Yingang YG125-30A, Maintenance Manual

Page: 139 / 153

YG125-30A Maintenance Manual Electrical starting control system
145
Major faults diagnosis
Phenomenon Possible causes Solutions

Winker indicator is out of
work

Meter dial illuminator is out
of work

Speedometer is out of work

Tachometer of generator is
out of work

The winker indicator filament is burnt
out

The meter dial illuminator filament is
burnt out

The speedometer is damaged
．

Tachometer of generator is damaged
．

Replace winker indicator bulb

Replace meter dial
illuminatorbul

Replace speed meter

Replace tachometer

There is no mileage
increasing indication upon
vehicle speed

Meter failed

Replace meter

Speedometer is out of work

Soft shaft is broken

Replace speedometer soft shaft
assembly

Engine speed indication
failure

Line poorly plugged or open circuit;

Meter failed;

ECU failed;

Re-plug or repair;

Replace meter;

Replace ECU

Fuel level indication failure:

No indication while there is
fuel;

Having indication while there
is no fuel,

Fuel sensor failed or float is blocked;

Meter failed;

Line poorly plugged, open or short
circuit.

Replace fuel sender;

Replace meter;

Re-plug or repair.

Meter backlight source
doesn’t illuminate

Line poorly plugged or open circuit;

Meter failed

Re-plug or repair;

Replace meter;
 Meter can’t communicate
with ECU;

Line poorly plugged or open circuit;

Meter failed;

ECU failed;

Re-plug or repair;

Replace meter.

Replace ECU

Turn indicator filament is
burnt out

Headlight high-beam
indicator filament is burnt
out

Line poorly plugged or open circuit;

Meter failed;

Re-plug or repair;

Replace meter;

LCD fails to switch mode

Meter failed

Replace meter

Soft shaft is broken
．
 
Replace speedometer soft shaft
assembly
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