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

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 does not operate.

Only when 1. ~ 4. are all normal and the problem is still occurring, replace the HECU.

ABS does not operate intermittently.

Only when 1. ~ 4. are all normal and the problem is still occurring, replace the ABS actuator assembly.

Communication with GDS

is not possible.

(Communication with any system is

not possible)

Communication with GDS

is not possible.

(Communication with ABS only is

not possible)

When ignition key is turned ON

(engine OFF),

the ABS warning lamp does not light up.

Even after the engine is started, the ABS

warning lamp remains ON.

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.

▶ Check the power source circuit.

▶ Erase the DTC and recheck using GDS.

▶ 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 wheel speed sensor circuit.

▶ Repair an open in the wire and ground point.

▶ Check the hydraulic circuit for leakage.

▶ Repair or replace the wheel speed sensor.

▶ The problem is still occurring, replace the ABS control module.

▶ Repair the hydraulic lines for leakage.

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.

▶ Check the wheel speed sensor circuit.

▶ Erase the DTC and recheck using GDS.

▶ Check the stop lamp switch circuit.

▶ Repair or replace the wheel speed sensor.

▶ The problem is still occurring, replace the ABS control module.

▶ Repair the hydraulic lines for leakage.

Possible defect in the power supply system (including ground) for the diagnosis line.

▶ Check the ground circuit for the diagnosis.

▶ Repair an open in the wire. Check and replace fuse (15A) from the engine compartment junction block.

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

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.

▶ Check the power source of ABS control module.

▶ Repair an open in the wire.

▶ 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.

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.

▶ Check the CAN circuit resistance for ABS warning lamp.

▶ Check for blown fuse.

▶ Repair ABS warning lamp bulb or instrument cluster assembly.

▶ Check the CAN circuit wiring for ABS warning lamp.

▶ 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.

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.

▶ Perform the DTC troubleshooting procedure (Refer to DTC troubleshooting).

▶ Check the CAN circuit resistance for ABS warning lamp.

▶ Repair short of wiring between terminal 26, 14 of ABS HECU harness connector and ABS warning lamp module.If no trouble in wiring, inspect again after replacing the ABS HECU.

▶ Repair short of wiring between terminal 26, 14 of ABS HECU harness connector and ABS warning lamp module.If no trouble in wiring, inspect again after replacing the ABS HECU.