1 

Engine 

No. 001 Engine shuts off abnormally when driving   

Malfunction Cause 

Solution 

Check the injection volume and the atomization of the injector, whether they are 
normal, clean or replace the injector when necessary. 

Low fuel pressure or 

injector blockage 

Check fuel pressure. When idling the value shall correspond to 265~304 kPa, when 
accelerating the value shall increase approximately 50 kPa. If fuel pressure is too 
low, check fuel pressure controller, electric fuel pump and fuel filter etc. 

Improper ignition 

timing, engine shuts 

off sometimes 

Check engine ignition timing. When idling, the ignition advance angle shall be 
10~12°. Otherwise, shall adjust engine initial advance angle. When accelerating, 
the ignition advance angle shall over 20~30°, automatically adjusted. Otherwise, 
shall replace ECU or maintain ignition controlling system. 

Check valve clearance, whether it is too small. When heating, the clearance of air 
intake and exhaust valve shall be 0.20±0.05mm, otherwise, adjust it to prescribed 
value according to maintenance manual. 

Valve clearance too 

small or throttle body 

too dirty 

Check throttle body, whether it is too dirty. Clean throttle body and idle speed 
controller when necessary. 

Fuel quality problem 

When applying poor quality fuel, the fuel pipe must be cleaned then replace 
standard gasoline, 93# or above. 

Spark plug 

malfunction 

Check spark plug resistance, whether the value is 5~8KΩ, as well as the clearance, 
whether the value is 0.8~1.0mm. Otherwise, shall adjust or replace them. 

Ignition coil 

malfunction 

Check ignition coil, the initial winding shall be 0.4~0.6Ω, and the 2

nd

 winding shall be 

11~15Ω. Otherwise, shall replace ignition coil. 

Spark plug wire 

If there is short or open circuit in spark plug wire, then shall replace it. 

Idle speed control 

valve or stepper motor 

malfunction 

When stuck, shall clean or replace it. 

Fuel pump relay burnt 

Check the relay by multimeter, whether it is connected, as well as the coil 
resistance, whether the value is 75~90Ω. Replace when necessary. 

Valve gumming 

Determine whether it is valve gumming, according to local and gasoline using 
condition. Generally, the malfunction appears in cold condition, and will disappear 
after vehicle heated. It is recommended that driver shall clean engine without 
components removing, meanwhile, replace qualified gasoline. 

ECU harness pin poor 

contact 

Check ECU, whether it is poor contact, which results signal deviation when idling, 
as well as abnormal shut-off. Fasten wire connector again, when necessary. 

Three way catalytic 

converter damaged or 

blocked 

Check three way catalytic converter, whether it is free-flowing, as well as the 
housing, whether there is collision mark. Replace the converter assembly when 
necessary. 

Pressure temperature 

sensor malfunction 

Temperature sensor part (pin disconnected) pin 1# and 2#: the rated resistance at 
20  is 2.5KΩ±5%, and the value shall decrease when temperature raising. 

℃

Pressure sensor part (pin connected): black pen connects to earth; red pen 
connects with pin 3# and 4# respectively. In idle condition, the reference voltage on 
pin 3# shall be 5V, and the voltage on pin 4# shall be approximately 1.3V 
(determined by vehicle). If the value abnormal, then the pressure temperature 
sensor is damaged and shall be replaced. 

Poor ECU signal 

Check main ECU wire harness connectors, whether they are fixed, as well as poor 
connecting caused by rust and oxidation. Clean and fix it when necessary. Load 
data stream by K61 detector, and check the display value of ECU, whether it 
coordinates to the standard. Replace ECU when necessary. 

Engine shuts 

off in normal 

driving, such 

as geared 

driving or 
cornering 

Insufficient engine 

cylinder pressure 

Check engine compression ratio and pressure, whether they are corresponding with 
the standard value:   
479Q 9.3: 1/1250kpa/250r/min; 479QA 9.8: 1/1440kpa/250r/min; 481Q9.4: 
1/1360kpa/250r/min; JI376QE9.5: 1/1225kpa/350r/min; JL378QE 9.5: 1 / 
1225kpa/350r/min; audit and maintain engine when necessary. 

 

 
 

 

 

2 

 

 

Engine shuts off abnormally when driving 

Spark plug, ignition coil, spark plug wire 

malfunction 

Replace 

Improper ignition timing 

Valve clearance too small or throttle body too dirty 

Fuel quality problem 

Three way catalytic converter damaged or 

blocked 

Fuel pump relay burnt 

Pressure temperature sensor failure 

Poor ECU signal 

Valve gumming 

Idle speed control valve or stepper motor 

malfunction 

Low fuel pressure or injector blockage 

Inssuficient engine cylinder pressure 

Adjust 

Adjust and clean 

Replace 

Replace 

Replace 

Replace 

Replace 

Mainatain 

Clean or replace 

Check or replace 

Check engine 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Burnt 

Abnormal 

Abnormal 

Too low or bocked 

Abnormal 

Abnormal 

Abnormal 

Improper 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

 
 

 

 

3 

 

No. 002 Engine surging 

Malfunction Cause 

Solution 

Fuel fliter blockage 

Check fuel filter, whether it is blocked, and replace it when necessary. 

Charcoal canister 

Check charcoal canister, whether it contains gasoline, replace it if gasoline 
contains.  

Fuel injector blockage or 

poor atomized 

Check the injection volume and atomization of injector, if they are abnormal, 
then shall clean and replace injector assembly. 

Low fuel pressure 

Check fuel pressure, when idling, the pressure shall be in accordance with 
regular value, 265~304kPa, and shall increase about 50kPa when 
accelerating. If fuel pressure is too low, shall check fuel pressure controller, 
electric fuel pump and etc. 

Air intake system leakage 

Test the actual pressure of manifold, whether it is in accordance with 
standard.  
Check intake manifold gasket whether it is damaged, as well as the gasket 
between intake manifold and throttle.   
Check the cylinder gasket, whether it is bent and damaged.   
Check all hoses whether they are ageing and broken. 

Poor ignition 

Check spark plug applying condition, whether it operates well.   
Check cylinder wire, whether there is short or open circuit.   
Check the operating condition of ignition coil and distributor.   
Check the connecting condition between ignition control and ECU. 

Idle motor malfunction 

Check idle motor, whether it is too dirty or stuck, clean or replace it when 
necessary. Load data stream to confirm idle operation parameter status. 

Small valve clearance 

Check valve clearance: on 4-cylinder engine, the clearance of intake valve 
shall be 0.20±0.05 mm, exhaust valve 0.30±0.05mm. On 3-cylinder engine, 
the clearance of intake / exhaust valve shall be 0.20±0.05mm when heating, 
0.12±0.04mm in cold condition. Otherwise, shall adjust it. 

Improper ignition time 

Check ignition advance angle, whether it is normal. In idle condition: on 
4-cylinder engine, the advance angle shall be 10°~12° before top dead 
center. on 3-cylinder engine, the advance angle shall be 12°±3.75° before top 
dead center. Otherwise, shall adjust it. 

Tachometer 
large vibrates 
when engine 
surging  

Engine mechanical parts 

Check exhaust system, whether it is blocked or damaged. Check timing, 
whether it is misaligned. Check valve spring, whether it is damaged. Check 
camshaft, cylinder head and piston, whether they are malfunction. Check 
cylinder pressure, whether it is in normal condition. 

 

 
 

 

 

4 

 

 

Engine surging 

Fuel fliter blockage 

Blocked 

Check the injector whether it is blocked or poor 

atomized 

Clean or replace 

Clean or replace 

Low fuel pressure 

Intake system leaking 

Poor ignition 

Charcoal canister 

Engine valve clearance 

Engine ignition timing 

Idle motor 

Engine mechanical parts 

Maintain 

Maintain 

Maintain or replace 

Adjust 

Adjust 

Check 

Clean or replace 

Replace 

Poor 

Low 

Leak 

Poor 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal