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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
Trouble Codes
Trouble code
P1171
P1172
P1173
P1174
P1175
ENGINE CONTROL SYSTEM
DI ENG SM - 2004.4
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
> 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
• Check each injector
DI08-21
Diagnosis
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
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