Chery A11. Manual - part 172

 

Maintenance Manual for Chery·Windcloud 

MOTOROLA EFI System

 

sensor 

2d Crankshaft 

position 

sensor 

First 

Lit  First tooth error 

Resynchronization 

2431 

2f Crankshaft  position 

sensor 

Miss 

Lit  Missing tooth error 

Resynchronization 

4431 

51 

Idle speed stepper motor Short 

 

Stepper motor short circuit Nil 

2122 

58 

Fuel pump 

Short 

Lit  Short circuit occurs in fuel

pump to ground 

Nil 1322 

59 

Fuel pump 

Open 

Lit  /Fuel pump open circuit 

Nil 

2322 

5a 

Fuel pump 

Short 

Lit  Short circuit occurs in fuel

pump to power 

Nil 3322 

5d 

Calibration area storage   

Lit   

If its value is 5e and 5d, do not 
restart 

2422 

5e 

Calibration area storage   

Lit   

If its value is 5e and 5d, do not 
restart 

4422 

61 Self-adaptation  area 

storage 

Adapt 
Checksu
m 

Lit Self-adaptation checksum 

error 

Reinitialization 2132 

64  Air conditioning output  Short 

 

Short circuit occurs in air 
conditioning signal to 
ground 

Nil 1232 

65 

Air conditioning output  Open 

 

Air  conditioning  signal 
open circuit 

Nil 2232 

66  Air conditioning output  Short 

 

Short circuit occurs in air 
conditioning signal to 
power 

Nil 3232 

6c 

Fuel injection system 

Hi/Lo 

 

Fuel injection out-of-limit Control 

1432 

6d 

Fuel injection system 

Hi 

 

Excessive  fuel injection 
self-adaptation value 

Control 2432 

6E 

Fuel injection system 

Low 

 

Too  low  fuel injection 
self-adaptation value 

Control 3432 

70 Serial  communication 

port 

Short 

  Short circuit occurs in 

serial line to ground 

Nil 1142 

71 Serial  communication 

port 

Open 

 

Serial line open circuit 

Nil 

2142 

71 Serial  communication 

port 

Short 

  Short circuit occurs in 

serial line to power 

Nil 3142 

74  Tachometer 

Short 

  Short circuit occurs in 

rotating speed signal to 
ground 

Nil 1242 

75 

Tachometer 

Open 

 

Rotating speed signal open 
circuit 

Nil 2242 

76  Tachometer 

Short 

  Short circuit occurs in 

rotating speed signal to 
power 

Nil 3242 

 

 

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Maintenance Manual for Chery·Windcloud 

MOTOROLA EFI System

 

3．Failure and Troubleshooting of EFI 

(1). Engine fails to start or has difficulty in starting 
No.   

Cause of failure 

Troubleshooting 

1 

Injector failure 

Use scanner to test if injector works in good order 

2 

Crankshaft rotating speed 
and position sensor 

Check crankshaft rotating speed, clearance between head of position 
sensor and top gear teeth of damping wheel with searcher, and 
check sensor line 

3 

Dual relay 

Check pin and fuse of dual relay 

4 

ECU socket 

Check if socket and ECU connect well 

5 

Idle speed control valve 

Check with scanner the performance of idle speed control valve to 
see if the connection of connector clip is in good condition 

6 

Looseness of throttle 
valve casing setscrew 

Fasten throttle valve casing setscrew 

 
（

2）Insufficient engine power 

No.   

Cause of failure 

Troubleshooting 

1 

Electric fuel pump defect 

Check and fasten connections, check electric fuel pump and replace 
when necessary 

2 

Fuel filter or pipeline 
clogging 

Check if clogging occurs in fuel filter and fuel line, if necessary, 
clean fuel line and replace fuel filter.   

 

Insufficient or unsteady 
fuel supply pressure 

Check fuel way and electric fuel pump to see if fuel injection 
pressure is within the range 

Inadequate air intake 

Check air intake line 

3 

Injector damage 

Check performance data and fuel jet of injector and replace when 
necessary 

Intake pressure sensor 
damage 

Check performance data of intake pressure sensor and replace when 
necessary 

Crankshaft rotating speed 
and position sensor 
damage 

Check performance data of crankshaft rotating speed and position 
sensor and replace when necessary 

Throttle position sensor 
damage 

Check performance data of throttle position sensor and replace 
when necessary 

4 

Ignition timing fails to 
reach optimality 

Replace ECU 

 
 
 
 
 
 
 
 
 
 

 

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Maintenance Manual for Chery·Windcloud 

MOTOROLA EFI System

 

 
（

3）Unsteady engine idle speed 

 

No. 

Cause of failure 

Troubleshooting 

Air leakage occurs 

Fasten throttle valve casing setscrew 

M

control valve 

alfunction of idle speed  Repair or replace throttle valve casing 

Throttle position sensor 

failure 

Check throttle opening and check if working parameter of 

throttle position sensor is within the specified range 

Check if throttle pull wire is installed rightly 

Pull throttle manually to see if binding occurs 

Use scanner to check throttle opening (the angle is between 2º

-14º  when throttle is shut down) 

1 

T

hr

ott

le

 v

alv

e c

as

in

g 

Abnormal throttle 

opening 

If throttle angle is normal, check to see if the contact of 

throttle position sensor socket connector is in good condition 

2 

Water temperature sensor 

failure 

Check to see if the working parameter of water temperature 

sensor is in normal range 

3 

Intake air temperature sensor 

failure 

The temperature value shown from the detector shall be in 

compliance with actual temperature value 

4 

Connecting pipeline failure 

Check if the pipeline connecting with connecting pipe on the 

throttle valve casing is correct, and pay special attention to 

crankcase bleed pipe. 

 
 
 
 
 
 

 

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Maintenance Manual for Chery·Windcloud 

MOTOROLA EFI System

 

EFI Maintenance Precautions: 

 

 

4.1 Fuel 

Unleaded premium gasoline (in conformity with SH0041 standard, lead≤ 0.005g/L) for 

vehicles shall be used with RON no less than 90 or above 90, otherwise, damage may occur 

on engine management system and three-way catalytic converter and affect emission. In 

addition, sulphur or lead may damage heated oxygen sensor.   
4.2 Start-up 
At any working condition, EFI system will provide fuel injection pulse width as appropriate. 

Therefore, throttle requires no stepping prior to/after hot start or cold start.   

It takes relatively long time for the first start-up (i.e. new vehicle or newly maintained fuel 

system), because fuel pipe needs fuel filling to appropriate pressure.   

The method of restoring fuel rail pressure after maintenance or re-filling of fuel is: to wind 

key to ON position and wait for 3 seconds, and repeat for several times. Every time when 

starting-up, fuel pump turning-on sound can be heard with about 1 second continuation.   
4.3 Idle speed 
After start-up, engine requires several minutes of idling for warming-up. Normal idle speed is 

850

±50r/min (coolant temperature ≥85°C). In case of cold engine, engine operates at a higher 

rotating speed for warming-up under the control of electronic control unit. As the ascending 

of coolant temperature, idle speed will lower down to normal rotating speed. If air 

conditioner is turned on when engine is idling, electronic control unit will increase idling 

speed for about 100 r/min.   
4.4 Stall engine 
Engine, before stalling, shall have be idling for a period of time to decrease temperature in a 

smooth way, so as to reduce thermal impact strength and benefit the extension of service life 

of operating parts of engine and three-way catalytic converter.   
4.5 Fuel circulation 
When fuel supply pressure is up to 2.5 bar, the fuel inlet/outlet pipes shall be connected well 

and fasten with clamp. When checking fuel line , in case fuel rail and fuel pipe are pulled out, 

starting engine is strictly forbidden. Otherwise, the leakage of fuel may cause fire hazard. 

Make sure to release fuel pressure first before disassembling fuel system parts.   

Pressure regulator block or fuel return pipe flow restriction will cause fuel line pressure to be 

on the high side.   
4.6 Injector 
For long-term idle vehicle, the engine shall be started every 2-3 months for 3-5 minutes to 

avoid clogging of injection nozzle. Injector shall be cleaned at least annually. The O- ring of 

injector is disposable part, which can not be reused.   
4.7 Three-way catalytic converter 
Do not remove spark plug or high voltage wire to check flashover status when ignition switch 

is ON or engine is in operation. When checking ignition status, pull out plugs of all injection 

nozzles, and then the spark plug of engine, later connect it to high voltage wire of 

corresponding cylinder, and make its threaded portion safely grounded with cylinder block, 

and then start engine to see the flashover status of spark plug. Otherwise, the catalyzer may 

be damaged easily.   

Caution: if engine is kept working, the catalytic converter will become extremely hot; in case 

maintaining such converter, make sure to wear protective gloves so as to avoid injury.   
4.8 Throttle valve adjustment 

 

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