2012 SSANGYONG NEW REXTON Service Manual

2. SPECIAL SERVICE TOOL
Name Description
Glow plug remover
Tool for removing the glow plug from cylinder head

0000-00
Glow Plug
1. LAYOUT OF PRE-GLOW SYSTEM
The pre-glow system in D20DT engine has four glow plugs. And, the terminal T for pre-glow completion
signal is not used since the remote start function has been deleted.
Tightening torque
Engine ECUPre-glow Indicator
(Instrument cluster)
Ground
terminal
Pre-glow control
signal (ECU 113)IG1 power
terminal
Not available for the
vehicle without
remote start functionGlow plug
terminals
(#1~#4)
K-Line
(ECU 34)
G5 terminal
deleted
Battery
main
cable
Glow Plug Control Relay

Circuit Diagram
Specifications
Description Specification
Rated voltage DC 12V
Operating voltage DC 8~15V
Operating temperature
Relay operating voltage Over 6.5V
Relay OFF voltage OVER 1.5v
Relay coil resistance
Voltage drop Below 150Mv in each glow plug (Current: 16A)
Parasitic current Max. 1mA

0000-00
2. OPERATION
Glow plug is installed in the cylinder head. It enhances the cold starting performance and reduces the
exhaust gas during cold starting.
1. Pre-heating
2. Post-heating during engine running If normal communication with the ECU is established 2 seconds after the power is supplied to the IGN
terminal from the battery, the ECU supplies the battery voltage to glow plugs.
The post-heating controlled by ECU begins its operation after engine start The time for pre-heating is controlled by the ECU. -
The time for post-heating controlled by the ECU starts from engine start. This improves the idling
conditions and reduces the emission and noise. -
2) System Check
Glow Plug
Forced Shut-off of Relay
Check for short in each glow plug
Check for open due to over-voltage in each glow plug
Check for open to ground in glow plug -
-
-
When the glow plug circuit is open to ground. -
1) Operation
Pre-
heatingCoolant
temperature
Operating time 31s 22s 19s 17s 14s 0s 0s
Operating
conditions- IGN: ON
- B+: below 15.2 VStop
conditions- Time-out
- IGN: OFF
- when engine cranking
Post-
heatingCoolant
temperature
Operating time 115s 80s 30s 19s 11s 11s 0s
Operating
conditions- after engine start Stop
conditions-Time-out
- Torque: 190/170Nm
- rpm: 2100/2050

K-Line Communication
ECU starts to communicate by sending the result to pre-glow timer relay through K-Line.
Pre-glow timer relay sends the message with self-diagnosis data for glow plug to ECU.
The glow plug responses only for request.
ECU starts self-diagnosis operation from 2 seconds after power input.
Communication error occurs when: -
-
-
-
-
No response from pre-glow module for a certain period of time
Checksum error
Insufficient byte
3) DTC
DTC Description Error
P1678 GCU circuit is open GCU circuit is open
P1679 GCU circuit is short GCU circuit is short
P1680 GCU circuit is short to ground GCU circuit is short to ground
P1676Communication error Communication error between ECU and
GCU
P1677Defective GCU Communication error between ECU and
GCU
P0671 GCU channel 3 opened circuit GCU channel 3 circuit is open
P0672 GCU channel 4 opened circuit GCU channel 4 circuit is open
P0674 GCU channel 1 opened circuit GCU channel 1 circuit is open
P0675 GCU channel 2 opened circuit GCU channel 2 circuit is open

8510-23
1. SYSTEM DESCRIPTION
1) System Description
The cruise control is an automatic speed control system that maintains a desired driving speed without
using the accelerator pedal.
The vehicle speed must be greater than 38 km/h to engage the cruise control. This feature is especially
useful for motorway driving.
The cruise control system is a supplementary system, which helps the driver to drive the vehicle at a
desired speed without using the accelerator pedal under the traffic condition where the vehicle-to-
vehicle distance meets the legal requirement.

2) Traffic Conditions for Using Cruise Control
Use the cruise control system only when the traffic is not jammed, driving on motorways or highways
where there is no sudden change in the driving condition due to traffic lights, pedestrian, etc.
Improper use of the cruise control could be dangerous.
- Do not use on winding roadsyy .
- Do not use in heavy traffic.
- Do not use on slippery, wet roads.
This could result in a loss of control, collision, and/or personal injuries.

8510-23
2. CONFIGURATION
1) Circuit Diagram
The engine ECU detects the operating conditions of cruise control system, and monitors the braking
performance, vehicle speed, road conditions and ESP system operation. If the engine ECU determines
that there are not any problem to drive in cruise control mode, the vehicle can be operated by cruise
switch signals (decelerating, accelerating, cruising).