SsangYong Korando III (2010 year). Service manual - part 353

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(3) Operating Steps

Pre-Glow: Step 1

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If normal communication with the ECU is established 2 seconds after the power is supplied to the IGN 

terminal from the battery, the GCU supplies the battery power to raise the temperature of the glow plug 
to 1000℃ by the preheating request from the engine ECU before starting.

- The time for pre-heating is controlled by the ECU.

If the input voltage (VB) is 11.5 V or less, GCU supplies the battery voltage for preheating time (T1).

If the input voltage (VB) is greater than 11.5 V, GCU supplies the voltage of 11.5 V for preheating time 

(T1).

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The preheating time may vary according to the conditions.

Input voltage 

VB (V)

Pre-heating time T1 

(sec)

6 8.27 

7 5.8 

8 4.1 

9 3.15 

10 2.4 

11 1.95 

≥ 11.5 

1.9 

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During cranking: Step 2 and step 3

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Step 2: If the ECU receives the cranking signal after pre-heating (step 1), the GCU supplies the 
voltage of 6.8 V for 1 sec to raise the temperature to 1,100℃.
Step 3: The GCU supplies the voltage of 5.1 V to keep the temperature at 1,000°C.

1.

2.

Under fixed temperature: The AQGS unit supplies power for 30 seconds (Step 1 + Step 3) if no 

cranking signal is received after the step 1.

During cranking: The step 3 is started after the step 2.

*

*

Post-glow: Step 4:

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The post-heating is for reducing HC/CO after the engine is started. If the time for post-heating exceeds 

180 sec., the GCU unit cuts off the power to each glow plug even if there is preheating request from the 

engine ECU.

Emergency glow

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If no CAN signal is received for 4 seconds from the engine ECU after the IGN ON signal is input, the 

GCU performs emergency preheating (Step 3) for 30 seconds.

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Normal operating mode

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This shows the components of preheating system in the pre-heating and the post-heating steps.

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When there is no engine cranking signal after turning the ignition key ON

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