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