SsangYong Stavic / SsangYong Rodius (2005 year). Service manual - part 150

DI09-12

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EFFECTIVE DATE

AFFECTED VIN

 ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.9

1. Disconnect the negative battery cable.

2. Disconnect the starter terminal.

3. Lift up the vehicle and remove the front propeller shaft

mounting bolts.

4. Remove the upper and lower mounting bolts.

Removal and Installation

5. Install in the reverse order of removal.

DI09-13

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EFFECTIVE DATE

AFFECTED VIN

ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.9

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

Coolant

temperature

sensor

DI09-14

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EFFECTIVE DATE

AFFECTED VIN

 ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.9

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. 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.

- The ECU will attempt to read the diagnostic information 2 seconds after power up.

- Under the following conditions, communication error occurs.

When there is no response from glow plug module within 50 milli-second after request of ECU.

When an error is detected in checksum

Less byte is received

Error code of “Pre heating control communication fail” will be reported.

DI09-15

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AFFECTED VIN

ELECTRIC DEVICES AND SENSORS

DI ENG SM - 2004.9

PREHEATING TIME RELAY

Structure

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

Glow plug control

signal

(ECU 113)

IG1 power

terminal

K-LINE #1

(ECU 34)

Glow plug terminal

#1 ~ #5

B+ main

wire (12V)

Ground

terminal