Hyundai Tucson: ESC(Electronic stability system) System / Troubleshooting

Hyundai Tucson (LM) 2010-2015 Service Manual / Brake System / ESC(Electronic stability system) System / Troubleshooting

Failure Diagnosis

1.	In principle, ESC and TCS controls are prohibited in case of ABS failure.

2.	When ESC or TCS fails, only the failed system control is prohibited.

3.	However, when the solenoid valve relay should be turned off in case of ESC failure, refer to the ABS fail-safe.

4.	Information on ABS fail-safe is identical to the fail-safe in systems where ESC is not installed.

Memory of Fail Code

1.	It keeps the code as far as the backup lamp power is connected. (O)

2.	It keeps the code as far as the HCU power is on. (X)

Failure Checkup

1.	Initial checkup is performed immediately after the HECU power on.

2.	Valve relay checkup is performed immediately after the IG2 ON.

3.	It executes the checkup all the time while the IG2 power is on.

Countermeasures in Fail

1.	Turn the system down and perform the following actions and wait for HECU power OFF.

2.	Turn the valve relay off.

3.	Stop the control during the operation and do not execute any until the normal condition recovers.

Warning Lamp ON

1.	ESC operation lamp turn on for 3sec after IGN ON.

2.	ESC operation lamp blinks when ESC Act.

ESC OFF warning lamp turn on in case of

A.	ESC Switch OFF

B.	ESC Failure Detect

C.	3sec after IGN ON

D.	Entering the diagnostic mode

Bleeding of Brake System

This procedure should be followed to ensure adequate bleeding of air and filling of the ESC unit, brake lines and master cylinder with brake fluid.

Remove the reservoir cap and fill the brake reservoir with brake fluid.

If there is any brake fluid on any painted surface, wash it off immediately.

When pressure bleeding, do not depress the brake pedal.

Recommended fluid........ DOT3 or DOT4

2.	Connect a clear plastic tube to the wheel cylinder bleeder plug and insert the other end of the tube into a half filled clear plastic bottle.

3.	Connect the GDS to the data link connector located underneath the dash panel.

Select and operate according to the instructions on the GDS screen.

(1)	Select vehicle name.

(2)	Select Anti-Lock Brake system.

(3)	Select HCU air bleeding mode.

5.	Pump the brake pedal several times, and then loosen the bleeder screw until fluid starts to run out without bubbles. Then close the bleeder screw (A). [Front] [Rear]

6.	Repeat step 5 until there are no more bubbles in the fluid for each wheel.

Tighten the bleeder screw.

Bleed screw tightening torque:

7.0 ~ 13.0 Nm (0.7 ~ 1.3 kgf.m, 5.4 ~ 9.5 lb-ft)

Schematic Diagrams

ESC connector input/output Connector TerminalSpecificationRemarkNoDescription29IGNITION1(+)High level of wake up voltage :5.0V < V < 16.0VLow level of wake up voltage V < 2.4VMax. curren ...

ESC Control Unit Components and Components Location

Components (1) 1. Front - left tube2. Rear - right tube3. Rear - left tube4. Front - right tube5. MC26. MC17. ESC control module connector8. ESC control module(HECU)9. Damper10. Bracket Componen ...

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