Chery A15. Manual - part 270

 
 
 
 

Section Four. Data Analysis and Test 

 
 
Test conditions: the engine has been warmed up and is operated under the closed-loop 
control mode. Park the vehicle on the roadside and idle run the engine with no load. Shut 
off all power equipment: including A/C, ventilating fan and lights, etc.  
 
 
 
 
One. Basic specifications and standard values of the engine 
 

Item Specifications 

Fuel  
       Fuel tank capacity   

L 

       Return system 

 
55 
Fuel pressure modulator 

Fuel pump 
       Type 
       Position 

P/N 
Electricity-driven 
In the fuel tank 

Throttle body 

 Throttle diameter mm 
 Throttle position sensor 
 Idle speed control servo 

P/N 
38 
In the throttle body 
Stepping motor 

Identity number of the ECM 

 

Sensor 

Air intake manifold absolute pressure 
sensor 
Intake air temperature sensor 
Water temperature sensor 
Oxygen sensor 
Crank angle sensor 

 
Semi-conductor 
 
Thermal resistance type 
Thermal resistance type 
Zirconia 
Variable magneto resistance 

 
 
 
 
 
 
 
 
 
 
 

 

 
 
Continued 
Actuator  

Control relay type 
Spray nozzle type and quantity 
Identification mark of spray nozzle 
Cleaning control solenoid valve 

 
In the ECM. 
Single-nozzle spray x 4 
 
On/off solenoid valve 

Fuel pressure modulator 

Pressure modulation kPa 

 
250-350 

Cleaning control solenoid valve 
AFR control device (MPI system) 
Three-way catalyst transformer 

PWM  
Oxygen sensor feedback 
Honeycomb type 

Idle speed                                                  rpm
Idle speed at the time of cooling               rpm
Throttle position sensor adjusting voltage V 
Step range of idle speed control stepping 
motor                                                      Steps

880±50 
1030±50 
0.0～0.25V, 0%, ～5V, 100% 
0～160 

Intake air temperature sensor resistance     Ω
 
Water temperature sensor resistance          Ω
Oxygen sensor output voltage                   mV
 
Fuel pump pressure                                   kPa
Spray nozzle coil resistance                       Ω 
Cleaning control solenoid valve resistance Ω

82.13±3.17Ω (at 128℃) 
181.10±7.50Ω (at 28℃) 
82.13±3.17Ω (at 128℃) 
Output voltage at 370℃ 
800 (high)←→200 (low) 
350 
13±5 
25±5 

Air intake manifold absolute pressure sensor 
voltage                                                         V 
 
Crank angle sensor output voltage            mV

0.122～0.382 (at 15kPa) 
1.521～1.683 (at 40kPa) 
4.438～4.600 (at 94kPa) 
4.859～5.043 (at 102kPa) 
At a speed of 60rpm, the minimum peak 
voltage is 600mV. 

 
Continued 
Ignition module working temperature range ℃
Throttle body working temperature range     ℃

-40～125 
-40～125 

 
 
 
 
 
 
 
 

 

 
 
Two. Engine data analysis 
The analysis of engine data is done by the diagnostic instrument.  
1. Regular checking 
All wire harness fittings are reliably fastened in place; 
Fuel circuit and vacuum pipeline are reliably fastened; 
Screw on the bolts of the oxygen sensor and three-way catalyst to ensure the sealing of 
the fittings; check the exhaust system at 1.3 atmospheric pressure if necessary, which 
shall show no apparent leakage. 
2. System initialization setup 

 Engine management system initialization: turn on the ignition switch and shut off 3 

seconds later. The initialization setup will be completed in 10 seconds.  

 Fuel supply system initialization: turn on the ignition switch and shut off 3 seconds 

later. Restart 1 second later. Repeat for five times and the fuel supply system 
initialization setup will be completed.  

3. System and vehicle status checking 
1) Step 1: cool down the vehicle, turn on the key switch and do not run the engine (about 
30s).  

 

Items for checking 

 

1 

Troubleshooting code display  No 

2 

Engine fault indicator light 

On 

3 

Storage battery voltage 

11.5-13V 

4 

Cooling fluid temperature 
sensor 

Normal working temperature 

5 

Intake air temperature sensor  Ambient temperature 

6 

Air intake manifold absolute 
pressure sensor 

Atmospheric pressure (about: 100kPa) 

7 

Throttle position sensor 
working range 

0-99.6% 

8 

Oxygen sensor 

< 200Mv 

9 

Idle speed control valve 

40-159 steps (cooling fluid temperature: 
high-low) 

 
 
 
 
 
 
 
 
 
 
 
 
 

 

 
 
2) Step 2: turn off the key switch 

 

Items for checking 

 

1 

Idle speed motor position 

Stop at 128 steps about 8 seconds later 

2 

Is ECM power source cut off  Diagnostic instrument display disappears 

3 

Engine fault indicator light 

Off 

 
 
3) Step 3: start the engine (note: do not operate any mechanism or the throttle on the 
engine during startup) 

 

Items for checking 

 

1 

Startup time 

< 5s 

2 

Startup speed at normal 
temperature 

< 1600rpm 

3 

Engine fault indicator light 

Off 

 
4) Step 4: idle speed checking (warm up the engine to normal water temperature after 
startup) 

•  Low idle speed 

 

Items for checking 

 

1 

Engine fault indicator light 

Off 

2 

Is the troubleshooting code 
displayed 

No 

3 

Cooling fluid temperature 

80 ～ 94 

°C 

4 

Cooling fan 

Cooling fluid temperature     Cooling fan status
98 

°C                                  Low-speed fan on 

94 

°C                                  Low-speed fan off 

105

°C                                  High-speed fan on 

101

°C                                  High-speed fan off 

5 

Storage battery voltage 

13.5 ～ 14.5 V 

6 Turning 

speed 

750 

± 30 rpm 

800 

± 30 rpm (when cooling fan, headlight and 

fan are on) 

7 

Ignition advance angle 

5 ～ 13 

° 

8 

Air intake manifold pressure  35 ～ 55 kPa 

9 

Idle speed motor position 

15 ～ 30 steps 

10 

Fuel injection pulse width 

2 ～ 4 mS’ 

11 

Jumping times of the oxygen 
sensor within 10 seconds 

100 ～ 900 mV / 

≥ 6 times