DAELIM VJF125 Service Manual - page 87

EMS(Engine Management System)

5-36

15.CHECKING OF ENGINE SPEED SIGNAL(ESS)CIRCUIT

Fault code number is displayed by MIL

CHECKING CIRCUIT

Coupler terminal is based on the side of Wire-Harness. 

CHECK PROCEDURE

1) Turn off  the ignition key .

2) Check the ESS coupler is loose, or bad.

If there is no problem, check the resistance of tachometer.

3) Check the resistance between each terminals and ground.

Measuring terminal:  B electric wire ~  EARTH, 

ECU NO. 32 (B/Y:BLACK/YELLOW) ~  EARTH

The resistance between each terminals and ground :  

∞[

] 

If the measured resistance value is abnormal, replace the part with new one.

Refer to (    ) for assembly and disassembly  

Remark : Measuring unit of voltage : Resistance [

]

4) If the measured resistance and continuity are abnormal,

.     Replace the tachometer with new one, and it rechecks.

5) If the resistance and continuity are normal, contact the tachometer coupler.

6)Turn on the ignition key. 

7) Measure the voltage or tachometer of wire harness for ECU check.

Measuring terminal: 

B electric wire ~ 

G electric wire => Output Voltage: battery voltage

Measuring terminal: ECU No. 32(B/Y: BLACK/YELLOW) ~  G electric wire =>Output voltage: 9[V]~15[V]

Measuring terminal: ECU No. 32(B/Y: BLACK/YELLOW) ~ 

G Measuring the output voltage of

electric wire, using the PVA(peak voltage adapter) multi-tester tool.

Remark : Measuring unit of voltage : Voltage[V]

If the measured voltage is normal,

Check the ‘B/Y’ electric wire, ‘B’ electric wire, ‘G’ electric wire to see 

if they have been broken or have short- circuited if there is a bad 

contact of terminal No. 32 of ECU coupler. 

If there is no problem in wires, ECU has is broken.  

Replace the ECU with new one, and recheck it.

If the measured voltage is abnormal,

Check the ‘B/Y’ electric wire, ‘B’ electric wire, ‘G’ electric wire to see if they have been

broken or have short- circuited.

8) After fault repaired, To erase the memorized fault code in the ECU is refer to how to remove the fault code(5-11)

TACHOMETER 

ECU 

32    : ESS(ENGINE SPEED SIGNAL)