DAELIM Daystar VL125E Service Manual page 59

EMS(Engine Management System)
Checking of the intake pressure sensor
1) If voltage value is normal, turn off the ignition key.
Connect the MAPAT(intake pressure sensor + intake temperature sensor) coupler
2) The wire-harness to check the ECU is connected with the ECU with a wire-harness coupler.
Refer to how to assemble or disassemble the ECU ( 5-32 )
3) Turn on the ignition key. Start engine and operate idle.
4) Measure the voltage of intake pressure sensor for ECU check.
Measuring the voltage of intake pressure sensor.
Measuring terminal :
Measuring voltage : 0.1[V] ~ 4.8[V]
Remarks : Measuring unit of voltage : Voltage [V]
The voltage of air pressure;
20[kPa]: 0.719 ~ 0.859[V]
107[kPa]: 4.154 ~ 4.294[V]
5) If the measured voltage is not normal,
Check the 'P' electric wire, 'P/G' electric wire, 'P /L' electric wire to see if they have been broken
or have short- circuited.
Replace the MAPAT sensor with the new one and it rechecks.
If measuring voltage is normal,
Check the 'P' electric wire, 'P/G' electric wire, 'P/L' electric wire to see if they have been broken or have
short- circuited if there is a bad contact.
badness of terminal No. 3, No. 26, No.27 of ECU coupler.
If the electric wire is no problem, ECU is broken.
Replace the ECU with the new one, it rechecks.
6) After repaired, refer to the fault code removal method to erase the memorized fault code in the ECU.
Checking of the intake temperature sensor
1) If voltage value is normal, turn off ignition key.
2) Disassemble the MAPAT coupler and measure the resistance of intake temperature sensor.
Resistance of intake pressure sensor : 2000±100[Ω], 25±1
Measuring terminal : ECU No. 28(P/B :PINK/BLUE) ~ ECU No. 3(P/G : PINK/GROUND)
Remarks : Measuring value for resistance : Resistance[
The Voltage of air pressure;
24 ~ 26[ ] : 1800~2200[ ]
99 ~ 101[ ] : 161~206[ ]
3) If measuring resistance is not normal,
Replace the MAPAT sensor with new one and it rechecks.
If the measured voltage is normal,
Check the 'P' electric wire, 'P/G' electric wire, 'P/L' electric wire to see if they have been broken or have
short- circuited if there is a bad contact of terminal No. 3, No. 26, No. 28 of ECU coupler.
If the electric wire is no problem, ECU is broken.
Replace the ECU with the new one, it rechecks.
5-16
ECU No. 27(P/L:PINK/BLUE) ~ ECU No.3(P/G : PINK/GREEN)
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