Kia Sedona (2008 year). Instruction — part 28

The HECU monitors the operation of the valves by checking the drive circuit of the solenoid valves, and then
sets this code when the unexpected drive voltage is detected. For example, the HECU sets the DTC if the
electrical feedback signal does not match the actuation signal for the corresponding valve.

DTC DETECTING CONDITION

DTC DETECTING CONDITION CHART

Item

Detecting Condition

Possible cause

DTC strategy



Voltage monitoring

Case 1

Monitoring Period



Continuous

Enable Conditions



The electrical feedback
signal does not match the
actuation signal for the
corresponding valve for
more than 30 ms.



Current controlled
valves and under
voltage conditions:
detection time is 80
ms

Case 2

Monitoring Period



Immediately after power on



every 20 s



The Test is canceled
if any control, valve
actuation takes place
or if the Vehicle is in
motion and the BLS is
on.

Enable Conditions



A Fault is found if UVR is
not within 0.1*battery
voltage < valve relay
voltage < 0.8*battery
voltage



A Fault is found if valve
relay voltage > or =
0.2*battery voltage.



After that all valves
are switched on
sequential, valve relay
voltage and valve
feedback is measured.

Monitoring Period



The Valve and Pump motor
Test is performed once after

2008 Kia Sedona

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

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Case 3

ignition on if vehicle speed
is > = 15 km/h.



Inoperative HECU

Enable Conditions



The valve and pump motor
test detects electrical
actuation malfunction of
ABS valves. The test
actuates all valves in series
(to detect short cuts or
shunts between the valve
lines). Faults are detected if
there is an error during the
test.

Case 4

Monitoring Period



The drift test executes only
once during an ignition
Cycle. The test is triggered
if the following conditions
are fulfilled: 10min after
power up or end of control

1. No BLS is applied

2. Brake pressure is < 10

bar

3. Vehicle speed > 15

km/h

4. Vehicle acceleration >

0.5 m/s

2

5. Supply voltage > 11

volts.

Enable Conditions



The drift test is executed
only once during an ignition
Cycle. If it detects partly
shorted valve coils, almost
inoperative coils or
malfunction of the valve
driver, a failure is
recognized.

Fail Safe



Valve cannot be actuated or
valve is incorrectly actuated.
This may result in locked
wheels or wheels without
pressure.



ABS/EBD/ESC function is
prohibited.



ABS/EBD/ESC warning

2008 Kia Sedona

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

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MONITOR ACTUATION TEST

1. Connect scan tool to Data Link Connector (DLC)

2. Ignition "ON" & Engine "OFF".

3. Select the "Actuation Test" mode on the scan tool.

4. Inspect operating status of inlet valve with Actuation Test.

Specification: It's normal if operating sound is heard.

Fig. 67: Scan Tool Display - Actuation Test
Courtesy of KIA MOTORS AMERICA, INC.

5. Does a inlet valve operate normally?

YES



Fault is intermittent caused by inoperative valve or was repaired and HECU memory was not
cleared. Go to the applicable troubleshooting procedure.

NO



Go to "COMPONENT INSPECTION" procedure.

COMPONENT INSPECTION

1. Ignition "OFF".

2. Engine "ON".

3. Start and drive vehicle in gear and maintain vehicle speed at or above 15 km/h(9 mph).

lamp is turned ON.

2008 Kia Sedona

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

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4. Does warning lamp remain On?

YES



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

NO



Fault is intermittent caused by inoperative HECU or was repaired and HECU memory was not
cleared. Go to the applicable troubleshooting procedure.

VERIFICATION OF VEHICLE REPAIR

Refer to DTC C1101.

DTC C2312 FL OUTLET VALVE MALFUNCTION; DTC C2320 FR OUTLET VALVE
MALFUNCTION; DTC C2328 RL OUTLET VALVE MALFUNCTION; DTC C2336 RR OUTLET
VALVE MALFUNCTION

COMPONENT LOCATION

Refer to DTC C1235.

GENERAL DESCRIPTION

Refer to DTC C2308.

DTC DESCRIPTION

Refer to DTC C2308.

DTC DETECTING CONDITION

Refer to DTC C2308.

MONITOR ACTUATION TEST

1. Connect scan tool to Data Link Connector (DLC)

2. Ignition "ON" & Engine "OFF".

3. Select the "Actuation Test" mode on the scan tool.

4. Inspect operating status of inlet valve with Actuation Test.

Specification: It' s normal if operating sound is heard.

2008 Kia Sedona

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

Microsoft

Saturday, May 22, 2010 6:52:43 PM

Page 112

© 2006 Mitchell Repair Information Company, LLC.