Kia Carnival (2007 year). Instruction — part 235

c. Stop lamp switch circuit.

d. Check the hydraulic circuit for leakage.

Communication with Scan tool is not possible.
(Communication with any system is not possible)

a. Power source circuit

b. Diagnosis line

Communication with Scan tool is not possible.
(Communication with ABS only is not possible)

a. Power source circuit

b. Diagnosis line

c. HECU

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

a. ABS warning lamp circuit

b. HECU

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

a. ABS warning lamp circuit

b. 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.

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.

a. Inoperative power source circuit

b. Inoperative wheel speed sensor circuit

c. Inoperative hydraulic circuit for leakage

d. Inoperative HECU

INSPECTION PROCEDURES

DTC INSPECTION

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

2. Verify that the system is operating to specifications.

Is the system operating to specifications?

▶ Check the power source circuit.

▶ Erase the DTC and recheck using Scan Tool.

CHECK THE POWER SOURCE CIRCUIT.

1. Disconnect the connector from the ABS control module.

2. Turn the ignition switch ON, measure the voltage between terminal 18 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.

control module. Repair if necessary.

CHECK THE GROUND CIRCUIT.

1. Disconnect the connector from the ABS control module.

2. Check for continuity between terminals 1,4 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.

Refer to the DTC troubleshooting procedures.
Is the system operating to specifications?

▶ Check the hydraulic circuit for leakage.

▶ Repair or replace the wheel speed sensor.

CHECK THE HYDRAULIC CIRCUIT FOR LEAKAGE.

Refer to the hydraulic lines.
Inspect leakage of the hydraulic lines.
Is the system operating to specifications?

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

▶ Replace the leaking hydraulic lines.

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

a. Inoperative power source circuit

b. Inoperative wheel speed sensor circuit

DTC is displayed, check the following probable cause. When the
problem is still occurring, replace the ABS control module.

b. Inoperative wheel speed sensor circuit

c. Inoperative hydraulic circuit for leakage

d. Inoperative HECU

INSPECTION PROCEDURES

DTC INSPECTION

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

2. Verify that the system is operating to specifications.

Is the system operating to specifications?

▶ Check the wheel speed sensor circuit.

▶ Erase the DTC and recheck using Scan Tool.

CHECK THE WHEEL SPEED SENSOR CIRCUIT.

Refer to the DTC troubleshooting procedures.
Is the system operating to specifications?

▶ 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.

2. Measure the voltage between terminal 20 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.

Refer to the hydraulic lines.
Inspect leakage of the hydraulic lines.
Is the system operating to specifications?

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

▶ Replace the leaking hydraulic lines.

DETECTING CONDITION

Trouble Symptoms

Possible Cause

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

a. An open in the wire

b. Poor ground

c. Inoperative power source circuit

INSPECTION PROCEDURES

CHECK THE POWER SUPPLY CIRCUIT FOR THE DIAGNOSIS
Measure the voltage between terminal 9 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 (15A) from the engine compartment junction block.

CHECK THE GROUND CIRCUIT FOR THE DIAGNOSIS

Check for continuity between terminal 5 of the data link connector and body ground.
Is there continuity?

▶ Repair an open in the wire between terminal 5 of the data link connector and ground point.

DETECTING CONDITION

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

a. An open in the wire