mm
10 N·m (1.0 kg-m, 7 Ib-ft)
O-RING
Replace.
PRESSURE SWITCH
JOINT
6 x 1.0 mm
10 N·m (1.0 kg-m,
7 Ib-ft)

Attachments

816a6b5b08221af9765aa947113a1b913d1228c4196d8bf103c993981eea7a2d

nsxb19069a.pdf

Bleeding
Air Bleeding with ALB Checker
1. Disconnect the 6-P inspection connector (PNK)
from the connector cover located under the glove
box, and connect the 6-P inspection connector to
the special tool.
CONNECTOR
COVER
ALB CHECKER
07HAJ – SG0010B
6-P INSPECTION
CONNECTOR
CAUTION: Place the vehicle on level ground with
the wheels blocked. Put the transmission in neutral
for manual transmission models, or in for auto-
matic transmission models.
2. Fill the modulator reservoir to the MAX level line.
NOTE: Do not reuse aerated brake fluid that has
been bled from the power unit.
3. Bleed high-pressure fluid from the maintenance
bleeder with the special tool.
BLEEDER T-WRENCH
07HAA-SG00100
or
07HAA-SG00101
SOLENOID UNIT
ACCUMULATOR/
PRESSURE SWITCH POWERUNIT
MAINTENANCE
BLEEDER
8 x 1.25 mm
9 N-m (0.9 kg-m,
6.5 Ib-ft)
4. Start the engine and release the parking brake.
NOTE: Depress the brake pedal firmly while test in
progress light in ON.
5. There should be at least two strong kickbacks.
If not, repeat steps 2 through 5, as necessary.
6. Fill the modulator reservoir up to the MAX level
line.
RESERVOIR CAP
MAX LEVEL LINE
7. Install the reservoir cap.
8. Check the anti-lock brake system function in all
modes by using the ALB checker.

Attachments

05ebda2062f3a7415a0fa145b854660644e5a1ee5a47fadd751a43d05e4b8ad7

nsxb19019a.pdf

Rear Brake Disc
Run-Out Inspection
1. Raise each side of the car, and support it on safety
stands (see page 1-6 through 1-8). Remove the rear
wheels.
2. Remove the brake pads (see page 19-17).
3. Inspect the disc surface for grooves, cracks, and
rust. Clean the disc thoroughly and remove all rust.
4. Use suitable nuts (12 x 1.5 mm) and plain washers
to hold the disc securely against the hub, then
mount a dial indicator as shown.
Brake Disc Runout:
Service Limit: 0.10 mm (0.004 in)
5. If the disc is beyond the service limit, refinish the
rotor.
Max. Refinishing Limit: 19.0 mm (0.75 in)
NOTE: A new disc should be refinished if its
runout is greater than 0.1 mm (0.004 in).

Attachments

4accf6d257e9fe8c19194f25e1d66cc0172e82bdda8fec514d50fc07d739b859

nsxb19061a.pdf

Hydraulic System
Hydraulic Connections
CAUTION: Do not spill brake fluid on the car; it may damage the paint; if brake fluid does contact the paint, wash it off
immediately with water.

Attachments

7c704dca2f3f70c6e1c3d0a0dfbd8b31de0c49f42c5a84f7ed42f08b26cdb7b6

nsxe19061a.pdf

Hydraulic System
Hydraulic Connections
CAUTION: Do not spill brake fluid on the car; it may damage the paint; if brake fluid does contact the paint, wash it off
immediately with water.
BRAKE BOOSTER
MASTER CYLINDER
RESERVOIR TANK To right rear brake
To left rear brake
To left front brake
MASTER CYLINDER
To right front brake
POWER UNIT
MODULATOR/
SOLENOID UNIT
MODULATOR
RESERVOIR

Attachments