Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Acura 3.5RL 1996-2004 Approved srm RL9604S19151A
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Main Menu Table of Contents
Construction and Function
TCS Control unit
Driving Control
When the drive wheel speed exceeds the vehicle speed by a given amount, the TCS control unit judges that the drive
wheels are slipping, and it outputs the traction control signal to reduce engine power.
Handling Control
Based on signals about right and left driven wheel rotational speeds, the control unit calculates the vehicle's "yaw" rate
(the turn rate of the vehicle'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 vehicle's body will exceed the driver's expected line -- the control unit signals the TCS control valve actu-
ator and PCM, 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 TCS control valve actuator and PCM 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 TCS control valve actuator and PCM to relax engine power if necessary, thus improving grip.
Main Control Block
Main Menu Table of Contents
System Description
Fail-Safe Function
If the control unit detects an abnormality, it shuts the
traction control system off and causes the TCS indicator
light to come on. However if the abnormality is detected
while the TCS is activated, the control unit first estab-
lishes the appropriate wheel spin velocity, then shuts
the system down, thus preventing excessive wheel spin.
Self-Diagnosis Function
TCS INDICATOR LIGHT
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 LIGHT RECEIVING PART
indicator light when the Service Check connector termi- (PHOTO TRANSISTOR)
FIXED SLIT
nals are connected with the SCS service connector.
Steering Angle Detection LIGHT EMITTING PART (LED)
Steering angle is detected by the steering angle sensor.
A disc with a regular pattern of slits is positioned between
the facing parts of a light emitting part (LED), and a light
receiving part (photo transistor). As the disc rotates, it
SLIT
interrupts the light from the LED. The light which passes
through a slit is converted into the electric current by the
photo transistor, and the waveform of this electric cur-
rent is shaped by the comparator to output the disc rota-
tion as a rectangular signal.
The analysis performance of the system is improved by
providing the fixed slit in front of the LED, and thereby
identifying the brightness and darkness of the light which
is received at the photo transistor.
The output signal is a 2-phase output (A-phase and Bi-
phase), and the steering wheel turning angle and the
turning direction are calculated by the TCS control unit.
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 deter-
mines whether traction control is required. Steering wheel is
turned to right.
Main Menu Table of Contents
Engine Output Control
When the TCS is activated, the TCS control unit signals the TCS control valve actuator and PCM. The actuator is linked to
the TCS control valve which is normally returned to the fully open position by the two return springs. Although the throttle
valve is still within the driver's control, the engine output is relaxed by the TCS control valve and PCM to achieve optimum
traction.
TCS CONTROL VALVE SENSOR
TCS CONTROL VALVE
RETURN SPRINGS
TCS CONTROL VALVE
TCS CONTROL VALVE
ACTUATOR (DC MOTOR)
DURING NORMAL DRIVING: DURING TCS ACTUATION:
TCS CONTROL VALVE TCS CONTROL VALVE
RETURN SPRINGS
TCS CONTROL VALVE
ACTUATOR (DC MOTOR) TCS ACTUATION SIGNAL
FROM TCS CONTROL UNIT
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