Kia Carnival (2009+). Instruction — part 136

Engine Electrical System

Cruise Control System

Engine Electrical System

2009 > G 3.8 DOHC >

SYSTEM BLOCK DIAGRAM

COMPONENT PARTS AND FUNCTION OUTLINE

Component part

Function

Vehicle-speed sensor

Converts vehicle speed to pulse.

Engine control module (ECM)

Receives signals from sensor and control switches;

Cruise control indicator

Illuminate when CRUISE main switch is ON (Built into
cluster)

Cruise Control switches

CRUISE main switch

Switch for automatic speed control power supply.

Resume/Accel switch

Controls automatic speed control functions by
Resume/Accel switch (Set/Coast switch)

Set/Coast switch

Cancel switch

Cancel switch

Sends cancel signals to ECM

Brake-pedal switch

Transaxle range switch
(A/T)
Clutch switch (M/T)

ETS motor

Regulates the throttle valve to the set opening by ECM.

* ETS : Electronic Throttle System

CRUISE CONTROL

Cruise control system is engaged by "ON. OFF" main switch located on right of steering wheel column. System has
the capability to cruise, coast, resume speed, and accelerate, and raise "tap-up" or lower "tap-down" set speed.
It also has a safety interrupt, engaged upon depressing brake or shifting select lever.
ECM is a speed control system that maintains a required vehicle speed at normal driving conditions.
The main components of cruise control system are mode control switches, transaxle range switch, brake switch,
vehicle speed sensor, ECM and ETS motor that connect throttle body.

vehicle speed sensor, ECM and ETS motor that connect throttle body.
ECM contains a low speed limit which will prevent system engagement below a minimum speed of 40km/h (25mph).
The operation of the controller is controlled by mode control switches located on steering wheel.
Transaxle range switch and brake switch are provided to disengage the cruise control system. The switches are on
brake pedal bracket and transaxle. When the brake pedal is depressed or select lever shifted, the cruise control
system is electrically disengaged and the throttle is returned to the idle position.
Cruise main switch
Cruise control system is engaged by pressing "ON. OFF" push button. Releasing "ON.OFF" push button release
throttle, clears cruise memory speed, and puts vehicle in a non-cruise mode.
Coast/Set switch
COAST.SET switch located on right of steering wheel column has two positions - "Normal" and "Depressed". The set
position - With COAST.SET switch depressed and then released the cruise speed will be set at the speed the vehicle
was going when COAST.SET switch was released. The coast position - With COAST.SET switch fully depressed,
driver can lower cruise speed. To decrease cruise speed, COAST.SET switch is held in, disengaging cruise control
system. When vehicle has slowed to required cruise speed, releasing COAST.SET switch will re-engage speed at new
selected speed.
The tap down - To lower vehicle speed, cruise must be engaged and operating. Tap down is done by quickly pressing
and releasing COAST.SET switch. Do not hold COAST.SET switch in depressed position.
Tap down is a function in which cruise speed car be decreased by 1mph (1.6km/h)
Resume/Accel switch
RES.ACCEL switch located on right of steering wheel column has two positions - "Normal" and "Depressed".
The resume position - With RES.ACCEL switch depressed and then release, this switch also returns cruise control
operation to last speed (Which is temporarily disengaged by Cancel switch or Brake pedal), setting when momentarily
operating RES.ACCEL switch by constant acceleration.
The accel position - With RES.ACCEL switch depressed and held in, disengaging cruise control system, when vehicle
has accelerated to required cruise speed, releasing RES.ACCEL switch will re-engage speed at new selected speed.
The tap up - To increase vehicle speed, the cruise must be engaged and operating.
Tap up is done by quickly pressing and releasing RES.ACCEL switch less than 0.5 second. Do not hold RES.ACCEL
switch in depressed position. Tap up is a function in which cruise speed can be increased by 1mph (1.6km/h).
Cancel switch
Cruise control system is temporarily disengaged by pressing "CANCEL" switch.
Cruise speed canceled by this switch will be recovered by RES.ACCEL switch

2009 > G 3.8 DOHC >

TROUBLE SYMPTOM CHARTS

TROUBLE SYMPTOM 1

TROUBLE SYMPTOM 2

Trouble symptom

Probable cause

Remedy

The set vehicle speed varies greatly
upward or downward
"Surging" (repeated alternating
acceleration and deceleration) occurs
after setting

Malfunction of the vehicle speed
sensor circuit

Repair the vehicle speed sensor
system, or replace the part

Malfunction of ECM

Replace the ECM

TROUBLE SYMPTOM 3

Trouble symptom

Probable cause

Remedy