SSANGYONG 2004 Rexton 2.7XDi Workshop Manual page 358

Function
Preheating system controls and checks following functions and operating conditions.
• Pre-Heating
: The power will be supplied to the glow plugs by ECU controls when the power is supplied to the IG terminal from
the battery and there are normal communications with ECU within 2 seconds. The surface of glow plug will be
heated up to 850°C very quickly to aid combustion by vaporizing air-fuel mixture during compression stroke.
Preheating time is controlled by ECU.
• While engine starting
: Help to warm up engine
• After-heating
: When the engine is started, after-heating starts by ECU controls. The idle rpm will be increased to reduce toxic
smoke, pollutants and noises.
After-heating time is controlled by ECU.
• Checking glow plugs
- Check each glow plug for short in circuit
- Check each glow plug for open in circuit due to overvoltage
- Check glow plug for short to ground
• Forceful relay shut-down
- When glow plug is shorted to ground
• K-Line communication
- ECU sends the results to preheating time control relay through K-Line to start communication.
- Preheating time control relay sends messages including self-diagnosis data for glow plugs to ECU.
- Glow plug makes communication only as response to demand.
- When power is supplied, ECU starts self-diagnosis within 2 seconds.
- Under the following conditions, communication error occurs.
When there is no response from glow plug module within 2 seconds
When an error is detected in checksum
Less byte is received
Error code of "Pre heating control communication fail" will be reported.
ELECTRIC DEVICES AND SENSORS
DI ENG SM - 2004.4
DI09-15
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN