Kia Cee'd Quiz
Brake System

Troubleshooting

In this manual: Brake System
General Information — 15Maintenance — 7Engine Mechanical System — 84Engine Electrical System — 49Emission Control System — 22Fuel System — 95Clutch System — 28Manual Transmission — 21Dual Clutch Transmission (DCT) System — 47Drive Shaft and Axle — 20Suspension System — 36Steering — 23Restraints — 39Brake System — 54Body (Interior and Exterior) — 209Body Electrical System — 254Heating, Ventilation, and Air Conditioning — 56
46steps
~276min
5/5difficulty
Done 0 of 46
Standard Diagnostic Troubleshooting Flow
Notes on Diagnosis. The phenomena listed in the following table are not abnormal.
Phenomenon Description
System Check Sound When the engine is started, a dull knocking sound may sometimes be heard
from the engine compartment. This is because the system
performs a self-check.
ABS Operation Sound
  1. A motor sound (whining) can be heard inside the ABS hydraulic unit.
  2. A grinding sound is generated together with brake pedal vibration.
  3. When the ABS is operating, the noise comes from the vehicle chassis due to repeated depressing and releasing of the brake pedal. (Knocking: suspension; squeaking: tires)
ABS Operation (Longer Stopping Distance) On road surfaces such as snow-covered and gravel roads, the braking distance of vehicles equipped with ABS may sometimes be longer than that of other vehicles. Therefore, advise the customer to drive safely on such roads by reducing vehicle speed.
Diagnostic detection conditions may differ depending on the diagnostic trouble code. When checking the symptom after the
diagnostic trouble code has been erased, make sure the requirements listed in "Comment" are met.

ABS Checklist
Symptom Table
Symptom Suspect area
ABS does not operate. Only when steps 1 through 4 are normal and the problem still occurs, replace the HECU.
  1. Check the DTC to confirm that a normal code is output.
  2. Power supply circuit.
  3. Speed sensor circuit.
  4. Check the hydraulic circuit for leaks.
ABS does not operate intermittently. Only when steps 1 through 4 are normal and the problem still occurs, replace the ABS hydraulic unit assembly.
  1. Check the DTC to confirm that a normal code is output.
  2. Wheel speed sensor circuit.
  3. Stop lamp switch circuit.
  4. Check the hydraulic circuit for leaks.
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 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 condition
Symptom Condition Possible Cause
Brake operation depends on driving conditions and road surface conditions, so diagnosis may be difficult. However, if a normal trouble code is displayed, check the following possible causes. If the problem still occurs, replace the ABS control unit.
  • Faulty power supply circuit
  • Faulty wheel speed sensor circuit
  • Faulty hydraulic circuit due to leakage
  • Faulty HECU

Inspection Procedures. Check DTC.
  1. Connect the GDS to the data link connector and turn the ignition switch ON.
  2. Make sure a DTC is output. Is a DTC output?
 ▶ Check the power supply circuit.
▶ Erase the trouble code and repeat the inspection using GDS.

Check the power supply circuit.
  1. Disconnect the connector from the ABS control module.
  2. Turn the ignition switch ON. Measure the voltage between terminal 32 of the ABS control module wiring harness side connector and body ground.

    Specification: Approximately B+

    Is the voltage within specification?
 ▶ Check the ground circuit.
▶ Check the harness or connector between the fuse (10A) in the engine compartment relay box and the ABS control module. Repair if necessary.

Check the ground circuit.
  1. Disconnect the connector from the ABS control module.
  2. Check the continuity between terminals 13 and 38 of the ABS control module harness side connector and the body ground point. Is there continuity?
 ▶ Check the wheel speed sensor circuit. Refer to the circuit diagram.
▶ Repair the open circuit in the wire between the connector and the body ground point.

Check the wheel speed sensor circuit.
  1. Check the wheel speed sensor circuit. (Refer to the DTC troubleshooting procedure.) Is it normal?
 ▶ Check the hydraulic circuit for leakage.
▶ Repair or replace the wheel speed sensor.

Check the hydraulic circuit for leaks.
  1. Check the hydraulic lines for leakage. Is it normal?
 ▶ If the problem persists, replace the ABS control module.
▶ Repair the hydraulic lines for leakage.

Detection condition
Symptom Condition Possible Cause
Brake operation depends on driving conditions and road surface conditions, so diagnosis may be difficult. However, if a normal trouble code is displayed, check the following possible causes. If the problem still occurs, replace the ABS control unit.
  • Faulty power supply circuit
  • Faulty wheel speed sensor circuit
  • Faulty hydraulic circuit due to leakage
  • Faulty HECU

Inspection Procedures. Check DTC.
  1. Connect the GDS to the data link connector and turn the ignition switch ON.
  2. Make sure a DTC is output. Is a DTC output?
 ▶ Check the wheel speed sensor circuit. Refer to the circuit diagram.
▶ Erase the trouble code and repeat the inspection using GDS.

Check the wheel speed sensor circuit.
  1. Refer to the DTC troubleshooting procedures. Is it normal?
 ▶ Check the stop lamp switch. Refer to the circuit diagram.
▶ Repair or replace the wheel speed sensor.

Check the hydraulic circuit for leaks.
  1. Check the hydraulic lines for leakage. Is it normal?
 ▶ If the problem persists, replace the ABS control module.
▶ Repair the hydraulic lines for leakage.

Detection condition
Symptom Condition Possible Cause
A possible malfunction exists in the power supply (including ground) circuit for the diagnostic line.
  • Open in the wire
  • Poor ground
  • Faulty power supply circuit

Inspection Procedures. Check the power supply circuit for diagnosis.
  1. Measure the voltage between terminal 16 of the data link connector and body ground.

    Specification: Approximately B+

    Is the voltage within specification?
 ▶ Check the ground circuit for diagnosis.
▶ Repair the open circuit in the wire. Check and replace the fuse (15A) in the engine compartment relay box.

Check the ground circuit for diagnosis.
  1. Check the continuity between terminal 4 of the data link connector and body ground. Is there continuity?
 ▶ Repair the open circuit in the wire between terminal 4 of the data link connector and the body ground point.

Detection condition
Symptom Condition Possible Cause
If communication with the 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 in the wire
  • Faulty HECU
  • Faulty power supply circuit

Inspection Procedures. Check the CAN line integrity.
  1. Disconnect the connector from the ABS control module.
  2. Check the continuity between terminals 26 and 14 of the ABS control module connector and terminals 6 and 14 of the data link connector. Is there continuity?
 ▶ Check the power supply to the ABS control module.
▶ Repair the open circuit wire.

Check the power supply to the ABS control module.
  1. Disconnect the connector from the ABS control module.
  2. Turn the ignition switch ON. Measure the voltage between terminal 32 of the ABS control module wiring harness side connector and body ground.

    Specification: Approximately B+

    Is the voltage within specification?
 ▶ Check for a poor ground connection.
▶ Check the harness or connector between the fuse (10A) in the engine compartment relay box and the ABS control module. Repair if necessary.

Check for a poor ground connection.
  1. Check the continuity of the circuit between terminal 4 of the data link connector and the ground point.
    		 ▶ Replace the ABS control module and recheck.
    		▶ Repair the open in the wire or the poor ground connection.

Detection condition
Symptom Condition Possible Cause
When current flows through the HECU, the ABS warning lamp turns off.
Turn the ignition switch to OFF for the initial check. Therefore, if the lamp does not illuminate,
the cause may be an open in the lamp power supply circuit, a burned-out bulb,
an open in both circuits between the ABS warning lamp and the
HECU, or a faulty HECU.
  • Faulty ABS warning lamp bulb
  • The blown fuse is related to the ABS in the engine compartment junction block.
  • Faulty ABS warning lamp module
  • Faulty HECU

Inspection Procedures. Check the problem.
  1. Disconnect the connector from the ABS control module and turn the ignition ON.
  2. Does the ABS warning lamp illuminate?
    		 ▶ Recheck after replacing the ABS HECU.
    		▶ Check the power supply to the ABS warning lamp.
  3. Disconnect the instrument cluster (M01) connector and turn the ignition switch ON.
  4. Measure the voltage between terminal 39 of the instrument cluster (M01) harness side connector and body ground.

    Specification: Approximately B+

    Is the voltage within specification?
Check the power supply to the ABS warning lamp.
 ▶ Check the CAN circuit resistance for the ABS warning lamp.
▶ Check whether the fuse is blown.

Check the resistance of the ABS warning lamp CAN circuit.
  1. Disconnect the instrument cluster (M01) connector and turn the ignition switch OFF.
  2. Measure the resistance between terminals 23 and 24 of the instrument cluster (M01) harness side connector.

    Specification: 60 Ω

Is the resistance within specification?
 ▶ Repair the ABS warning lamp or replace the instrument cluster assembly.
▶ Check the CAN circuit and the ABS warning lamp wiring.

Check the wiring of the ABS warning lamp CAN circuit.
  1. Disconnect the instrument cluster (M01) connector and the ABS HECU connector, then turn the ignition switch OFF.
  2. Check the continuity between terminal 23 of the instrument cluster (M01) harness side connector and terminal 26 of the ABS HECU harness side connector. Check the continuity between terminal 24 of the instrument cluster (M01) harness side connector and terminal 14 of the ABS HECU harness side connector.

    Specification: Less than 1 ohm

    Is the resistance within specification?
 ▶ Repair the short circuit in the wiring between terminals 26 and 14 of the ABS HECU harness connector and the ABS warning lamp module.
▶ Repair the open circuit in the wiring between terminals 26 and 14 of the ABS HECU harness connector and the ABS warning lamp module.

Detection condition
Symptom Condition Possible Cause
If the HECU detects a malfunction, it turns on the ABS warning lamp and
simultaneously disables ABS control. At this time, the HECU stores the
DTC in memory. Even though a normal code is output, if the ABS
warning lamp remains on, the cause may be an open or short circuit
in the ABS warning lamp circuit.
  • Open in the wire
  • Faulty instrument cluster assembly
  • Faulty ABS warning lamp module
  • Faulty HECU

Inspection Procedures. Check the DTC output.
  1. Connect the GDS to the 16-pin data link connector located behind the driver's side kick panel.
  2. Check the DTC output using GDS. Is a DTC displayed?
 ▶ Perform the DTC troubleshooting procedure (refer to DTC troubleshooting).
▶ Check the CAN circuit resistance for the ABS warning lamp.

Check the resistance of the ABS warning lamp CAN circuit.
  1. Disconnect the instrument cluster (M01) connector and turn the ignition switch OFF.
  2. Measure the resistance between terminals 23 and 24 of the instrument cluster (M01) harness side connector.

    Specification: 60 Ω

    Is the resistance within specification?
    		 ▶ Repair the ABS warning lamp or replace the instrument cluster assembly.
    		▶ Check the CAN circuit and the ABS warning lamp wiring.
  3. Disconnect the instrument cluster (M01) connector and the ABS HECU connector, then turn the ignition switch OFF.
  4. Check the continuity between terminal 23 of the instrument cluster (M01) harness side connector and terminal 26 of the ABS HECU harness side connector. Check the continuity between terminal 24 of the instrument cluster (M01) harness side connector and terminal 14 of the ABS HECU harness side connector.

    Specification: Less than 1 ohm

    Is there continuity?
Check the wiring of the ABS warning lamp CAN circuit.
 ▶ Repair the short circuit in the wiring between terminals 26 and 14 of the ABS HECU harness connector and the ABS warning lamp module. If there are no wiring problems, recheck after replacing the ABS HECU.
▶ Repair the short circuit in the wiring between terminals 26 and 14 of the ABS HECU harness connector and the ABS warning lamp module. If there are no wiring problems, recheck after replacing the ABS HECU.

Test yourself

A quick Kia Cee'd quiz: every answer comes with an explanation and a link to the manual page.