SsangYong Rexton. Manual — part 92
DI08-21
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ENGINE CONTROL SYSTEM
DI ENG SM - 2004.4
MINIMUM DRIVE PULSE (MDP) LEARNING
When the pulse value that the injector starts injection is measured, it is called mininum drive pulse (MDP). Through MDP
controls, can correct pilot injections effectively. Pilot injection volume is very small, 1 ~ 2 mm/str, so precise control of
the injector can be difficult if it gets old. So there needs MDP learning to control the very small volume precisely through
learning according to getting older injectors.
Learning Conditions
Coolant temperature
Vehicle speed
Intake manifold pressure
Engine speed
Battery voltage
Fuel temperature
Initial MDP learning on each injector
> 75°C
> 50 Km/h (over 5 seconds)
> 0.7 bar
> 2,500 rpm
10 V < MDP < 16 V
0 < fuel temperature < 80 °C
5 seconds
Trouble Codes
Trouble code
P1171
P1172
P1173
P1174
P1175
Description
Fault MDP learning on injector No. 1
Fault MDP learning on injector No. 2
Fault MDP learning on injector No. 3
Fault MDP learning on injector No. 4
Fault MDP learning on injector No. 5
Diagnosis
• Check each injector
DI08-22
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ENGINE CONTROL SYSTEM
DI ENG SM - 2004.4
Accelerator Pedal Sensor
<Location of accelerator pedal sensor>
<When depressing the accelerator pedal
and brake pedal simultaneously>
Accelerator pedal sensor changes accelerator pedal position into electrical signal and then sends to ECU to let know
the driver’s demand. There are 2 sensors in the accelerator pedal sensor. Accelerator pedal No.1 (ACC 1) sensor signal
determines fuel injection volume and injection timing during driving, and accelerator pedal No. 2 (ACC 2) sensor signal
compares whether the No. 1 sensor signal value is correct.
If accelerator pedal No. 1 and 2 sensors are defective, ECU remembers defect code, and acceleration responses are
getting bad and engine rpm hardly increases.
Y220_08014
Y220_08015
Notice
When depressing the accelerator pedal and brake pedal simultaneously while driving, the acceleration response
will be diminished abruptly and cannot drive with over 70 km/h even though depressing the accelerator pedal
to its end. At this time, the trouble code of “P-1124 Accelerator pedal sensor stuck” is stored into ECU. If
depressing the accelerator pedal over 3 times, it will be resumed to normal condition.
* For detailed information, refer to “Diagnosis” section in this manual.
Signal 1
Ground
Signal 2
Ground
<Circuit diagram of Accelerator pedal sensor>
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ENGINE CONTROL SYSTEM
DI ENG SM - 2004.4
<Coolant temperature sensor>
<Output characteristics of coolant temperature
sensor>
Coolant Temperature Sensor
Coolant temperature sensor is a NTC resister that sends coolant temperature to ECU.
NTC resister has characteristics that if the engine temperature rises, the resistance lowers so the ECU detects lowering
signal voltages.
If the fuel injected into the engine through injector has more turbulence, then combusts very well. However, if engine
temperature is too low, the fuel injected as foggy state forms big compounds causing incomplete combustion. So the
sensor detects coolant temperature and changes coolant temperature changes into voltage then sends to ECU to
increase the fuel volume during cold start for better starting. And detects engine overheating for fuel volume reduction to
protect the engine.
ECU functions as below with coolant temperature sensor signals.
• When engine is cold, controls fuel volume to correct idle speed.
• When engine is overheated, controls electrical fan and A/C compressor to protect the engine.
• Sends information for emission control.
<Circuit diagram of coolant temperature sensor>
Y220_08016
Y220_08017
Temperature (°C)
20
50
80
120
NTC 1 Resistance (
Ω
Ω
Ω
Ω
Ω)
2,550
826
321
123
NTC 1 Resistance (
Ω
Ω
Ω
Ω
Ω)
6,062
1,800
638
200
Temp.
Resistance
Signal
Ground
Auto amp
DI08-24
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ENGINE CONTROL SYSTEM
DI ENG SM - 2004.4
<Boost pressure sensor>
Boost Pressure Sensor
<Location of boost pressure sensor>
Boost pressure sensor uses piezo element and uses only 3 terminals out of 6.
It sets fuel injection timing and corrects fuel injection volume according to atmospheric pressure.
The other function is determining EGR operation stops.
• Output voltage calculation
V
O
= V
S
x ( P x 0.004 - 0.04)
V
O
:
Output voltage
V
S
:
Supply voltage
P
:
Applying voltage
<Output characteristics of sensor>
Y220_08018
Y220_08019
Performance proofing pressure range
Performance proofing temperature range
Storage proofing temperature range
Performance proofing supply voltage
Max. consuming current
Responsibility
Tightening torque
20 ~ 250 KPa
- 40 ~ 110°C
- 40 ~ 125°C
4.85 ~ 5.35 V
10 mA (supply voltage at 5.35 V)
T
R
7ms
10 Nm
Not using terminals
V
oltage (V)
Pressure (bar)
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