9 

 

No. 005 Idle speed unstable or engine shut-off when opening AC or steering 

Malfunction Cause 

Solution 

Compressor or booster 
pump malfunction 

AC compressor over load (for example, coolant over filling, tube blocked, 
condenser is dirty, and etc.), belt over tensioned, compressor inner stuck, as well 
as booster pump inner rotor stuck and results over load. 

Intake system abnormal 

When intake manifold leaking, repair or replace relevant component. When valve 
clearance disalignment, adjust it. When air filter blocking, replace it. 

Oil line pressure abnormal 

Replace oil pump, when it operates abnormally. Fuel filter blocked, replace it. 
Fuel pressure controller operates abnormally, replace it. Oil pump relay poor 
contact, maintain or replace it. 

AC switch or booster 
pump oil pressure sensor 
malfunction 

When opening AC or steering, ECU doesn't receive loading signal, which results 
low idle speed and engine shut-off. Maintain or replace it. 

Idle speed controller or 
stepping mortor 
malfunction 

Check stepping motor, whether it is stuck or dirty. Clean or replace it when 
necessary. 

Injector malfunction 

When injector blocked or poor atomized, shall clean the injector, and replace it if 
necessary. 

Improper ignition timing or 
weak jump-spark power 

Check ignition timing, coil, wire and spark plug etc. and each connecting part, 
whether they are damaged. Maintain or replace them. 

ECU malfunction 

Check ECU and each connecting part, whether there are damage. 

Idle speed 
unstable or 
engine 
shut-off when 
openinig AC 
or steering 

Low engine cylinder 
pressure 

Disassemble and maintain the engine. 

 
 

 

 

10 

 

Idle speed unstable or engine shut-off when 

openinig AC or steering 

Compressor or booster pump failure 

Intake system abnormal 

Oil line pressure abnormal 

AC switch or booster pump oil pressure sensor 

malfunction 

Idle speed controller or stepping mortor malfunction 

Injector malfunction

Improper ignition timing or weak jump-spark power 

ECU malfunction 

Insufficient engine cylinder pressure 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

 Abnormal 

Replace 

Check or replace 

Check 

Replace 

Check or replace 

Check 

Clean or replace 

Clean or replace 

Adjust or replace 

 
 

 

 

11 

 

No. 006 Engine shuts off intermittently 

Malfunction Cause 

Solution 

Spark plug clearance is 
abnormal or tracking 

Adjust spark plug clearance: on 4-cylinder engine, 0.8~1.0mm. On 
3-cylinder engine, 1.0~1.1mm. Replace the plug when there is current 
leaking. 

Ignition wire tracking, short or 
open circuit 

Replace ignition wire. 

Fuel pump relay conducting 
point burnt 

Check relay conducting point, whether it is burnt. Replace it when 
necessary. 

Improper fuel pressure 

Check oil pressure and the atomization of each injector, whether they 
are normal. Check oil pump, oil pressure controller and fuel filter when 
necessary. As well as clean and replace the injector. 

Fuel pollution 

Check oil, whether it is polluted or mixed with water. 

Ignition coil malfunction 

Check ignition coil, whether it is over heat or short circuit. Measure 
primary winding, the resistance shall be 0.4~0.6Ω, and secondary 
winding, the resistance shall be 11~15kΩ. Otherwise, shall replace 
ignition coil. 

Canister oil leaking 

Check canister, whether it contains gasoline or it is blocked. Replace it 
when necessary. 

Distributor malfunction 

Replace distributor assembly. 

Exhaust system blocked 

Check 3-way catalytic converter or exhaust pipe, whether it is bent or 
blocked. Replace it when necessary. 

Improper valve clearance 
adjustment 

Check the valve clearance of each cylinder, whether the value is too 
small. Adjust it to standard value when necessary. For 4-cylinder engine, 
the intake valve clearance shall be 0.20±0.05mm, the exhaust valve 
clearance shall be 0.30±0.05mm. For 3-cylinder engine, the intake / 
exhaust valve clearance shall be 0.20±0.05mm when heating, and 
0.12±0.04mm when in cold condition. Otherwise, shall adjust the 
clearance. 

Crankcase venting device 
malfunction 

Check PCV valve, whether it is blocked or stuck. Maintain or replace it 
when necessary. 

Fuel tank inner vacuum 

Check fuel tank, whether it contains inner vacuum. Replace tank cover 
or canister electromagnetic valve when necessary. 

Oxygen sensor malfunction 

Check oxygen sensor, whether it is polluted or poisoned. Replace it 
when necessary. 

Idle speed control valve or 
stepping motor operates 
abnormal 

Check idle speed control valve or stepping motor, whether it is stuck or 
operating abnormal. Clean or replace idle speed control valve or 
stepping motor when necessary. 

Engine shuts off 
intermittently 
when running at 
idle speed 

ECU and connecting circuit 
malfunction 

Check ECU body, whether the heat condition and operating condition 
are in according with manufacturer requirements. Replace ECU 
assembly when necessary. Check engine computer wire harness 
connector, whether it is loose, fix it again when necessary. 

 

 
 

 

 

12 

 

Engine shuts off intermittently 

Improper fuel pressure 

Fuel pump relay conducting point burnt 

Idle speed control valve or stepping motor is dirty or 

stuck 

Fuel pollution 

Ignition coil malfunction

Canister oil leaking

Exhaust system blocked 

Oxygen sensor malfunction 

Improper valve clearance 

Crankcase venting device malfunction 

Fuel tank inner vacuum

Spark plug and ignition wire malfunction 

ECU and connecting circuit malfunction 

Replace 

Check or replace 

Check 

Replace 

Maintain or replace 

Check 

Replace 

Adjust 

Replace 

Replace 

Check or replace 

Check or replace 

Check or replace 

Abnormal 

Burnt 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Blocked 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal