Electronic Stability Program: Overview Suzuki Kizashi I

When disconnecting ESP® hydraulic unit/control module assembly connector, be sure to disconnect the negative cable at battery since the battery voltage is constantly applied to ESP® hydraulic unit / control module assembly.

ABS Description

The ABS (Anti-lock Brake System) controls the fluid pressure applied to the caliper of each brake from the master cylinder so that each wheel is not locked even when hard braking is applied.

This ABS is equipped with EBD function.

While brake is applied not so hard as to activate ABS control, brake force is proportionally distributed between the front and rear brakes to prevent rear wheels from being locked too early for better stability of the vehicle.

If the EBD system fails, the EBD warning light (brake warning light) lights to inform abnormality.

Scheme 1

1. ESP® (ABS) hydraulic unit/control module assembly detects wheel slip by the signal from wheel speed sensor of each wheel and sends control signals to the hydraulic unit. ESP® hydraulic unit/control module assembly also monitors system conditions and stops the function of ABS and lights the ABS warning light in case it judges that the system is faulty.
2. ESP® hydraulic unit is composed of inlet solenoid valves (4) (normally-opened valves), outlet solenoid valves (5) (normally-closed valves), pumps (3) pump motor (2), reservoirs (6) and check valves (7). It activates the inlet and outlet solenoid valves by the signals from ESP® hydraulic unit/control module assembly and controls the brake fluid pressure applied on each wheel brake. (The following figure shows the circuit for one wheel, with inlet and outlet solenoid valves in OFF positions.)

The hydraulic pressure control is performed in 3 modes of pressure increase, pressure keeping and pressure reduction.

1. In the pressure increase mode, inlet and outlet solenoid valves are turned OFF, and the brake fluid pressure applied from the master cylinder to the caliper is increased.
2. In the pressure keeping mode, the inlet solenoid valve is turned ON, and the brake fluid pressure in the caliper is kept constant.
3. In the pressure reduction mode, inlet and outlet solenoid valves are turned ON, and the brake fluid pressure applied to the caliper is released to the reservoir. Thus the brake pressure applied to the wheel likely to be locked is reduced. The brake fluid temporarily stored in the reservoir is pumped back to the master cylinder.

ESP® Description

Note. ESP® is registered trademark of Daimler AG.

ESP® (Electronic Stability Program) is an auxiliary function to enable the vehicle to stabilize while the vehicle is running, stopping or turning.

ESP® consists of the following functions.

ESP® Components Description

ESP® hydraulic unit/control module assembly is composed of the following components. Regarding location, refer to ESP® COMPONENT LOCATION .

Warning/Indicator Light Description

There are four warning and indicator lights controlled by ESP® hydraulic unit/control module assembly in combination meter. They give warnings and indications to driver by changing their modes: light ON/flashing/light OFF.

Scheme 2

Condition and Operation of Warning Lights and Indicator Lights

WARNING LIGHTS AND INDICATOR LIGHTS CONDITION CHART

Description of Sensor Calibrating Condition

When the following conditions are met, sensor calibration should be performed since the original calibration data are deleted.

SENSOR CALIBRATING CONDITION DESCRIPTION CHART

Perform sensor calibration according to SENSOR CALIBRATION OF ESP® .

DLC Description

1. Refer to «DLC DESCRIPTION»(ref-585590-S06918630212013111200000) .

CAN Communication System Description

Refer to CAN COMMUNICATION CHECK for CAN communication system description.

Scheme 3

Scheme 4

Scheme 5

ESP TERMINAL REFERENCE

Scheme 6

ESP® Hydraulic Unit Operation Check

Note. Operation check must be performed by 2 persons. DTC C1074, C1075 are detected, and ESP® warning light and ABS warning light are lit when ESP® hydraulic unit/control module assembly (hydraulic unit) is replaced. Perform ESP® hydraulic unit operation check after sensor calibration. (Sensor calibration of ESP®) Lighting or blinking warning light turn OFF when engine switch is pressed to change the ignition mode to ON after ESP® hydraulic unit operation check.

Scheme 7

Scheme 8

1. Push engine switch to change ignition mode of keyless push start system to "ON".
2. Connect SUZUKI scan tool to DLC (1) located underside of instrument panel at driver's seat side. Special Tool SUZUKI scan tool (SUZUKI-SDT)
3. Hoist vehicle until tire can be rotated.
4. Set transmission to neutral and release parking brake.
5. Push engine switch to change ignition mode of keyless push start system to "ON" and select menu "Depressurization check"/"Pressurization check" in "hydraulic control test" under "Utility" mode of SUZUKI scan tool. Refer to SUZUKI scan tool operator's manual for further details.
6. Perform the following checks with help of another person. Depressurization check Step on brake pedal (1) and then select testing wheel by SUZUKI scan tool and the wheel (2) should be turned by another person's hand. At this time, check whether the wheel rotates freely due to brake depressurization. Pressurization check Step off brake pedal (1) and then select testing wheel by SUZUKI scan tool and the wheel (2) should be turned by another person's hand. At this time, check whether the wheel is locked due to brake pressurization. NOTE: Pressurization/Depressurization by SUZUKI scan tool is available for 0.5 seconds.
7. Check for all 4-wheels respectively.
8. Confirm ABS warning light and ESP® warning light are turned off after changing ignition mode of keyless push start system from "OFF" to "ON". Check for DTC and repair trouble if lights are still lit.
9. If any faulty condition is found, replace ESP® hydraulic unit/control module assembly.
10. After completing the check, confirm that ignition mode of keyless push start system is in "OFF" position and disconnect SUZUKI scan tool from DLC.