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.
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)
2007 > 2.7L V6 GASOLINE >
DESCRIPTION
1.The yaw - rate & lateral G sensor is applied for the ESP system.
2. The yaw - rate is the angular velocity, when a vehicle turns a corner, and the lateral G is the acceleration to move a
vehicle out of the way when cornering.
3. The sensor is located in the crash pad lower floor on vehicle.
SPECIFICATION
Description SpecificationRemark
Nominal supply voltage 11.5 ~ 12.5 V
Supply voltage range 8 ~ 16 V
Supply current Max. 120 mATyp. 75 mA
Reference Voltage Output 2.464 ~ 2.536 VTyp. 2.5 V
Operating temperature range - 40 ~ 85°C
Yaw - late sensor Measurement range+w direction, left turn
Min.100 °/sTyp. 111 °/S
- w direction, right turn Min.100 °/sTyp. 111 °/S
Non- linearity - 1 ~ 1 %
Offset (within life,within operating temperature) 3.75 °/S
Upper cut- off frequency Min. 45 HzTyp. 60 Hz
Lateral G sensor Measurement range+y direction, left turn
Min.1.8 gTyp. 2 g
- y direction, right turn Min. - 1.8 gTyp. 2 g
Non- linearity - 4 ~ 4 %
Offset (within life,within operating temperature) - 0.09 ~ 0.09 g
Upper cut- off frequency Min. 20 HzTyp. 40 Hz
OUTPUT CHARACTERISTIC
