SsangYong Rexton. Manual - part 70

DI06-29

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Y220_06068

PREHEATING SYSTEM

Preheating relay

Glow plug

ECU

Glow indicator (meter cluster)

DI06-30

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

K

R/Y

Y220_06069

OVERVIEW

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

- Glow indicator

• 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

PREHEATING RELAY

Structure

K-LINE #1

(ECU 34)

IG1

Power terminal

Glow plug

control signal

(ECU 113)

Ground terminal

B+main wire

(12V)

STICS terminal

(remote start)

Glow plug

terminal

DI06-31

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Y220_06070

PREHEATING SYSTEM DIAGRAM

Specifications

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

STICS(remote start)

Coolant

temperature

sensor

DI06-32

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

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.

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 “P1720 - Pre heating control communication fail” will be reported.

Operating time

Pre-

heating

Coolant Temp.

Operating Time

• IG: “ON”

• B+ : below 15.2V

Release

Conditions

• After operating time elapsed

• IG: “OFF”  • When engine cranking

• After engine starting

After-

heating

Glow

Indicator

-35 °C

-25 °C

-20  °C

-10 °C

0 °C

10 °C

20 °C

Coolant Temp.

Operating Time

Coolant Temp.

Operating Time

• After operating time elapsed

• Torque : 190/170 Nm

• Speed: 2100/2050 rpm

• When engine cranking

Release

Conditions

• IG: “ON”

31 sec

22 sec

19 sec

17 sec

14 sec

0 sec

0 sec

-30 °C

115 sec

-30 °C

18 sec

-20 °C

80 sec

-25 °C

16 sec

-10 °C

30 sec

-20 °C

10 sec

0 °C

19 sec

-10 °C

5 sec

10 °C

11 sec

0 °C

2 sec

20 °C

11 sec

10 °C

0 sec

35 °C

0 sec

20 °C

0 sec

Operating

Conditions

Operating

Conditions

Operating

Conditions

Release

Conditions