Hyundai Tucson: ESC(Electronic stability system) System / Troubleshooting
| 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)
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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.
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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. |
| 3. |
ESC OFF warning lamp turn on in case of
| D. |
Entering the diagnostic mode |
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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.
| 1. |
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. |
| 4. |
Select and operate according to the instructions on the GDS screen.
| (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. 
|
| 7. |
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)
|
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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 ...
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 ...
Schematic Diagrams
ESC Control Unit Components and Components Location