Chery A15. Manual - part 257

 
 
 
 
 
 
 
 
 
 
 
 
2. Component parameters: 
Valve hole diameter: 

Φ38 mm 

Idle speed valve hole diameter: 

Φ10 mm 

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

 The valve and idle speed valve hole are partially blocked by oil dirt and shall be 

cleaned regularly;  

 Poor adjustment of the throttle pull rod  
 Poor adjustment of the throttle limit screws 
 Throttle scratches or worn-out shaft 

 
 
Three. Idle speed control valve 
1. Functions and principles 
The function of idle speed control valve is to control the flow area of the bypass to the 
throttle body to adjust the air inflow into the engine and thusly control the engine idle 
speed.  
 
 
 
 
 
 
 
 
 
 
 
 
 
空气：Air  怠速控制阀：Idle speed control valve 
节流阀体：Throttle body 

 

 
 
The main component of the idle speed control valve is one stepping motor. The ECM 
controls the advance/backup displacement of the valve by way of numeric square waves.  
 
 
Wiring terminals: A: coil B – 
 

       B: coil B + 

 

       C: coil A – 

 

       D: coil A + 

Fixing: throttle body or air intake manifold 
2. Component parameters:  
Coil resistance: 53

Ω ±10％ 

Coil inductance: 33mH 

±20％ 

Working voltage: 7.5～12V 
Ultimate voltage: 3.5～14V 
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 valve hole 
•  Wrong fittings between valve wiring terminals and ECM wiring terminals in the 

wire harness; 

•  Wrong ECM normal power supply 

•  No initialization of the computer (see the chapter on maintenance). 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 
 

Section Four. Ignition System 

 
One. General description 
1. Functions and principles 
The function of the ignition system is to ignite the air and fuel mixture in the engine 
cylinder at the right time as per the instructions given by the engine control module.  
Grouped ignition is adopted for the system. The engine’s four cylinders are divided into 
the two groups of 1-4 and 2-3 which are independently controlled for ignition. The 
ignition timing and coil driving are completed by the ECM.  
 
 
 
 
 
 
 
 
 
 
 
2. Ignition system structure 

点火线圈

火花塞引线

火花塞

点火系统

 
Ignition system 
Ignition coil, Spark plug wire, Spark plug 
 
Two. Ignition coil 
1. Functions and principles 
The ignition coil assembly consists of two coils, each of which provides the ignition 
energy for the cylinder spark plugs at 360 degrees of crank angle. The ignition is actuated 
when the piston reaches the upper limits of compression and exhaust; as the cylinder near 
the exhaust upper limit has low internal pressure and high temperature, only some 
ignition energy will penetrate the spark plug electrode, which is called additional ignition; 
while the cylinder near the upper limit of compression has an air mixture of relatively 
high density and pressure, so bigger ignition energy is needed to ignite the spark plug of 
the cylinder. The air mixture is rapidly ignited to give out power. The ignition of this 
cylinder is called effective ignition.  

 

 
 
Fixing: the ignition coil is fixed above the engine valve chamber cover. Pay attention to 
the shielding against wireless interference.  
 
 
2. Component parameters:  
Primary resistance: 0.6

±0.05 Ω 

Secondary resistance:  1200

±400 KΩ 

Primary inductance:  2.75

±0.25 mH 

Secondary inductance:  17.5

±1.2 H 

Voltage range: 6～16 V 
Primary charging time: 2.55 mS 
Primary inductance peak current: 9.5 A 
Primary output voltage: 34  kV 
Minimum Zener energy：30 mJ 
Minimum ignition time: 0.8 mS 
Secondary peak current: 97 mA 
Wiring terminals: 1 - 2-3 cylinder drive, 
2 - +12V, 3 – 1-4 cylinder drive; 
 
 
2. 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. Spark 
plug wire leads are detached.  
 
Three. Spark plug 
The function of the spark plug is to ignite the 
combustible gas in the engine cylinder;  
In order to reduce the wireless interference 
and protect the ignition coil drive during 
ignition, the spark plug shall be of a resistance 
type;  
In order to guarantee the energy release from 
the ignition coil, the spark plug clearance shall 
be adjusted to 1.0 – 1.2mm;