Function; Pre-Heating; K-Line Communication; Operating Time - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

DI06-32

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

Coolant Temp.
Pre-
Operating Time
heating
Operating
Conditions
Coolant Temp.
Operating Time
After-
heating
Operating
Conditions
Coolant Temp.
Glow
Operating Time
Indicator
Operating
Conditions
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
-35 °C -25 °C
31 sec 22 sec
• IG: "ON"
• B+ : below 15.2V
-30 °C -20 °C
115 sec 80 sec
• After engine starting
-30 °C -25 °C
18 sec 16 sec
• IG: "ON"
-20 °C -10 °C
19 sec 17 sec 14 sec
• After operating time elapsed
Release
Conditions
• IG: "OFF" • When engine cranking
-10 °C 0 °C 10 °C
30 sec 19 sec 11 sec
• After operating time elapsed
Release
• Torque : 190/170 Nm
Conditions
• Speed: 2100/2050 rpm
-20 °C -10 °C
10 sec 5 sec 2 sec
Release
• When engine cranking
Conditions
0 °C 10 °C 20 °C
0 sec 0 sec
20 °C 35 °C
11 sec 0 sec
0 °C 10 °C 20 °C
0 sec 0 sec
COOLING SYSTEM
DI ENG SM - 2004.4