Chery A15. Manual - part 259

Tips: All the following judgments are based on the normal operation of the vehicle, wire 
harness and other system components. 

 Detached vacuum regulator valve 
 Polluted adjustor filter 
 Damaged seal 
 Damaged pressure regulator (bad modulation or fuel leakage into the vacuum pipe) 

 
Five. Spray nozzle 
1. Functions and principles: 
The spray nozzle is an electromagnetic switch. Both wire leads of the coil are connected 
to the ECM and the power source through the wire harness; the coil, subject to ECM 
control, will produce magnetism against the spring, fuel load and vacuum suction of the 
manifold to suck the iron core. Then the fuel will go through the valve hole sealing 
surface integrated with the iron core and be sprayed in haze into the throttle; when the 
power is cut off, the magnetism disappears and the spray nozzle closes.  
There is a reliable rubber seal where the injector tip is connected with the fuel rail and 
where the injector bottom is connected with the engine intake manifold.  
Wiring terminal: 1- +12V 
 

      2 – ECM 

 
 

Second cylinder injector 

First cylinder injector

Fourth cylinder injector Third cylinder injector 

 
 
 
 
 
 
 
 
 
 
 

 

 
 
 

 

 
Fixing: it is fixed onto the air intake manifold through the fuel rail. 
2. Component parameters 
Working temperature: -40 ℃～130 ℃ 
Minimum working voltage: 4.5V 
Coil resistance: 12.0±0.4Ω 
3. Fault diagnosis 
Tips: All the following judgments are based on 
the normal operation of the vehicle, wire harness 
and other system components. 
The faults are discovered by the system and 
displayed on the diagnostic instrument. 
Blocked by foreign matters;  
Gelation of fuel after evaporation;  
Damaged seal that results in fuel or air leakage; 
Detached fittings or damaged wire harness or its own damage; 
Incorrect cleaning (long-term electrification) causes leakage in spray nozzle.  
 
 
Six. Fuel filter and fuel pipeline 
1. Functions and principles 
Fuel filter 
- The function of the fuel filter is to filter the solid foreign matters in the fuel; 
- In order to ensure the filtering efficacy and avoid blocked spray nozzle, a special 
electronic injection fuel filter shall be adopted for the system;  
- The filter casing shall be strong enough, or it will break up subject to fuel pressure.  
Fuel pipe 
The fuel’s working pressure is about 250 – 350kPa. For the sake of safety, the fuel pipe 
must be oil-resistant and feature sufficient safety factor against voltage.  
Fixing: the fuel filter is connected in series onto the pipeline between the fuel pump and 
fuel rail (to be connected with fuel pipes).  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 
 
 
 
 
 
 
 
 
2. Fault diagnosis 
Tips: All the following judgments are based on the normal operation of the vehicle, wire 
harness and other system components. 
Blocked filter and insufficient fuel pressure 
 
Seven. Basic checking of the system 
1. Basic structure of the fuel system 
 
 
 
 
 
 
 
 
 
 
 
 
 

 油箱

 

进油

回油

油泵

发动机真空

油压快速检查接头

喷油嘴

油轨

进油压力调节器

碳罐

回油压力调节器

Fuel inlet, return fuel, charcoal canister, fuel pump, fuel tank, return fuel pressure 
regulator, pressure gauge tie-in, spray nozzle, fuel rail, inlet fuel pressure regulator, 
engine vacuum 
 
2. Fuel pipeline maintenance 
Regularly replace gasoline filter; 
Clean the fuel tank, fuel pump, fuel pump strainer, pipeline, fuel pressure regulator and 
strainer; 
Regularly clean the spray nozzle;  
Check the sealing of the fuel tank.  
3. Check the fuel circuit 
Appearance check: check if the fuel circuit suffers any leakage, check for fuel pipe or 
fuel tank deformation and if the fuel tank cover can be normally opened and closed.  
Check the basic gasoline pressure: run the engine at idle speed, turn on the ignition 
switch, straddle the fuel pump and connect the pressure gauge to measure the fuel 
pressure which shall be 250 – 300KPA.  
 

 

 
Check the maximum fuel pressure: after measuring the basic fuel pressure, tie adhesive 
tapes onto a pair of pliers, clamp the fuel return pipe and measure the gasoline pressure 
which shall be over 600KPA.  
Pressure relief test: after engine flameout, the gasoline pressure shall be reduced by half 
within half an hour.  
Check the adjusting fuel pressure: run the engine at idle speed and pull out the vacuum 
pipe of the inlet fuel adjustor; the gasoline pressure shall increase by around 50KPA.  
Check the fuel pump current: turn on the ignition switch, pull out the fuel pump relay 
(located near the windscreen wiper motor) and connect an amperemeter to Terminals 30 
and 87 of the relay seat; the measured fuel pump current shall be 5-8A.  
Clean and test the spray nozzle: clean the spray nozzle (clean for not more than 5 
minutes each time), set the spray nozzle angles on the test table to 30 degrees (four spray 
nozzles) and align the fuel spray centerline with the spray nozzle axes; the sprayed fuel 
shall be evenly distributed with no apparent fuel drops and the fuel flow into each 
cylinder shall be normal and the same (as the spray nozzle test table in different 
maintenance stations may be different in model, the normal fuel flow shall be tested with 
a normal spray nozzle and recorded for reference).