Hyundai Tucson Quiz
Braking System

Troubleshooting

In this manual: Braking System
General Information — 17Engine Mechanical System — 51Engine Electrical System — 26Emission Control System — 23Engine/Fuel Control System — 44Clutch System — 12MANUAL TRANSMISSION SYSTEM — 12AUTOMATIC TRANSMISSION SYSTEM — 42Four-Wheel Drive (4WD) System — 14Drive Shaft and Axle — 22Suspension System — 30Steering System — 16Restraint — 21Braking System — 47Body Work (Interior and Exterior) — 145Body Electrical System — 162Heating, Ventilation and Air Conditioning — 39
76steps
~456min
5/5difficulty
Done 0 of 76
Standard Troubleshooting Form
Diagnostic Notes: The phenomena listed in the table below are not abnormal.
Condition EXPLANATION
System Check Audible Warning When the engine is started, a loud noise may sometimes be heard
from inside the engine compartment. This is caused by the system
self-check operation being completed.
ABS Operation Noise
  1. A noise from the motor located inside the ABS hydraulic unit (hissing).
  2. A sound is heard and the brake pedal begins to vibrate (scraping noise).
  3. When ABS operates, sounds from the vehicle chassis may be heard due to repeated brake application and release (knocking: suspension; squealing: tires).
ABS Operation (Longer Stopping Distance) On snow-covered or gravel roads, the braking distance of a vehicle equipped with ABS may sometimes be longer than for other vehicles. Accordingly, advise the customer to drive carefully and reduce vehicle speed on such surfaces.
Diagnostic conditions may vary depending on the trouble code.
If the DTC was erased, make sure the conditions meet the requirements specified in the "Comments".

ABS Order Form
DIAGNOSTIC SYMPTOM TABLE
Symptom Suspected Area
ABS does not operate. Only if items 1~4 are all normal and the problem still persists, replace the HECU.
  1. CHECK THE TROUBLE CODE AGAIN BY CONFIRMING THE OUTPUT CODE IS NORMAL.
  2. Power supply circuit
  3. Speed sensor circuit.
  4. CHECK THAT THE HYDRAULIC CIRCUIT HAS NO LEAKAGE.
ABS operates intermittently. Only if items 1~4 are all normal and the problem still persists, replace the ABS hydraulic unit/pump assembly.
  1. CHECK THE TROUBLE CODE AGAIN BY CONFIRMING THE OUTPUT CODE IS NORMAL.
  2. Wheel speed sensor circuit
  3. Stop lamp switch circuit
  4. CHECK THAT THE HYDRAULIC CIRCUIT HAS NO LEAKAGE.
Communication with GDS
is not possible.
(Communication with any system
is not possible)
  1. Power supply circuit
  2. CAN line
Communication with GDS
is not possible.
(Communication with ABS only
is not possible)
  1. Power supply circuit
  2. CAN line
  3. HECU
When the ignition switch is turned ON
(engine OFF),
the ABS warning lamp does not illuminate
  1. ABS warning lamp circuit
  2. HECU
Even after starting the engine, the ABS
warning lamp remains illuminated
  1. ABS warning lamp circuit
  2. HECU

Detection Conditions
Symptom Inspection Possible Cause
Brake operation depends on driving and road conditions. Therefore, diagnosis may be difficult. However, if a normal trouble code is displayed, check the following possible causes. If the problem persists, replace the ABS control module.
  • Faulty power supply circuit
  • Faulty wheel speed sensor circuit
  • Hydraulic circuit malfunction due to leakage
  • Faulty HECU

INSPECTION PROCEDURES: CHECK WHEEL SPEED SENSOR
  1. Connect the GDS to the diagnostic connector and turn the ignition switch ON.
  2. Make sure that a DTC is output.
  3. Is a DTC output?
    		 ▶ Check the power supply circuit.
    		▶ Erase the trouble code and check again using the GDS.
  4. Disconnect the ABS control module connector.
  5. Turn the ignition switch ON, measure the voltage between terminal 29 of the ABS control module harness-side connector and body ground.

    Specification: Approximately B+

  6. Is the voltage within specification?
    		 ▶ Check the ground circuit.
    		▶ Check the harness wire or connector between the fuse (10 A) in the engine compartment junction block and the ABS control module. Repair as necessary.
  7. Disconnect the ABS control module connector.
  8. Check the continuity between terminals 13 and 38 of the ABS control module harness-side connector and the ground point.
  9. Is there continuity?
    		 ▶ Check the wheel speed sensor circuit.
    		▶ Repair the open circuit in the wiring and the ground points.
  10. Refer to DTC troubleshooting procedures.
  11. Is this normal?
    		 ▶ Make sure the hydraulic circuit has no leakage.
    		▶ Repair or replace the wheel speed sensor.
  12. Refer to hydraulic lines.
  13. Check for leakage in the hydraulic lines.
  14. Is this normal?
    		 ▶ If the problem persists, replace the ABS control module.
    		▶ Eliminate leakage from the hydraulic lines.
CHECK POWER SUPPLY CIRCUIT. CHECK GROUND CIRCUIT. Check the wheel speed sensor circuit. Make sure the hydraulic circuit has no leaks. Detection Conditions
Symptom Inspection Possible Cause
Brake operation depends on driving and road conditions. Therefore, diagnosis may be difficult. However, if a normal trouble code is displayed, check the following possible causes. If the problem persists, replace the ABS control module.
  • Faulty power supply circuit
  • Faulty wheel speed sensor circuit
  • Hydraulic circuit malfunction due to leakage
  • Faulty HECU

INSPECTION PROCEDURES: CHECK WHEEL SPEED SENSOR
  1. Connect the GDS to the diagnostic connector and turn the ignition switch ON.
  2. Make sure that a DTC is output.
  3. Is a DTC output?
    		 ▶ Check the wheel speed sensor circuit.
    		▶ Erase the trouble code and check again using the GDS.
  4. Refer to DTC troubleshooting procedures.
  5. Is this normal?
    		 ▶ Check the stop lamp switch circuit.
    		▶ Repair or replace the wheel speed sensor.
  6. Make sure the stop lamp illuminates when the brake pedal is depressed and goes off when the brake pedal is released.
  7. Measure the voltage between terminal 23 of the ABS control module harness-side connector and body ground while the brake pedal is depressed.

    Specification: Approximately B+

  8. Is the voltage within specification?
    		 ▶ Make sure the hydraulic circuit has no leakage.
    		▶ Repair the stop lamp switch. Eliminate any open in the wiring between the ABS control module and the stop lamp switch.
  9. Refer to hydraulic lines.
  10. Check for leakage in the hydraulic lines.
  11. Is this normal?
    		 ▶ If the problem persists, replace the ABS control module.
    		▶ Eliminate leakage from the hydraulic lines.
Check the wheel speed sensor circuit. Check the stop lamp switch circuit. Make sure the hydraulic circuit has no leaks. Detection Conditions
Symptom Inspection Possible Cause
Probable failure of the power supply (including ground) of the diagnostic line.
  • Open circuit in wiring
  • Poor ground
  • Faulty power supply circuit

INSPECTION PROCEDURES: CHECK DIAGNOSTIC POWER SUPPLY CIRCUIT
  1. Measure the voltage between terminal 16 of the data link connector and body ground.

    Specification: Approximately B+

  2. Is the voltage within specification?
    		 ▶ Check the diagnostic ground circuit.
    		▶ Repair the open circuit in the wiring. Check and replace the fuse and junction block in the engine compartment.
  3. Check the continuity between terminal 4 of the data link connector and body ground.
  4. Is there continuity?
    		 ▶ Repair the open circuit in the wiring between terminal 4 of the data link connector and the ground point.
CHECK DIAGNOSTIC CIRCUIT GROUND. Detection Conditions
Symptom Inspection Possible Cause
If communication with GDS is not possible, the cause may be an open in the HECU power supply circuit or an open in the diagnostic output circuit.
  • Open circuit in wiring
  • Faulty HECU
  • Faulty power supply circuit

INSPECTION PROCEDURES: Check the CAN line for continuity.
  1. Disconnect the ABS control module connector.
  2. Check the continuity between terminals 26, 14 of the control module connector and terminals 3, 11 of the data link connector.
  3. Is there continuity?
    		 ▶ Check the power supply of the ABS control module.
    		▶ Repair the open circuit in the wiring.
  4. Disconnect the ABS control module connector.
  5. Turn the ignition switch ON, measure the voltage between terminal 29 of the ABS control module harness-side connector and body ground.

    Specification: Approximately B+

  6. Is the voltage within specification?
    		 ▶ Make sure the ground is not faulty.
    		▶ Check the harness wire or connector between the fuse (10 A) in the engine compartment junction block and the ABS control module. Repair if necessary.
  7. Check the continuity between terminal 4 of the data link connector and the ground point.
    		 ▶ Replace the ABS control module and check again.
    		▶ Repair the open circuit in the wiring or the faulty ground.

CHECK ABS CONTROL MODULE POWER SUPPLY. CHECK THAT THE GROUND IS GOOD. Detection Conditions
Symptom Inspection Possible Cause
When power is supplied to the HECU, the ABS warning lamp illuminates
for the initial check. Therefore, if the lamp does not illuminate,
the cause may be an open in the warning lamp power supply circuit, a burned-out bulb,
an open in the two circuits between the ABS warning lamp and
the HECU, or a faulty HECU
  • Faulty ABS warning lamp bulb
  • Blown fuse linked to ABS in the engine compartment junction block
  • Faulty ABS warning lamp module
  • Faulty HECU

INSPECTION PROCEDURES: CONFIRM THE CONCERN
  1. Disconnect the ABS control module connector and turn the ignition switch ON.
  2. Does the ABS warning lamp illuminate?
    		 ▶ Check again after replacing the ABS HECU.
    		▶ Check the power supply of the ABS warning lamp.
  3. Disconnect the instrument cluster connector (M08) and turn the ignition switch ON.
  4. Measure the voltage between terminal 39 of the instrument cluster (M08) harness-side connector and body ground.

    Specification: Approximately B+

  5. Is the voltage within specification?
    		 ▶ Check the resistance of the ABS warning lamp CAN circuit.
    		▶ Check the fuse.
  6. Disconnect the instrument cluster connector (M08) and turn the ignition switch OFF.
  7. Measure the resistance between terminals 32 and 33 of the instrument cluster (M08) harness-side connector.

    Specification: 60 Ω

  8. Is the resistance within specification?
    		 ▶ Secure the ABS warning lamp bulb or the entire instrument cluster.
    		▶ Check the ABS warning lamp CAN wiring circuit.
  9. Disconnect the instrument cluster connector (M08) and the ABS HECU connector, then turn the ignition switch OFF.
  10. Check the continuity between terminal 32 of the instrument cluster (M08) harness-side connector and terminal 26 of the ABS HECU harness-side connector. Check the continuity between terminal 33 of the instrument cluster (M08) harness-side connector and terminal 14 of the ABS HECU harness-side connector.

    Specification: Less than 1 ohm

  11. Is the resistance within specification?
    		 ▶ Repair the short to ground between terminals 26, 14 of the ABS HECU harness connector and the ABS warning lamp module.
    		▶ Repair the short to ground between terminals 26, 14 of the ABS HECU harness connector and the ABS warning lamp module.
CHECK ABS WARNING LAMP POWER SUPPLY. Check the resistance of the ABS warning lamp CAN circuit. Check the wiring of the ABS warning lamp CAN circuit. Detection Conditions
Symptom Inspection Possible Cause
If the HECU detects a problem, it turns on the ABS warning lamp, which
prevents the ABS from operating at the same time. At this point, the HECU stores
the trouble code in memory. Although the normal code is output,
the ABS warning lamp remains illuminated. The cause may be an
open or short circuit in the ABS warning lamp circuit.
  • Open circuit in wiring
  • Faulty instrument cluster assembly
  • Faulty ABS warning lamp module
  • Faulty HECU

INSPECTION PROCEDURES: CHECK DTC OUTPUT
  1. Connect the GDS to the 16-pin data link connector located behind the instrument panel cover on the driver's side.
  2. Check the DTC output using the GDS.
  3. Is a DTC output?
    		 ▶ Perform the DTC troubleshooting procedure. (Refer to Troubleshooting - DTC)
    		▶ Check the resistance of the ABS warning lamp CAN circuit.
  4. Disconnect the instrument cluster connector (M08) and turn the ignition switch OFF.
  5. Measure the resistance between terminals 32 and 33 of the instrument cluster (M08) harness-side connector.

    Specification: 60 Ω

  6. Is the resistance within specification?
    		 ▶ Repair the ABS warning lamp bulb or the entire instrument cluster.
    		▶ Check the wiring of the ABS warning lamp CAN circuit.

  7. Disconnect the instrument cluster connector (M08) and the ABS HECU connector, then turn the ignition switch OFF.
  8. Check the continuity between terminal 32 of the instrument cluster (M08) harness-side connector and terminal 26 of the ABS HECU harness-side connector. Check the continuity between terminal 33 of the instrument cluster (M08) harness-side connector and terminal 14 of the ABS HECU harness-side connector.

    Specification: Less than 1 ohm

  9. Is the resistance within specification?
    		 ▶ Repair the short to ground between terminals 26, 14 of the ABS HECU harness connector and the ABS warning lamp module.
    		▶ Repair the short to ground between terminals 26, 14 of the ABS HECU harness connector and the ABS warning lamp module.
Check the resistance of the ABS warning lamp CAN circuit. Check the wiring of the ABS warning lamp CAN circuit.

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