41 

 

No. 024 Oil indicator is always on   

Malfunction Cause 

Solution 

Low oil quantity results low oil pressure 

Fill oil to standard level 

Low oil viscosity or oil deteriorated 

Replace required oil 

Oil pressure switch damage 

The inner conducting point of oil pressure 
switch burnt seriously and results short circuit. 
Replace oil sensing plug. 

Oil indicator circuit leads to earth partly 

The wire between oil sensing plug and grouped 
instrument partly leads to earth at front wall, 
and results oil indicator lightening constantly 
after circuit lead to earth. 

Grouped instrument inner short circuit 

Replace grouped instrument 

Low oil pressure 

Maintain oil pump and oil pipe, whether it is 
blocked. Unplug it when necessary. Check oil 
leaking condition and maintain it. 

Large engine liner clearance, which results low oil pressure 

Large clearance results oil leaking and low oil 
pressure. Normal value shall be 49kPa. 
Replace relevant component. 

Instrument 
warning 
lamp is 
always on 
after engine 
started 

Oil pipe leaking 

Maintain or replace relevant component. 

 

 

Oil indicator is always on 

Low oil quantity results low oil pressure   

Low oil viscocity or oil deteriorated 

Oil pressure switch damage 

Grouped instrumernt inner short circuit 

Oil indicator circuit leads to earth partly 

Low oil pressure 

Large engine liner clearance, which results low oil pressure 

Oil pipe leaking 

Check 

Check 

Check 

Replace 

Fill 

Replace 

Replace 

Check   

Low 

Earth lead 

Short circuit 

Damage 

Deteriorate 

Large clearance 

Leak 

Low 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

 
 

 

 

42 

 

No. 025 Water temperature is over normal value when engine running with large load   

Malfunction Cause 

Solution 

Lack of coolant fluid 

 

Fill non-standard anti-freeze fluid 

Replace standard anti-freeze fluid 

Fuel grade against requirement 

Apply specified fuel 

Low thermostat open travel 

Thermostat shall be fully opened when water temperature 
reaches 82 , otherwise, replace it.

℃

 

Water pump belt loose 

Adjust tension rate 

Radiator is too dirty inside or outside, and results 
low cooling performance, as well as water 
temperature increased. 

Clean radiator, the dirt and water mark, replace water 
tank when necessary. 

Radiator fun operates abnormal (low speed or 
fails to work sometimes) 

Maintain fan circuit and replace fan. 

Improper ignition timing 

Adjust timing 

Engine water pipe rust 

Clean rust 

Engine mixed gas is too thick 

Engine oxygen sensor damaged and results mixed gas 
viscosity misadjusted. 

Improper piston fit clearance 

Low cylinder pressure, maintain it. Low clearance often 
caused by applying non-standard piston, replace and 
reassemble with proper piston. 

Water 
temperature 
is over normal 
value when 
diving in high 
speed, and is 
normal in low 
speed. 

Cylinder bolt loose or cracked 

 

 

 
 

 

 

43 

 

Water temperature is over normal value when engine running with 

large load 

Low cooling performance of rediator 

Fan operates abnormal 

Improper piston fit clearance 

Engine mixed gas is too thick 

Low thermostat open travel 

Water pump belt loose 

Engine water pipe rust 

Fuel grade againsts requiremen 

Check 

Check and replace 

Replace 

Clean 

Check and replace 

Adjust 

Replace 

Adjust 

Poor 

Loose 

Too small 

Too thick 

Abnormal 

Rust 

Poor 

Against 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

 
 

 

 

44 

 

No. 026 Canister electromagnetic valve sounds abnormal   

Malfunction Cause 

Solution 

Canister electromagnetic valve is dirty inside 

Clean it with carburetor detergent 

Canister electromagnetic valve retaining rubber 
seat damage 

Replace canister electromagnetic valve retaining rubber 
seat and adjust the position, as far as possible with 
vehicle body 

Serious fuel tank inner vacuum 

Replace fuel tank cap 

Over adjustment of canister electromagnetic 
valve inner tube 

Adjust canister electromagnetic valve according to 
standard flow rate 

Electromagnetic 
valve sounds 
abnormal when 
idling 

Serious canister electromagnetic valve wearing 

Replace canister electromagnetic valve assembly 

 

 

Canister electromagnetic valve sounds abnormal 

Canister electromagnetic valve is dirty inside 

Canister electromagnetic valve retaining rubber seat 

damage 

Serious fuel tank inner vaccum 

Over adjustment of canister solenoid valve inner tube 

Serious canister solenoid valve wearing 

Replace 

Replace 

Adjust 

Clean and replace 

Maintain 

Damage 

Dirt 

Over normal value 

Vaccum 

Wearing 

Normal 

Normal 

Normal 

Normal