2007 KIA CARNIVAL wheel

2.Compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage
as shown below.
a.V_low : 0.44 V ~ 0.63 V
b. V_high : 0.885 V ~ 1.26 V
c. Frequency range : 1~2,500 Hz

Rear Wheel Speed Sensor

2007 > 2.7L V6 GASOLINE >
REMOVAL
1.Remove the rear wheel speed sensor mounting bolt (A).
2.Remove the rear seat side pad then disconnect the rear wheel speed sensor connector (A).
INSPECTION
1.Measure the output voltage between the terminal of the wheel speed sensor and the body ground.
In order to protect the wheel speed sensor, when measuring output voltage, a 75Ω resistor must be used as
shown.
2. Compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage
as shown below.

2007 > 2.7L V6 GASOLINE >
DESCRIPTION
The EBD system (Electronic Brake force Distribution) as a sub- system of the ABS system is to control the effective
adhesion utilization by the rear wheels.
It further utilizes the efficiency of highly developed ABS equipment by controlling the slip of the rear wheels in the
partial braking range.
The brake force is moved even closer to the optimum and controlled electronically, thus dispensing with the need for
the proportioning valve.
The proportioning valve, because of a mechanical device, has limitations to achieve an ideal brake force distribution
tothe rear wheels as well as to carry out the flexible brake force distribution proportioning to the vehicle load or weight
increasing. And in the event of malfunctioning, driver cannot notice whether it fails or not.
EBD controlled by the ABS Control Module, calculates the slip ratio of each wheel at all times and controls the brake
pressure of the rear wheels not to exceed that of the front wheels.
If the EBD fails, the EBD warning lamp (Parking brake lamp) lights up.
ADVANTAGES
a.Function improvement of the base - brake system.
b. Compensation for the different friction coefficients.
c. Elimination of the proportioning valve.
d. Failure recognition by the warning lamp.
Comparison between Proportioning valve and EBD

26Wheel sensor voltage(FL)
Battery voltageIG ON
9
Wheel sensor voltage(FR)
6 Wheel sensor voltage(RL)
8 Wheel sensor voltage(RR)
5 Wheel sensor signal(FL)
Voltage(High) : 0.89~1.26 VVoltage(Low) : 0.44~0.63 V RUNNING
10
Wheel sensor signal(FR)
27 Wheel sensor signal(RL)
29 Wheel sensor signal(RR)
11 Diagnosis Input/oupput Voltage(High) : 0.8 * IG ON more
Voltage(Low) : 0.2 * IG ON lower SCAN TOOL
Communication
28 Ignition Battery voltageKEY ON/OFF
31 ESP Passive switch Voltage(High) : 0.6 * IG ON more
Voltage(Low) : 0.4 * IG ON lower Switch ON/OFF
36 Hand brake switch Voltage(High) : 0.7 * IG ON more
Voltage(Low) : 0.3 * IG ON lower Switch ON/OFF
37 Yaw Rate Sensor Test Voltage(High) : 4.1 V more
Voltage(Low) : 1 V lower IG ON
18 Yaw Rate Sensor Reference 2.464 V ~ 2.536 VIG ON
16 Yaw Rate Sensor Signal
Offset voltage :2.5 V
range : 0.35 V ~ 4.65 V(- 100 ~ 100 °/s) IG ON
20 Acceleration Sensor Signal Offset voltage :2.5 V
range : 0.35 V ~ 4.65 V(- 1.8 g ~ 1.8 g) IG ON
15 Yaw Rate Sensor Ground GND LEVELAlways
35 CAN High not communicating:2.5 ± 0.5 V
communication :
IG ON
14 CAN Low
30 BRAKE LIGHT SWITCH voltage(High) : 0.8 * IG ON more
voltage(Low) : 0.3 * IG ON lower BRAKE ON/OFF

2007 > 2.7L V6 GASOLINE >
description of ESP
Optimum driving safety now has a name : ESP, the Electronic Stability Control.
ESP recognizes critical driving conditions, such as panic reactions in dangerous situations, and stabilizes the vehicle
by wheel- individual braking and engine control intervention with no needfor actuating the brake or the gas pedal.
ESP adds a further function known as Active Yaw Control (AYC) to the ABS, TCS, EBD and ESP functions. Whereas
the ABS/TCS function controls wheel slip during braking and acceleration and, thus, mainly intervenes in the
longitudinal dynamics of the vehicle, active yaw control stabilizes the vehicle about its vertical axis.
This is achieved by wheel individual brake intervention and adaptation of the momentary engine torque with no need
for any action to be taken by the driver.
ESC essentially consists of three assemblies : the sensors, the electronic control unit and the actuators.
Of course, the stability control feature works under all driving and operating conditions. Under certain driving
conditions, the ABS/TCS function can be activated simultaneously with the ESP function in response to a command
by the driver.
In the event of a failure of the stability control function, the basic safety function, ABS, is still maintained.
DESCRIPTION OF ESP CONTROL
ESP system includes ABS/EBD, TCS and AYC (Active yaw control) function.
ABS/EBD function : The ECU changes the active sensor signal (current shift) coming from the four wheel sensors to
the square waveform.By using the input of above signals, the ECU calculates the vehicle speed and the acceleration
& deceleration of the four wheels.And, the ECU judges whether the ABS/EBD should be actuated or not.
TCS function prevents the wheel slip of drive direction by adding the brake pressure and engine torque reduction via
CAN communication.TCS function uses the wheel speed sensor signal to determine the wheel slip as far as ABS
function.
AYC function prevents unstable maneuver of the vehicle. To determine the vehicle maneuver, AYC function uses the
maneuver sensor signals(Yaw Rate Sensor, Lateral Acceleration Sensor, Steering Wheel Angle Sensor).If vehicle
maneuver is unstable (Over Steer or Under Steer), AYC function applies the brake pressure on certain wheel, and
send engine torque reduction signal by CAN.
After the key - on, the ECU continually diagnoses the system failure. (self- diagnosis)If the system failure is detected,
the ECU informs driver of the system failure through the BRAKE/ABS/ESP warning lamp. (fail- safe warning)

2.STEP 2
It analyzes the movement of the ESP vehicle.
3. STEP 3
he HECU calculates the required strategy, then actuates the appropriate valves and sents torque control requests
via CAN to maintain vehicle stability.
ESP OPERATION MODE
1.ESP Non- operation - Normal braking.
Inlet valve(EV)Outlet valve(AV)Pilot valve(USV)High pressure
switch valve(HSV)Pump motor
Normal braking OpenCloseOpenCloseOFF
EV : Inlet Valve
AV : Outlet Valve
LR : Rear left wheel
RF : Front right wheel
LF : Front left wheel
RR : Rear right wheel
PE : Pump motor

USV : Pilot Valve
HSV : High pressure Switch Valve
2. ESP INCREASE MODE
Inlet valve(EV)Outlet valve(AV)Pilot valve(USV)High pressure
switch valve(HSV)Pump motor
Normal braking OpenCloseClose(Partial)OpenON(Motor speed
control)
EV : Inlet Valve
AV : Outlet Valve
LR : Rear left wheel
RF : Front right wheel
LF : Front left wheel
RR : Rear right wheel
PE : Pump motor
USV : Pilot Valve
HSV : High pressure Switch Valve
3. ESP HOLD MODE ( FR is only controlled.)
Inlet valve(EV)Outlet valve(AV)Pilot valve(USV)High pressure
switch valve(HSV)Pump motor
Normal braking CloseCloseClose(Partial)OpenON(Motor speed
low control)