SsangYong Rexton. Manual - part 97

DI09-14

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AFFECTED VIN

 ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.4

PREHEATING SYSTEM

General

Glow plug is installed on the cylinder head (combustion chamber) in the D27DT preheating control unit system. Cold
starting performance has improved and exhaust gas during cold starting has reduced.

ECU receives coolant temperature and engine speed to control; after monitoring the engine preheating/after heating and
glow plug diagnosis function, the fault contents will be delivered to ECU.

• Engine preheating/after heating functions

• Preheating relay activation by ECU controls

- Senses engine temperature and controls the preheating/after heating time

- Preheating warning light

• K-LINE for information exchanges between preheating unit and ECU

- Transmits preheating unit self-diagnosis results to ECU

- Transmits glow plug diagnosis results and operating status to ECU

Y220_09012

Coolant

temperature

sensor

STICS (remote start)

DI09-15

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AFFECTED VIN

ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.4

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.

DI09-16

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EFFECTIVE DATE

AFFECTED VIN

 ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.4

PREHEATING TIME RELAY

Structure

Specifications

Y220_09013

Description

Rated voltage

Operating voltage range

Operating range

Relay operating voltage

Relay releasing voltage

Relay coil resistance

Voltage drop

Parasitic current

Specification

DC 12 V

DC 8 ~ 15 V

- 40 ~ + 100°C

Over 6.5 V

Over 1.5 V

11.3 

Ω

Below 150 mV at each glow plug (at 16A of current)

Max. 1mA

Glow plug control

signal

(ECU 113)

IG1 power

terminal

K-LINE #1

(ECU 34)

Glow plug terminal

#1~ #4 , #5

B+ main

wire (12V)

Ground
terminal

Relay signal output (5V)

to RESTICS

DI09-17

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EFFECTIVE DATE

AFFECTED VIN

ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.4

GLOW PLUG

Cylinder type glow plug is inserted into the cylinder and com-
posed of heating pin and housing.

There are heating coil and control coil in the heating pin and
those coils located inside of ceramic cover turn ON or OFF
the internal switch.

Purposes of use

- Preheating before engine starting

- During engine starting

- After-heating after engine starting

Y220_09014

Specifications

Description

Rated voltage

Current consumption

Preheating time

(From ambient temperature up to 85°C)

Operating temperature

Tightening torque

Specification

11 ± 0.1 V

Initial current I 

intial

 < 30.0 A

T 

850°C

 = 5 ± 1.5 sec.

900 °C

15 + 3 Nm

Trouble Code

Refer to “Diagnosis” section in this manual.

Conditions for glow plugs

- Prompt heating and secured temperature stabilities (temperature changes) in low operating voltage

- Should not exceed permissible max. temperature under max. operating voltage

- Heating pin should have good heat-resisting properties against combustion gas and durability

- Material of the glow plug should meet high stressing conditions (e.g., temperature, vibration and environmental

factors)