![background image](http://html1.mh-extra.com/html/daelim/daystar-vl125e/daystar-vl125e_service-manual_3160189071.webp)
5-28
EMS(Engine Management System)
CHECKING FOR A FAULT CODE BY OXYGEN(O
2
)SENSOR HEATER
If the voltage value is abnormal,
Check to see if the ECU coupler is loose or if there is bad contact.
Check the ‘B/B’’ electric wire, ‘G/W’ electric wire to see if they have been
broken or have short- circuited.
5) If the voltage value is normal, turn off the ignition key.
Measure the Resistance of oxygen (O2) Sensor heater : about 9[
], about 22
Measuring terminal (side of wire-harness) :
oxygen(O2)3 terminal of sensor coupler
(B/BR : BLACK/BROWN) ~
ECU No.34(G/W :GREEN/WHITE)
Remarks : Measuring unit of Resistance : Resistance ‘R’[
]
6) If the measured resistance is abnormal,
Replace the oxygen(O2)sensor with new one and recheck it.
If the measured resistance is normal,
Check the ‘B/B’’ electric wire, ‘G/W’ electric wire to see if they have been
broken or have short- circuited.
If the electric wire is no problem, the ECU is broken.
Replace the ECU with new one, and recheck it.
CHECKING FOR A FAULT CODE BY OXYGEN(O
2
)SENSOR LAMBDA SIGNAL
1) Turn off the ignition key
2) Check the O2(oxygen) coupler is loose, or bad.
If there is no defect, measure the input voltage of O2(oxygen)
3) The wire-harness to checck the ECU is connected to the ECU with a coupler.
refer to the ECU assembly/disassembly (4-34)
4) Turn on the ignition key
5) Measure the oxygen(O2)sensor voltage of wire harness to check ECU.
Measuring terminal:
ECU No.12(V :VIOLET)~
ECU No.2(V/B:VIOLET/BLACK)
Output voltage of oxygen(O2) sensor : 0.1~0.8[V]
Remark : Measuring unit of voltage : Voltage[V]
Assembly of oxygen(O2)sensor : 4.08 ~ 6.12[kgf
If the measured voltage is normal,
Check the ‘B/R’ electric wire, ‘V’ electric wire, ‘V/B’ electric wire to see if they have been broken or
have short- circuited if there is a bad contact of terminal No. 2, No. 12 of ECU coupler.
If there is no problem in wires, ECU is broken.
Replace the ECU with new one, and recheck it.
If the measured voltage is abnormal,
Check the ‘V’ electric wire, ‘V/B’ electric wire, ‘W/B’ electric wire to see if they have been
broken or have short- circuited.
6) After fault repaired, To erase the memorized fault code in the ECU is refer to how to remove the fault code(5-10)
Summary of Contents for DAYSTAR VL125E
Page 12: ...1 11 General Information...
Page 13: ...1 12 General Information...
Page 14: ...1 13 General Information...
Page 15: ...MEMO...
Page 23: ...MEMO...
Page 39: ...Fuel System 4 0...
Page 91: ...MEMO...
Page 96: ...MEMO...
Page 97: ...7 0 Clutch Gearshift...
Page 110: ...MEMO...
Page 111: ...8 0 A C Generator Starter Clutch...
Page 120: ...MEMO...
Page 121: ...9 0 Cylinder Head Valve...
Page 138: ...MEMO...
Page 139: ...10 0 Cylinder Piston...
Page 147: ...11 0 Crank Case Transmission Crankshaft 1 2kgf m 12N m 1 1kgf m 11N m...
Page 159: ...12 0 MEMO...
Page 166: ...13 5 MEMO...
Page 167: ...14 0 Front Wheel Front Fork Steering...
Page 189: ...15 0 Rear Wheel Rear Brake Suspension...
Page 201: ...16 0 Hydraulic Brake...
Page 213: ...17 0 Charging System Battery Regulator Rectifier Fuse Battery AC Generator...
Page 221: ...18 0 Ignition System A C Generator Spark Plug Ignition Coil ECU...
Page 226: ...18 5 Ignition System...
Page 227: ...18 6 MEMO...
Page 228: ...19 0 Electric Starter Starter Motor Battery Starter Magnetic Switch...
Page 235: ...MEMO...
Page 236: ...20 0 SERVICE Lights Switches Horn...
Page 247: ...MEMO...
Page 248: ...21 1 Wiring Diagram 21 Wiring Diagram...
Page 249: ...21 2...