Hyundai Elantra CN7: ABS(Anti-Lock Brake System)

Seventh generation (CN7; 2021–2024) / Hyundai Elantra CN7 2021-2024 Workshop Manual / Brake System / ABS(Anti-Lock Brake System)

Description and operation

Description

This specification applies to HCU(Hydraulic Control Unit) and ECU(Electronic Control Unit) of the HECU.(Hydraulic and Electronic Control Unit)

This specification is for the wiring design and installation of ABS/ESP ECU.

This unit has the functions as follows.

–	Input of signal from Pressure sensor, Steering angle sensor, Yaw & Lateral G sensor, the wheel speed sensors attached to each wheel.

–	Control of braking force / traction force / yaw moment.

–	Failsafe function.

–	Self diagnosis function.

–	Interface with the external diagnosis tester.

Installation position : engine compartment

–	Brake tube length from Master cylinder port to HECU inlet port should be max. 1m

–	The position should not be close to the engine block and not lower than the wheel.

Operation

The ECU shall be put into operation by switching on the operating voltage (IGN).

On completion of the initialization phase, the ECU shall be ready for operation.

In the operating condition, the ECU shall be ready, within the specified limits (voltage and temperature), to process the signals offered by the various sensors and switches in accordance with the control algorithm defined by the software and to control the hydraulic and electrical actuators.

Wheel Sensor Signal Processing

The ECU shall receive wheel speed signal from the four active wheel sensors.

The wheel signals are converted to voltage signal by the signal conditioning circuit after receiving current signal from active wheel sensors and given as input to the MCU.

Solenoid Valve Control

When one side of the valve coil is connected to the positive voltage that is provided through the valve relay and the other side is connected to the ground by the semiconductor circuit, the solenoid valve goes into operation.

The electrical function of the coils are always monitored by the valve test pulse under normal operation conditions.

Voltage Limits

–	Overvoltage When overvoltage is detected(above 16.9 V), the ECU switches off the valve relay and shuts down the system. When voltage is returned to operating range, the system goes back to the normal condition after the initialization phase.

–	Undervoltage In the event of undervoltage(below 9.4 V), ABS control shall be inhibited and the warning lamp shall be turned on. When voltage is returned to operating range, the warning lamp is switched off and ECU returns to normal operating mode.

Pump Motor Checking

The ECU performs a pump motor test at a speed once after IGN is switched on.

Diagnostic Interface

Failures detected by the ECU are encoded on the ECU, stored in a EEPROM and read out by diagnostic equipment when the ignition switch is turned on.

The diagnosis interface can also be used for testing the ECU during production of the ECU and for actuating the HCU in the test line of manufactories (Air-bleeding line or Roll and Brake Test line).

Warning Lamp Module

ABS Warning Lamp module

The active ABS warning lamp module indicates the self-test and failure status of the ABS.

The ABS warning lamp shall be on :

–	During the initialization phase after IGN ON. (continuously 3 seconds).

–	In the event of inhibition of ABS functions by failure.

–	During diagnostic mode.

–	When the ECU Connector is seperated from ECU.

–	Cluster lamp is ON when communication is impossible with CAN module.

PARKING/EBD warning lamp module

The active EBD warning lamp module indicates the self-test and failure status of the EBD.

However, in case the Parking Brake Switch is turned on, the EBD warning lamp is always turned on regardless of EBD functions.

The EBD warning lamp shall be on :

–	During the initialization phase after IGN ON. (continuously 3 seconds).

–	When the Parking Brake Switch is ON or brake fluid level is low.

–	When the EBD function is out of order.

–	During diagnostic mode.

–	When the ECU Connector is seperated from ECU.

–	Cluster lamp is ON when communication is impossible with CAN module.

ABS Control

NORMAL BRAKING without ABS

Under the normal braking, voltage is not supplied to solenoid valve, inlet valve is opened and outlet valve is closed. When the brake is depressed, brake fluid is supplied to the wheel cylinder via solenoid valve to activate the brake.When the brake is released, brake fluid is back to the master cylinder via inlet valve and check valve.

Solenoid valve	State	Valve	Passage	Pump Motor
Inlet valve (NO)	OFF	Open	Master cylinder ⇔ Wheel cylinder	OFF
Outlet valve (NC)	OFF	Close	Wheel cylinder ⇔ Reservoir	OFF

Dump Mode

Under the emergency braking, if the wheels start to lock up, HECU sends a signal to the solenoid valve to decrease the brake fluid, then voltage is supplied to each solenoid. At this time inlet valve is closed and brake fluid is blocked from the master cylinder. Conversely outlet valve is opened and brake fluid passes through wheel cylinder to reservoir, resulting in pressure decrease.

Solenoid	State	Valve	Passage	Pump Motor
Inlet valve (NO)	ON	Close	Master cylinder ⇔ Wheel cylinder	ON
Outlet valve (NC)	ON	Open	Wheel cylinder ⇔ Reservoir	ON

Hold Mode

When the brake fluid pressure is maximally decreased in wheel cylinder, HECU sends a signal to solenoid valve to keep the fluid pressure, voltage is supplied to inlet valve but it is not supplied to outlet valve. At this time inlet and outlet valves are closed and brake fluid is kept in wheel cylinder.

Solenoid	State	Valve	Passage	Pump Motor
Inlet valve (NO)	ON	Close	Master cylinder ⇔ Wheel cylinder	OFF
Outlet valve (NC)	OFF	Close	Wheel cylinder ⇔ Reservoir	OFF

Increase Mode

If HECU determines there's no lock-up in the wheel, HECU cuts voltage to solenoid valve. So voltage is not supplied to each solenoid valve, brake fluid passes through the inlet valve to wheel cylinder, resulting in pressure increase.

Solenoid	State	Valve	Passage	Pump Motor
Inlet valve (NO)	OFF	Open	Master cylinder ⇔ Wheel cylinder	ON
Outlet valve (NC)	OFF	Close	Wheel cylinder ⇔ Reservoir	ON

ABS HECU External Diagram

Hydraulic System Diagram

Components and components location

Components

1. ABS control module (HECU) 2. Front wheel speed sensor	3. Rear wheel speed sensor 4. ESC OFF switch

Troubleshooting

Standard Flow of Diagnostic Troubleshooting

Notes With Regard To Diagnosis

The phenomena listed in the following table are not abnormal.

Condition

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.

ABS Check Sheet

Problem Symptoms Table

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 GDS is not possible. (Communication with any system is not possible)

1)	Power source circuit

CAN line

Communication with GDS is not possible. (Communication with ABS only is not possible)

1)	Power source circuit

CAN line

HECU

When ignition key is turned ON (engine OFF), the ABS warning lamp does not light up.

1)	ABS warning lamp circuit

HECU

Even after the engine is started, the ABS warning lamp remains ON.

1)	ABS warning lamp circuit

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.

ABS Does Not Operate.

Detecting condition

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 ABS control module.

–	Faulty power source circuit

–	Faulty wheel speed sensor circuit

–	Faulty hydraulic circuit for leakage

–	Faulty HECU

Inspection procedures

DTC Inspection

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

2.	Verify that the DTC code is output.

Is the DTC code output?

	▶ Check the power source circuit.
	▶ Erase the DTC and recheck using GDS.

Check the power source circuit

1.	Disconnect the connector from the ABS control module.

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+

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 ABS control module. Repair if necessary.

Check the ground circuit

1.	Disconnect the connector from the ABS control module.

2.	Check for continuity between terminals 13, 38 of the ABS control module harness side connector and ground point.

Is there continuity?

	▶ Check the wheel speed sensor circuit.
	▶ Repair an open in the wire and ground point.

Check the wheel speed sensor circuit

1.	Refer to the DTC troubleshooting procedures.

Is it normal?

	▶ Check the hydraulic circuit for leakage.
	▶ Repair or replace the wheel speed sensor.

Check the hydraulic circuit for leakage

1.	Refer to the hydraulic lines.

2.	Inspect leakage of the hydraulic lines.

Is it normal?

	▶ The problem is still occurring, replace the ABS control module.
	▶ Repair the hydraulic lines for leakage.

ABS Does Not Opterate (Intermittently).

Detecting condition

Trouble Symptoms

Possible Cause

–	Faulty power source circuit

–	Faulty wheel speed sensor circuit

–	Faulty hydraulic circuit for leakage

–	Faulty HECU

Inspection procedures

DTC Inspection

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

2.	Verify that the DTC code is output.

Is the DTC code output?

	▶ Check the wheel speed sensor circuit.
	▶ Erase the DTC and recheck using GDS.

Check the wheel speed sensor circuit

1.	Refer to the DTC troubleshooting procedures.

Is it normal?

	▶ Check the stop lamp switch circuit.
	▶ Repair or replace the wheel speed sensor.

Check the stop lamp switch circuit

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

Measure the voltage between terminal 23 of the ABS control module harness side connector and body ground when brake pedal is depressed.

Specification : approximately B+

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.

Check the hydraulic circuit for leakage

1.	Refer to the hydraulic lines.

2.	Inspection leakage of the hydraulic lines.

Is it normal?

	▶ The problem is still occurring, replace the ABS control module.
	▶ Repair the hydraulic lines for leakage.

Communication with GDS is not possible.
(Communication with any system in not possible.)

Detecting condition

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

Inspection procedures

Check The Power Supply Circuit For The Diagnosis

Measure the voltage between terminal 16 of the data link connector and body ground.

Specification : approximately B+

Is voltage within specification?

	▶ Check the ground circuit for the diagnosis.
	▶ Repair an open in the wire. Check and replace fuse from the engine compartment junction block.

Check the ground circuit for the diagnosis

1.	Check for continuity between terminal 4 of the data link connector and body ground.

Is there continuity?

▶ Repair an open in the wire between terminal 4 of the data link connector and ground point.

Communication with GDS is not possible.
(Communication with ABS only is not possible.)

Detecting condition

Trouble Symptoms

Possible Cause

When communication with GDS 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

Inspection procedures

Check for Continuity in the CAN Line

1.	Disconnect the connector from the ABS control module.

2.	Check for continuity between terminals 26, 14 of the ABS control module connector and 6, 14 of the data link connector.

Is there continuity?

	▶ Check the power source of ABS control module.
	▶ Repair an open in the wire.

Check the power source of ABS control module

1.	Disconnect the connector from the ABS control module.

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+

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 ABS control module.Repair if necessary.

Check for poor ground

Check for continuity between terminal 4 of the data link connector and ground point.

	▶ Replace the ABS control module and recheck.
	▶ Repair an open in the wire or poor ground

When Ignition Key Is Turned ON (engine OFF), The ABS Warning Lamp Does Not Light Up.

Detecting condition

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 fuse is related to ABS in the engine compartment junction block

–	Faulty ABS warning lamp module

–	Faulty HECU

Inspection procedures

Problem verification

1.	Disconnect the connector from the ABS control module and turn the ignition switch ON.

Does the ABS warning lamp light up?

	▶ Inspectagain after replacing the ABS HECU.
	▶ Check the power source for the ABS warning lamp.

Check the power source for the ABS warning lamp

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

Measure the voltage between terminal (M01-A) 29 of the cluster harness side connector and body ground.

Specification : approximately B+

Is voltage within specification?

	▶ Check the CAN circuit resistance for ABS warning lamp.
	▶ Check for blown fuse.

Check the CAN circuit resistance for ABS warning lamp

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

Measure the resistance between terminal (M01-B) 15 and 16 of the cluster harness side connector.

Specification : 60Ω

Is resistance within specification?

	▶ Repair ABS warning lamp bulb or instrument cluster assembly.
	▶ 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 ABS HECU connector, and then turn the ignition switch OFF.

Check for continuity between terminal (M01-B) 15 of the cluster harness side connector and terminal 26 of ABS HECU harness side.

Check for continuity between terminal (M01-B) 16 of the cluster harness side connector and terminal 14 of ABS HECU harness side.

Specification : Below 1Ω

Is resistance within specification?

	▶ Repair short of wiring between terminal 26, 14 of ABS HECU harness connector and ABS warning lamp module.
	▶ Repair open of wiring between terminal 26, 14 of ABS HECU harness connector and ABS warning lamp module.

Even After The Engine Is Started, The ABS Warning Lamp Remains ON.

Detecting condition

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

Inspection procedures

Check DTC Output

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

2.	Check the DTC output using GDS.

Is DTC output?

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

Check the CAN circuit resistance for ABS warning lamp

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

Measure the resistance between terminal (M01-B) 15 and 16 of the cluster harness side connector.

Specification : 60Ω

Is resistance within specification?

	▶ Repair ABS warning lamp bulb or instrument cluster assembly.
	▶ 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 ABS HECU connector, and then turn the ignition switch OFF.

Check for continuity between terminal (M01-B) 15 of the cluster harness side connector and terminal 26 of ABS HECU harness side.

Check for continuity between terminal (M01-B) 16 of the cluster harness side connector and terminal 14 of ABS HECU harness side.

Specification : Below 1Ω

Is resistance within specification?

	▶ Repair short of wiring between terminal 26, 14 of ABS HECU harness connector and ABS warning lamp module.
	▶ Repair open of wiring between terminal 26, 14 of ABS HECU harness connector and ABS warning lamp module.

Schematic diagrams

Terminal Function

Pin No	Description	Current (AMPS)	Resistance (mΩ)	Remark
1	POS. BATTERY 2. (MOTOR)	40A	10
2	-
3	-
4	-
5	-
6	-
7	P-CAN Low	100 mA	250
8	P-CAN High	100 mA	250
9	SENSOR REAR LEFT POWER	150 mA	250
10	SENSOR REAR RIGHT POWER	150 mA	250
11	SENSOR FRONT RIGHT POWER	150 mA	250
12	SENSOR FRONT LEFT POWER	150 mA	250
13	PUMP MOTOR GROUND	40A	10
14	-
15	-
16	-
17	-
18	-
19	-
20	-
21	SENSOR REAR LEFT GROUND	40 mA	250
22	SENSOR REAR RIGHT GROUND	40 mA	250
23	SENSOR FRONT RIGHT GROUND	40 mA	250
24	SENSOR FRONT LEFT GROUND	40 mA	250
25	BATTERY (+) : SOLENOID	30A	10
26	-
27	-
28	-
29	-
30	BRAKE LIGHT SWITCH	1.2 mA	250
31	-
32	IGN	10 mA	50
33	-
34	ESS DRIVE SIGNAL	1.2 mA	250
35	-
36	-
37	SENSOR FRONT RIGHT OUTPUT	50 mA	250
38	GROUND	30A	10

ESC (Electronic Stability Control) Module

Components and components location

Components

[LHD]

1. Front - right (FR)
2. Rear - left (RL)
3. Rear - right (RR)
4. Front - left (FL)

5. MC2
6. MC1
7. ABS control module (HECU)
8. Bracket

[RHD]

1. Front - right (FR)
2. Rear - left (RL)
3. Rear - right (RR)
4. Front - left (FL)

5. MC2
6. MC1
7. ABS control module (HECU)
8. Bracket

Repair procedures

Removal

[LHD]

1.	Turn ignition switch OFF and disconnect the negative (-) battery cable.

2.	Pull up the lock of the HECU connector and then disconnect the connector (A).

Separate the brake tubes from the HECU by unlocking the nuts (6-ea) couterclockwise using a spanner.

Tightening torque :

12.7 - 16.7 N.m (1.3 - 1.7 kgf.m, 9.4 - 12.3 lb-ft)

Tightening torque :

18.6 - 22.6 N.m (1.9 - 2.3 kgf.m, 13.7 - 16.6 lb-ft)

Loosen the ABS control module mounting nut and then remove the ABS control module (A) from the vehicle.

Tightening torque :

16.7 - 25.5 N.m (1.7 - 2.6 kgf.m, 12.3 - 18.8 lb-ft)

5.	Separate the bracket (B) after remove the mounting bolt from the HECU (A).

[RHD]

1.	Turn ignition switch OFF and disconnect the negative (-) battery cable.

2.	Remove the battery and battery tray. (Refer to Engine Electrical System - "Battery")

3.	Pull up the lock of the HECU connector and then disconnect the connector (A).

Separate the brake tubes from the HECU by unlocking the nuts (6-ea) couterclockwise using a spanner.

Tightening torque :

12.7 - 16.7 N.m (1.3 - 1.7 kgf.m, 9.4 - 12.3 lb-ft)

Tightening torque :

18.6 - 22.6 N.m (1.9 - 2.3 kgf.m, 13.7 - 16.6 lb-ft)

Loosen the ABS control module mounting nut and then remove the ESC control module (A) from the vehicle.

Tightening torque :

16.7 - 25.5 N.m (1.7 - 2.6 kgf.m, 12.3 - 18.8 lb-ft)

6.	Separate the bracket (B) after remove the mounting bolt from the HECU (A).

Installation

1.	To install, reverse the removal procedure.

2.	After installation, bleed the brake system. (Refer to Brake System - "Brake Bleeding Prcoedures")

Adjustment

Perform diagnostic procedure by using diagnostic device as shown below.

1.	Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

2.	Select the "vehicle model" and "ESP/ESC" on GDS vehicle selection screen, then select OK. [Variant Code Reset] [Variant Coding] [Longitudinal G Sensor Calibration]

Front Wheel Speed Sensor

Components and components location

Components

1. Front wheel speed sensor

2. Front wheel speed sensor connector

Repair procedures

Removal

1.	Turn ignition switch OFF and disconnect the negative (-) battery cable.

2.	Loosen the wheel nuts slightly. Raise the vehicle, and make sure it is securely supported.

Remove the rear wheel and tire (A) from the rear hub.

•	Be careful not to damage the hub bolts when removing the front wheel and tire (A).

4.	Remove the front wheel guard. (Refer to Body - "Front Wheel Guard")

5.	Disconnect the front wheel speed sensor connector (A) and then remove the fixing clip (B).

Remove the front wheel speed sensor cable braket bolt (A).

Tightening torque :

7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft)

Remove the wheel speed sensor (A) from the Knuckle after loosening the mounting bolt.

Tightening torque :

7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft)

Installation

1.	To install, reverse the removal procedure.

Inspection

Measure the output voltage between the terminal of the wheel speed sensor and the body ground.

•	In order to protect the wheel speed sensor, when measuring output voltage, a 100Ω resister must be used as shown.

Compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage as shown below.

V_low : 0.59V - 0.84V

V_high : 1.18V - 1.68V

Frequency range : 0.03 - 3,000 Hz

Rear Wheel Speed Sensor

Components and components location

Components

[Rear torsion beam disc brake type]

1. Rear wheel speed sensor

2. Rear wheel speed sensor connector

[Rear multi link disc brake type]

1. Rear wheel speed sensor

2. Rear wheel speed sensor connector

[Rear drum brake type]

1. Rear wheel speed sensor

2. Rear wheel speed sensor connector

Repair procedures

Removal

[Rear torsion beam disc brake type]

1.	Loosen the wheel nuts slightly. Raise the vehicle, and make sure it is securely supported.

Remove the rear wheel and tire (A) from the rear hub.

•	Be careful not to damage the hub bolts when removing the front wheel and tire (A).

3.	Remove the rear brake caliper. (Refer to Brake System - "Rear Disc Brake")

Remove the rear brake disc (A).

Tightening torque :

4.9 - 5.9 N.m (0.5 - 0.6 kgf.m, 3.6 - 4.3 lb-ft)

5.	Disconnect the rear wheel speed sensor connector (A).

Remove the hub bearing assembly (A) after loosening the mounting bolts.

Tightening torque :

49.0 - 58.8 N.m (5.0 - 6.0 kgf.m, 36.2 - 43.4 lb-ft)

[Rear multi link disc brake type]

1.	Loosen the wheel nuts slightly. Raise the vehicle, and make sure it is securely supported.

Remove the rear wheel and tire (A) from the rear hub.

Tightening torque :

107.9 - 127.5 N.m (11.0 - 13.0 kgf.m, 79.6 - 94.0 lb-ft)

•	Be careful not to damage the hub bolts when removing the rear wheel and tire (A).

3.	Remove the rear brake caliper. (Refer to Brake System - "Rear Disc Brake")

Remove the rear brake disc (A) after loosening the mounting screw.

Tightening torque :

4.9 - 5.9 N.m (0.5 - 0.6 kgf.m, 3.6 - 4.3 lb-ft)

5.	Disconnect the rear wheel speed sensor connector (A).

Remove the hub bearing assembly after loosening the hub bearing mounting bolts (A).

Tightening torque :

88.3 - 107.9 N.m (9.0 - 11.0 kgf.m, 65.1 - 79.6 lb-ft)

[Rear drum brake type]

1.	Loosen the wheel nuts slightly. Raise the vehicle, and make sure it is securely supported.

Remove the rear wheel and tire (A) from the rear hub.

•	Be careful not to damage the hub bolts when removing the rear wheel and tire (A).

3.	Disconnect the rear wheel speed sensor connector (A).

4.	Loosen the screw and then remove the rear drum brake (A).

5.	Loosen the hub mounting bolts and then remove the hub (A) from the torsion beam.

Replacement

1.	Remove the rear wheel hub bearing assembly. (Refer to Driveshaft and Axle - "Rear Hub - Carrier")

Fix the rear hub bearing assembly (A) on the vise.

•	When fixing on the vise, use a cloth not to be damaged the hub bearing assembly.

•	Be careful if excessive force for fixing on the vise may damage the hub bearing assembly.

3.	Check the direction of the sensor cap (A).

Remove the sensor cap by hammering on a gap between sensor cap and hub bearing assembly using a scraper (A).

•	In order to widen the gap little by little, hammering around the bearing cap 10-20 times.

•	When removing the sensor cap, remove it in a straight direction not to damage the tone wheel or encoder.

Check if distorted or damaged the tone wheel or encoder (A).

•	Check if damaged the tone wheel or encoder after removing the sensor cap and replace the hub bearing if it was deformed.

•	If the tone wheel is deformed, it may trigger the MIL ON or other problems.

Position the sensor cap to the same direction of sensor cap connector (A) as you checked before removing.

•	Before installing the sensor cap, do not let any foreign material and contaminant into the hub bearing (A) assembly.

Install the sensor cap (A) with the special service tool (09527-AL300).

•	Hammer until there is no gap between the SST and hub bearing assembly and install the sensor cap.

•	Be careful not to tilt to one side when installing the sensor cap as it may damage the tone wheel or encoder.

•	When sensor cap installation, hammering it until the gap disappeared between the sensor cap and hub bearing assembly.

8.	Install the rear wheel hub bearing assembly. (Refer to Driveshaft and Axle - "Rear Hub - Carrier")

Installation

1.	To install, reverse the removal procedure.

Inspection

Measure the output voltage between the terminal of the wheel speed sensor and the body ground.

•	In order to protect the wheel speed sensor, when measuring output voltage, a 100Ω resister must be used as shown.

Compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage as shown below.

V_low : 0.59V - 0.84V

V_high : 1.18V - 1.68V

Frequency range : 1 - 2,500 Hz

ESC (Electronic Stability Control) System

Description and operation Description of ESPESP recognizes critical driving conditions, such as panic reactions in dangerous situations, and stabilizes the vehicle by wheel-individual braking and e ...

Body (Interior and Exterior)

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