SsangYong Musso. Manual - part 411

1E3-2  OM600 ENGINE ELECTRICAL

Preheating System

General information

The preheating system consists of control, coolant temperature
sensor and glow plugs.

!

Control relay - preheating time.

!

Coolant temperature sensor.

!

Glow plug.

GLOW PLUG

1 Wiring Harness
2 Nut .............................................................. 4 Nm

3 Wire Terminal
4 Glow Plug

MAINTENANCE AND REPAIR

ON-VEHICLE SERVICE

OM600 ENGINE ELECTRICAL  1E3-3

1. Preheating time - control relay.

Control relay functions as followings :

!

Switching of preheating current.

!

Indication of preheating finish.

!

Control of preheating sequence.

!

Indication of fault.

2. Coolant temperature sensor.

Coolant temperature sensor senses coolant’s temperature
and signals it to the preheating relay continuously.

3. Glow plug

The  glow plug parts are housing with M12 ´ 1.25 thread
and heating pin in housing. It is connected in a parallel circuit
with the specified voltage of 11.5V.

The heating element has a heating coil and a control coil
and they are connected in series.

1. Control Coil
2. Heater Coil

4. Current and temperature of glow plug

!

Current of glow plug

While the preheating system operates, current of about

30A flows in each glow plug and temperature of heating
coil rises very fast.

Due to the rise of temperature, the resistance of control

coil increases therefore the current is controlled to

about 8~15A and that protects the glow plug from over-

heating.

!

Temperature of glow plug

The temperature of the glow plug reaches up to 900°C

after about 9 seconds and up to 1,050°C after 30
seconds.

1E3-4  OM600 ENGINE ELECTRICAL

Preheating System Operation

1. Preheating before start.

Preheating time is different by coolant temperature and it is
on until the glow indicator light goes off.

2. Preheating after start.

Preheating continues for max. 60 seconds to rise in
characteristic of warming-up on engine after starting too.

3. Monitoring on glow plug.

Glow plugs are monitored by low current by the micro
processor in control relay respectively while running the
engine.

If glow indicator comes on after starting for about one minute,
it indicates on or several plugs are faulty.

Possible Cause

-

One or several glow are faulty

Problem

Glow indicator does not come on in preheating
time and comes on after starting the engine.

Glow indicator does not come on while
preheating and after starting engine.

Glow indicator does not come on and engine’s
starting is difficult or does not start at all.

Glow indicator comes on after starting for
about one minute.

1

2

3

4

-

Faulty glow indicator

-

Faulty circuit of glow indicator

-

Faulty control relay

-

Circuits short in one or several glow plugs

-

Faulty preheating circuits

-

Faulty control relay

-

One or several glow plugs are faulty

OM600 ENGINE ELECTRICAL  1E3-5

Removal & Installation Procedure

1. Disconnect the negative terminal of battery.

2. Remove the nut (2).

3. Remove the glow plug (4).

4. Install the glow plug (4).

5. Tighten the nut (2).

Tightening Torque

20 Nm

Tightening Torque

4 Nm