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.

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)

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.

4.

Initial checkup is made in the following cases. (1) When the failure is not detected now (2) When ABS and ESC are not in control. (3) Initial checkup is not made after ECU power on. (4) If the vehicle speed is over 5 mph(8 km/h) when the brake lamp switch is off. (5) When the vehicle speed is over 24.8 mph(40 km/h).

5.	Though, it keeps on checkup even if the brake lamp switch is on.

6.	When performing ABS or ESC control before the initial checkup, stop the initial checkup and wait for the HECU power input again.

7.	Judge failure in the following cases. (1) When the power is normal. (2) From the point in which the vehicle speed reaches 4.9 mph(8 km/h) after HECU power on.

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.

1.	ABS warning lamp turns on when ABS is fail.

2.	ESC operation lamp turns on and ESC OFF warning lamp blinks when ESC is fail.

1.	Turn the ignition switch OFF.

2.	Connector the scan tool to the 16P data link connector located the driver'd side kick panel.

3.	Turn the ignition switch ON.

4.	Check for diagnostic trouble using the scan tool.

5.	After completion trouble of the repair or correction of the problem, erase the stored fault codes the clear key on the scan tool.

6.	Disconnect the scan tool from the 16P data link connector.

Phenomenon	Explanation
System check sound	When starting the engine, a thudding sound can sometimes be heard coming from inside the engine compartment. This is because the system operation check is being performed.
ABS operation sound	1. Sound of the motor inside the ABS hydraulic unit operation (whine). 2. Sound is generated along with vibration of the brake pedal (scraping). 3. When ABS operates, sound is generated from the vehicle chassis due to repeated brake application and release (Thump : suspension; squeak: tires)
ABS operation (Long braking distance)	For road surfaces such as snow-covered and gravel roads, the braking distance for vehicles with ABS can sometimes be longer than that for other vehicles. Accordingly, advise the customer to drive safely on such roads by lowering the vehicle speed.
Diagnosis detection conditions can vary depending on the diagnosis code. When checking the trouble symptom after the diagnosis code has been erased, ensure that the requirements listed in "Comment" are met.

Symptom	Suspect Area
ABS does not operate.	Only when 1. -4. are all normal and the problem is still occurring, replace the HECU. 1. Check the DTC reconfirming that the normal code is output. 2. Power source circuit. 3. Speed sensor circuit. 4. Check the hydraulic circuit for leakage.
ABS does not operate intermittently.	Only when 1. -4. are all normal and the problem is still occurring, replace the ABS actuator assembly. 1. Check the DTC reconfirming that the normal code is output. 2. Wheel speed sensor circuit. 3. Stop lamp switch circuit. 4. Check the hydraulic circuit for leakage.
Communication with Scan tool is not possible. (Communication with any system is not possible)	1. Power source circuit 2. Diagnosis line
Communication with Scan tool is not possible. (Communication with ABS only is not possible)	1. Power source circuit 2. Diagnosis line 3. HECU
When ignition key is turned ON (engine OFF), the ABS warning lamp does not light up.	1. ABS warning lamp circuit 2. HECU
Even after the engine is started, the ABS warning lamp remains ON.	1. ABS warning lamp circuit 2. HECU

During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent the wheels from locking and is not an abnormality.

Trouble Symptoms	Possible Cause
Brake operation varies depending on driving conditions and road surface conditions, so diagnosis can be difficult.However if a normal DTC is displayed, check the following probable cause. When the problem is still occurring, replace the ESC control module.	- Faulty power source circuit - Faulty wheel speed sensor circuit - Faulty hydraulic circuit for leakage - Faulty HECU

1.	Connect the scan tool with the data link connector and turn the ignition switch ON.

2.	Verify that the normal code is output.

3.	Is the normal code output? ▶ Check the power source circuit. ▶ Erase the DTC and recheck using scan tool.

1.	Disconnect the connector from the ESC control module.

2.	Turn the ignition switch ON, measure the voltage between terminal 31 of the ESC control module harness side connector and body ground. Specification: approximately B+

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

1.	Disconnect the connector from the ESC control module.

2.	Check for continuity between terminals 45, 46 of the ESC control module harness side connector and ground point.

3.	Is there continuity? ▶ Check the wheel speed sensor circuit. ▶ Repair an open in the wire and ground point.

1.	Refer to the DTC troubleshooting procedures.

2.	Is it normal? ▶ Check the hydraulic circuit for leakage. ▶ Repair or replace the wheel speed sensor.

1.	Refer to the hydraulic lines.

2.	Inspect leakage of the hydraulic lines.

3.	Is it normal? ▶ The problem is still occurring, replace the ESC control module. ▶ Repair the hydraulic lines for leakage.

Trouble Symptoms	Possible Cause
Brake operation varies depending on driving conditions and road surface conditions, so diagnosis can be difficult. However if a normal DTC is displayed, check the following probable cause. When the problem is still occurring, replace the ESC control module.	- Faulty power source circuit - Faulty wheel speed sensor circuit - Faulty hydraulic circuit for leakage - Faulty HECU

1.	Connect the scan tool with the data link connector and turn the ignition switch ON.

2.	Verify that the normal code is output.

3.	Is the normal code output? ▶ Check the wheel speed sensor circuit. ▶ Erase the DTC and recheck using scan tool.

1.	Refer to the DTC troubleshooting procedures.

2.	Is it normal? ▶ Check the stop lamp switch circuit. ▶ Repair or replace the wheel speed sensor.

1.	Check that stop lamp lights up when brake pedal is depressed and turns off when brake pedal is released.

2.	Measure the voltage between terminal 34 of the ESC control module harness side connector and body ground when brake pedal is depressed. Specification : approximately B+

3.	Is the voltage within specification? ▶ Check the hydraulic circuit for leakage. ▶ Repair the stop lamp switch. Repair an open in the wire between the ABS control module and the stop lamp switch.

1.	Refer to the hydraulic lines.

2.	Inspection leakage of the hydraulic lines.

3.	Is it normal? ▶ The problem is still occurring, replace the ESC control module. ▶ Repair the hydraulic lines for leakage.

Trouble Symptoms	Possible Cause
Possible defect in the power supply system (including ground) for the diagnosis line.	- An open in the wire - Poor ground - Faulty power source circuit

1.	Measure the voltage between terminal 9 of the data link connector and body ground. Specification : approximately B+

2.	Is voltage within specification? ▶ Check the ground circuit for the diagnosis. ▶ Repair an open in the wire. Check and replace fuse (15A) from the engine compartment junction block.

1.	Check for continuity between terminal 5 of the data link connector and body ground.

2.	Is there continuity? ▶ Repair an open in the wire between terminal 5 of the data link connector and ground point.

Trouble Symptoms	Possible Cause
When communication with scan tool is not possible, the cause may be probably an open in the HECU power circuit or an open in the diagnosis output circuit.	- An open in the wire - Faulty HECU - Faulty power source circuit

1.	Disconnect the connector from the ESC control module.

2.	Check for continuity between terminals 13 of the ESC control module connector and 1 of the data link connector.

3.	Is there continuity? ▶ Check the power source of ESC control module. ▶ Repair an open in the wire.

1.	Disconnect the connector from the ESC control module.

2.	Turn the ignition switch ON, measure the voltage between terminal 31 of the ESC control module harness side connector and body ground. Specification : approximately B+

3.	Is voltage within specification? ▶ Check for poor ground. ▶ Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ESC control module.Repair if necessary.

1.	Check for continuity between terminal 5 of the data link connector and ground point. ▶ Replace the ESC control module and recheck. ▶ Repair an open in the wire or poor ground

Trouble Symptoms	Possible Cause
When current flows in the HECU the ABS warning lamp turns from ON to OFF as the initial check.Therefore if the lamp does not light up, the cause may be an open in the lamp power supply circuit, a blown bulb, an open in the both circuits between the ABS warning lamp and the HECU, and the faulty HECU.	- Faulty ABS warning lamp bulb - Blown No.2 fuse (10A) in the engine compartment junction block - Faulty ABS warning lamp module - Faulty HECU

1.	Disconnect the connector the ABS HECU and turn the ignition switch ON.

2.	Does the ABS waring lamp light up? ▶ Check the power source for the ABS warning lamp. ▶ Inspect again after replacing the ABS HECU.

1.	Disconnect the instrument cluster connector (M01-C) and turn the ignition switch ON.

2.	Measure the voltage between terminal (M01-C) 11 of the cluster harness side connector and body ground. Specification : approximately B+

3.	Is voltage within specification? ▶ Check the CAN circuit resistance for ABS warning lamp. ▶ Check for blown fuse.

1.	Disconnect the instrument cluster connector (M01-B) and turn the ignition switch OFF.

2.	Measure the resistance between terminal (M01-B) 10 and 11 of the cluster harness side connector. Specification : 60Ω

3.	Is resistance within specification? ▶ Check the CAN circuit wiring for ABS warning lamp. ▶ Check the CAN circuit wiring for ABS warning lamp.

1.	Disconnect the instrument cluster connector (M01-B) and ESC HECU connector, and then turn the ignition switch OFF.

2.	Check for continuity between terminal (M01-B) 10 of the cluster harness side connector and terminal 14 of ESC HECU harness side. Check for continuity between terminal (M01-B) 11 of the cluster harness side connector and terminal 15 of ESC HECU harness side. Specification : Below 1Ω

3.	Is resistance within specification? ▶ Repair short of wiring between terminal 14, 15 of ESC HECU harness connector and ABS warning lamp module. ▶ Repair open of wiring between terminal 14, 15 of ESC HECU harness connector and ABS warning lamp module.

Trouble Symptoms	Possible Cause
If the HECU detects trouble, it lights the ABS warning lamp while at the same time prohibiting ABS control. At this time, the HECU records a DTC in memory.Even though the normal code is output, the ABS warning lamp remains ON, then the cause may be probably an open or short in the ABS warning lamp circuit.	- An open in the wire - Faulty instrument cluster assembly - Faulty ABS warning lamp module - Faulty HECU

1.	Connect the scan tool to the 16P data link connector located behind the driver's side kick panel.

2.	Check the DTC output using scan tool.

3.	Is DTC output? ▶ Perform the DTC troubleshooting procedure (Refer to DTC troubleshooting). ▶ Check the CAN circuit resistance for ABS warning lamp.

1.	Disconnect the instrument cluster connector (M01-B) and turn the ignition switch OFF.

2.	Measure the resistance between terminal (M01-B) 10 and 11 of the cluster harness side connector. Specification : 60Ω

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

1.	Disconnect the instrument cluster connector (M01-B) and ESC HECU connector, and then turn the ignition switch OFF.

2.	Check for continuity between terminal (M01-B) 10 of the cluster harness side connector and terminal 14 of ESC HECU harness side. Check for continuity between terminal (M01-B) 11 of the cluster harness side connector and terminal 15 of ESC HECU harness side. Specification : Below 1Ω

3.

Is resistance within specification? ▶ Repair short of wiring between terminal 14 ,15 of ESC HECU harness connector and ABS warning lamp module. If no trouble in wiring, inspect again after replacing the ABS HECU. ▶ Repair open of wiring between terminal 14 ,15 of ESC HECU harness connector and ABS warning lamp module.

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 scan tool to the data link connector located underneath the dash panel.

4.

Select and operate according to the instructions on the scan tool screen. You must obey the maximum operating time of the ABS motor with the scan tool to prevent the motor pump from burning. (1) Select vehicle name. (2) Select Anti-Lock Brake system. (3) Select air bleeding mode. (4) Press "YES" to operate motor pump and solenoid valve. (5) Wait 120 sec. before operating the air bleeding. (If not, you may damage the motor.) (6) Perform the air bleeding.

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.

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: 6.86 ~ 12.74 N.m (0.7 ~ 1.3 kgf.m, 5.09 ~ 9.45 lb-ft)

Diagnostic Trouble Code Chart(DTC)

DTC code	Trouble description	Warning lamp condition
		EBD	ABS	ESC
C1101	Battery Voltage High	●	●	●
C1102	Battery Voltage Low	○/●	●	●
C1112	Sensor Power Voltage	○	●	●
C1200	Wheel Speed Sensor Front-LH Open/Short	○/●	●	●
C1201	Wheel Speed Sensor Front-LH Range / Performance / Intermittent	○/●	●	●
C1202	Wheel Speed Sensor Front-LH Invalid/no Signal	○/●	●	●
C1203	Wheel Speed Sensor Front-RH Open/Short	○/●	●	●
C1204	Wheel Speed Sensor Front-RH Range / Performance / Intermittent	○/●	●	●
C1205	Wheel Speed Sensor Front-RH Invalid/no Signal	○/●	●	●
C1206	Wheel Speed Sensor Rear-LH Open/Short	○/●	●	●
C1207	Wheel Speed Sensor Rear-LH Range / Performance / Intermittent	○/●	●	●
C1208	Wheel Speed Sensor Rear-LH Invalid/no Signal	○/●	●	●
C1209	Wheel Speed Sensor Rear-RH Open/Short	○/●	●	●
C1210	Wheel Speed Sensor Rear-RH Range / Performance / Intermittent	○/●	●	●
C1211	Wheel Speed Sensor Rear-RH Invalid/no Signal	○/●	●	●
C1235	Primary Pressure Sensor-Electrical	○	○	●
C1237	Primary Pressure Sensor-Signal	○	○	●
C1259	Steering Angle Sensor - Electrical	○	○	●
C1260	Steering Angle Sensor-Signal	○	○	●
C1274	Longitudinal G Sensor Open/Short	○	●	●
C1275	Longitudinal G Sensor Range/Performance error	○	●	●
C1282	Yaw Rate & Lateral G Sensor-Electrical	○	○	●
C1283	Yaw Rate & Lateral G Sensor-Signal	○	○	●
C1503	ESC Switch Error	○	○	●
C1513	Brake Switch Error	○	○	●
C1604	ECU Hardware Error	○	○	●
C1605	CAN Hardware Error	○	○	●
C1611	CAN Time-out ECM	○	○	●
C1612	CAN Time-out TCM	○	○	●
C1613	CAN Wrong Message	○	○	●
C1616	CAN Bus off	○	○	●
C1647	Sensor CAN Hardware Error	●	●	●
C2112	Valve Relay Error	○	○	●
C2227	Excessive Temperature Of Brake Disc	●	●	●
C2380	ABS / ESC Valve Malfunction	○	●	●
C2402	Motor Electrical	○	●	●