ESP Hydraulic Unit Operation Check

ESP(R) Hydraulic Unit Operation Check

NOTE:

A false diagnosis may result if operation check of the ESP(R) hydraulic unit is performed without satisfying all of the specified conditions.

Make sure that all the following conditions are met before performing operation check of the ESP(R) hydraulic unit.

- Battery voltage is 11 V or more.
- No air is trapped in the brake system.
- Brakes do not drag.
- No DTC is stored in ESP(R) hydraulic unit / control module assembly.

NOTE:

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

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

(A): 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(R) 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(R) hydraulic unit /control module assembly.
10) After completing the check, confirm that ignition mode of keyless push start system is in "OFF" and disconnect SUZUKI scan tool from DLC.