SsangYong Korando III (2010 year). Service manual - part 352

10-8

3) Circuit Diagram

10-9

1413-00

10-10

4) System Operation

Glow plug is installed in the cylinder head. It enhances the cold starting performance and reduces the 

exhaust gas during cold starting.

ECU receives the various signals such as engine rpm, coolant temperature and vehicle speed through 

CAN communication lines. GCU controls the pre-heating, cranking and post-heating operations and 

monitors the glow plug. If GCU detects a problem, it sends the result to ECU.

(2) Operation of AQGS

Duty control area: 

Between 5 and 100%

Frequency: 20 Hz
Duty ratio = (RMS voltage)²
                   (Battery voltage)²

1.

2.

3.

(1) Characteristics of temperature and current in AQGS

AQGS unit increases the glow plug temperature very rapidly (1,000˚C in 2 seconds).

FET (similar to transistor) for each cylinder in AQGS unit pre-heats the glow plug.

If the glow plug temperature reaches to target temperature, the temperature is controlled by 

duty ratio.

1.

2.

3.

AQGS PWM Control

Actual voltage pattern

AQGS unit supplies the power to glow plug.

This shows the voltage and time 

supplied by AQGS by steps. As shown 

on the graph, the supplied voltage is 

decreased as the steps are continued. 

The 3rd step is to keep the temperature, 

not to raise it.

Frequency: 20~33Hz

PWM Control duty ratio

- 1st step: 100%

- 2nd step: 35%

- 3rd step: 23%