Kia Sedona (2008 year). Instruction — part 23

HECU's connector or was repaired and HECU memory was not cleared. Thoroughly check
connectors for looseness, poor connection, bending, corrosion, contamination.

NO



Go to TERMINAL & CONNECTOR INSPECTION procedure.

TERMINAL & CONNECTOR INSPECTION

Refer to DTC C1102.

SIGNAL CIRCUIT INSPECTION

1. Ignition "ON" & Engine "OFF".

2. Press the brake pedal.

3. Measure voltage between the terminal "30" of the HECU harness connector and chassis ground.

Specification: Brake Switch - Approx. B+

Fig. 58: Measuring Voltage Between Terminal HECU Harness Connector And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.

4. Is the measured voltage within specifications?

YES



Fault is intermittent caused by open or short harness in brake light switch, inoperative brake lamp
switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting
procedure.

NO



Check for open or blown 15 A STOP fuse referring to "Circuit Diagram". Check for damaged
harness and poor connection in the power harness between the battery terminal (+) and the terminal
"30" of the HECU harness connector. Repair as necessary and then go to "VERIFICATION OF
VEHICLE REPAIR" procedure. If OK, Go to "COMPONENT INSPECTION" Procedure.

2008 Kia Sedona

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

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Saturday, May 22, 2010 6:52:42 PM

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COMPONENT INSPECTION

1. Connect a ohmmeter to the connector of brake light switch, and check whether or not there is continuity

when the plunger of the brake light switch is pushed in and when it is released. The switch is in good
condition if there is no continuity when the plunger is pushed

2. Is there no continuity when the plunger is pushed?

YES



Fault is intermittent caused by open harness in brake light switch line, inoperative brake lamp
switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting
procedure.

NO



Substitute with a known-good brake lamp switch and check for proper operation. If problem is
corrected, replace brake light switch and then go to "VERIFICATION OF VEHICLE REPAIR"
procedure.

Fig. 59: Checking Plunger Continuity Of Brake Switch
Courtesy of KIA MOTORS AMERICA, INC.

VERIFICATION OF VEHICLE REPAIR

Refer to DTC C1101.

DTC C1604 ECU HARDWARE ERROR

COMPONENT LOCATION

Refer to DTC C1235.

GENERAL DESCRIPTION

2008 Kia Sedona

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

Microsoft

Saturday, May 22, 2010 6:52:42 PM

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© 2006 Mitchell Repair Information Company, LLC.

The HECU is composed of an ECU (Electronic Control Unit) and a HCU (Hydraulic Control Unit), HCU is
composed of a source of hydraulic pressure and modulator valve block. Increase and decrease of hydraulic
pressure is operated by electronic motor, According to a detected signal by wheel speed sensor, The hydraulic
pressure which is needed for control is supplied by pump. The HCU' function which is composed of a
accumulator, return pump, solenoid valve is to increase, decrease or maintain the hydraulic pressure supplied to
a brake caliper by operating return pump according to HECU control signal while ABS control is active.

DTC DESCRIPTION

The HECU monitors the operation of the IC components such as memory, register, A/D converter and so on.
The ECU sets this code when the EEPROM data read by the master processor is different than prior data
written, or when the master/slave processor detects abnormal operation in RAM, Status Register, Interrupt,
Timer, A/D converter or cycle time.

DTC DETECTING CONDITION

DTC DETECTING CONDITION CHART

COMPONENT INSPECTION

Item

Detecting Condition

Possible cause

DTC strategy



Internal monitoring



Inoperative HECU

Case 1

Monitoring Period



Continuous

Enable Conditions



If Internal control unit
failures of the
master/slave processor or
peripheral integrated
circuits is detected.

Case 2

Monitoring Period



Directly after ignition on,
during reading of
EEPROM-values

Enable Conditions



Failure is set if checksum
not correct or PSW-
EEPROM-Handler
reported unknown failure
during EEPROM-value
reading.



If EEPROM reading
sequence take longer then
3 s, a failure is set.

Fail Safe



The ABS/EBD/ESC
functions are inhibited.



The ABS/EBD/ESC
warning lamps are
activated.

2008 Kia Sedona

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

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Saturday, May 22, 2010 6:52:42 PM

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Refer to DTC C1101.

VERIFICATION OF VEHICLE REPAIR

Refer to DTC C1101.

DTC C1605 CAN HARDWARE ERROR

COMPONENT LOCATION

Refer to DTC C1235.

GENERAL DESCRIPTION

The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and TCS control
requests, to the PCM (ECM & TCM) through CAN bus line. The PCM (ECM) performs fuel cut functions
according to requests from the HECU and retards ignition timing by torque reduction requests. The PCM
(TCM) maintains current gear positions during TCS control time, in order not to increase power which causes a
Kickdown shift.

DTC DESCRIPTION

The HECU checks the CAN control module for normal TCS control, and sets this code if CAN control module
malfunction is detected.

DTC DETECTING CONDITION

DTC DETECTING CONDITION CHART

COMPONENT INSPECTION

Item

Detecting Condition

Possible cause

DTC strategy



CAN control module
monitoring



Inoperative HECU

Monitoring Period



Immediate during start up

Enable Conditions



Faults are detected
immediately if the
initialization software can't
have write access to the
configuration registers of
the CAN-controller module.

Fail Safe



Inhibit the ESC control and
ABS/EBD control is
available. Meanwhile, stop
checking the ESC switch
failure under the ESC
control.

2008 Kia Sedona

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

Microsoft

Saturday, May 22, 2010 6:52:42 PM

Page 92

© 2006 Mitchell Repair Information Company, LLC.