DAELIM DAYSTAR VL125E, Service Manual

Page: 70 / 253

5-27
EMS(Engine Management System)
1) CHECKING OF OXYGEN(O
2
) SENSOR CIRCUIT
Fault code number is displayed by MIL
Fault code number is displayed by MIL of the oxygen(O
2
)sensor lambda signal.
CHECKING CIRCUIT
Coupler terminal is based on the side of Wire-Harness.
CHECKING FOR A FAULT CODE BY OXYGEN(O
2
)SENSOR HEATER
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) Disassemble the coupler of oxygen(O2)sensor and turn on ignition key
4) Measure input voltage of oxygen(O2)sensor coupler
Input voltage : Battery voltage[V]
Measuring terminal (side of Wire-harness) :
oxygen(O2)3 terminal of sensor coupler
(B/BR : BLACK/BROWN) ~ EARTH
Remarks : Measuring unit of voltage : Voltage[V]
ECU
OXYGEN SENSOR
2 : LAMBDA SENSOR GROUND
12 : OXYGEN SENSOR SIGNAL
34 : OXYGEN SENSOR HEATER